Re: atomic position

You might like to add it to COD :-) Sure. Let me a few days to add the 50 crystal structures lacking in the Crystallography Open Database. There is some opposition in the world to attain this target and not a lot of help from the crystallographers themselves (one should ask why :-(). Arme

Re: 1-Adamantanol

not in COD, which would have make useless the demand. So, to those sending graciously their data to CSD, think also automatically to the COD ;-) Best, Armel Le Bail --- Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la protection avast! Antivirus est active

RE: X-ray diffraction laboratory manager position

Hi, Well, after >30 years in a X-ray lab, I conclude that both technicians and PhDs find more convenient to use a phone rather than a screwdriver for calling the manufacturer in case of serious dysfunctionment... Best, Armel ++ P

Re: [sdpd] Re: Are restraints as good as observations ?

cases that restraints may be admitted, and even constraints for H atoms. Not sure that your young students have received a complete formation if they have to argue "Even Armel Le Bail has to apply restraints!". Well, yes, even not ash

Re: [sdpd] Re: Are restraints as good as observations ?

All deviations from expected values (1.514 and 1.634) are within 3 e.s.u.s that are around 0.03 A in average. About absurdity, there are different sensibilities... With such a definition above, 1.72(3) instead of 1.634 is just OK for Leonid. Where would he see a limit before applying restrai

Re: [sdpd] Re: Are restraints as good as observations ?

All deviations from expected values (1.514 and 1.634) are within 3 e.s.u.s that are around 0.03 A in average. Further improvements seem possible, but it will require more time and efforts. So, one more example of underestimated information capacity of powder data and overestimated necessity

Re: [sdpd] Re: Are restraints as good as observations ?

>The problem of having jammed the wrong molecule > into a unit cell can be identified by restraints which > are violated. With rigid bodies it is more difficult to > find out what the data are trying to tell you. Is this >wrong molecule issue the problem you fear? I prefer resolving such proble

Re: Caltech survey

I tend to think that FULLPROF is the clear favorite of the magnetic scattering community, but I have no data to prove that. Interesting enough is the variation of the number of citations of this paper : RODRIGUEZCARVAJAL J RECENT ADVANCES IN MAGNETIC-STRUCTURE DETERMINATION BY NEUTRON POWDER D

RE: DBWS vs other refinement programs

Are you applying ? No such ambition. Armel

RE: DBWS vs other refinement programs

http://danse.cacr.caltech.edu/polls/results.php?sid=22 This Caltech survey is a bit strange. The Caltech experts range indexing programs in the category 'structure solution', mixed

Re: notes on rietveld method

Please tell me the name of any good book you have come across... List of books (and much more) there : http://sdpd.univ-lemans.fr/DU-SDPD/semaine-1/sdpd-1.html including : Fundamentals of Powder Diffraction and Structural Characterization of Materials Vitalij K. Pecharsky, Peter Y. Z

Open Data in Crystallography - Petition

Hello, For those asking for atomic coordinates at this mailing list. If you have difficulties in accessing the crystallography databases (CSD, ICSD, CRYSTMET, ICDD), you may consider to give your opinion by signing the petition in favour of opening the access to crystal data on the Web. Visit h

Re: fundamental parameters approach & X'celerator

Alan??? Are you listening? Bruker providing help to analyze Panalytical data ?-). Armel

Re: [sdpd] Re: DDM for academicians

P.S. The word "deposit" has additional meanings equivalent to "sediment", "sludge", "settlings", "dreg", "varnish" etc. Thanks. Just what I was meaning. The association "sludge varnish" is even more accurate ? Sediment is fine because the Academy has a strong effect of attraction and capture many

Re: DDM for academicians

I am pleased to inform you that an academic version of DDM is available now at reduced price. This version is very elaborate, sophisticated and difficult to use. It is specially designed for smart, wise and highly experienced academicians. The current academic price is 1 Russian rubles, but it

Yvon Laligant

. Since the beginning in 1999, he was one of the teachers of the SDPD Internet Course. He was a true friend, too modest and undemonstrative. He was really too young to leave us. Good bye Yvon. Armel Le Bail

Re: alpha-Na2Ca4(PO4)2SiO4

what kind of search/match software do you use? The best in the world... : EVA (Socabim/Bruker) See the Search Match Round Robin 2002: http://sdpd.univ-lemans.fr/smrr/ http://sdpd.univ-lemans.fr/smrr/results/ published : "Results and conclusions of the internet based Search/Match Round Robin 2002"

Re: alpha-Na2Ca4(PO4)2SiO4

does anyone knows the atomic positions for PDF No. 33-1229 alpha-Na2Ca4(PO4)2SiO4Space-group P-3m1 or where I can find it? I coudn't find in the ICSD database 2/2004. Producing a calculated powder pattern from 33-1229 and using a search/match software suggests that this compound is highly rel

Re: superstructure peak

To my knowledge in GSAS it's not possible to perform the structural refinement of the same phase with two kinds of profile model functions, one for sharp peaks and the other for broadened peaks (I already saw that the function n.4 by Stephens doesn't match my case). It is possible with Fullprof. I

Re: Le Bail -GSAS

>I am trying to do Le Bail fitting (GSAS) on sychrotron XRD data (capillary). >Although the peak positions fit nice the calculated intensities are >extremely low. Not sure with GSAS, but try to decrease the fixed scale factor, and the extracted intensities should increase ? Armel

CAC2

CAC2 = 2nd Algerian Congress of Crystallography, 17-21 April 2005: http://cac2.lacmom-dz.com/ Constantine - Algeria

Re: simulated annealing software?

The list of such freeware really available is short : FOX, PSSP, ESPOIR. Only FOX allows for your optional feature 4. Many links at the SDPD Internet Course sessions 7 and 8 : http://sdpd.univ-lemans.fr/DU-SDPD/semaine-7/sdpd-7.html http://sdpd.univ-lemans.fr/DU-SDPD/semaine-8/sdpd

Re: [sdpd] Derivative Difference Minimization

Enjoy the freedom from the "background headache"! Your comments and suggestions are welcome. So, this is a kind of background extraction method in a sense ?-). Not seen in the paper how to calculate the Bragg R factor or RF, nor how to obtain the"|Fobs|" in order to make a Fourier difference synth

2004 Indexing Round Robin

Hi, The results about the UPPW Round Robin 2004 and the indexing benchmarks have been published : "Renewed Interest in Powder Diffraction Data Indexing" Jörg Bergmann, Armel Le Bail, Robin Shirley and Victor Zlokazov Z. Kristallogr. 219 (2004) 783-790. Indeed, the whole 219(12)(2004

Google Scholar

Hi, It seems that Google Scholar is a big support to a more open access to the Knowledge. There is even a citation number used for ranking the documents or references May be ISI will decrease the cost of the Web of Knowledge or of the citation index after that ? Let us see... Give a try at "pow

Re: rietveld refinement

It is also true that no development has been done for anisotropy. Not yet! Well, if all previous works about trying to take account of size/strain anisotropy in the Rietveld method are nothing yet, this allows to close the discussion. Let us wait for really serious developments to come. Armel

RE: rietveld refinement

I'd have to disagree on this point - troublemaker I suppose! I've followed the work by Langford and Louer closely, and have successfully applied their techniques I do not understand on what point exactly you disagree. The cited paper about size effect in nickel hydroxyde is co-authored by D. Lo

Re: Unexpected honour

An alternative, a diversification, does not mean automatically a disidence. Let us not blurred a word very dear to people like me, rising and living most of the life in a dictatorial regime. Nowadays, the dissidence against communism is less distributed in the world. The new dissidence is against

Re: rietveld refinement

Small error, sorry, three of the possible arrangement were : |--| | |--| | | |--|--| |--|--|--|--| |--| | | |--| | |--|--| | |--|--|--|--| |--| | | |--| | | | | |--| |--| |--| |--|

Re: rietveld refinement

What we see in diffraction is the column lengths (volume & area averaged) and the classics were not full ignoring the shape and radius (radii) distribution(s). Nicolae Popa (Mister, Messieur, Don, Dom, etc.) Of course I agree with you that completely different shapes may correspond to the same dis

RE: Unexpected honour

>I have no other choice but to use ICSD if I pretend to be >an expert/wizard (=adept ??) in inorganic chemistry. Armel, that is the nicest compliment I have ever heard about ICSD. Sincerely, Thanks ! Alan xxx See how we are different. For you this is a compliment. For me "no other choice" is an in

RE: Unexpected honour

I am happy to see that you are still a member of the Rietveld list and still use ICSD, I have no other choice but to use ICSD if I pretend to be an expert/wizard (=adept ??) in inorganic chemistry. The only word defining ICSD is : monopoly. The definitions below are explicite and adequate, so that

RE: Unexpected honour

Why "dissident" Armel ? I am an adept of the open access to the knowledge, your religion looks different. Armel from http://www.dictionary.com: Disagreeing, as in opinion or belief. \Dis"si*dent\, a. [L. dissidens, -entis, p. pr. of dissidere to sit apart, to disagree; dis- + sedere to sit: cf. F

Re: rietveld refinement

The diffraction alone can not decide. Significantly different "physical" size distributions could describe equally well the peak profile (J.Appl.Cryst. v35 (2002) 338-346 - self citation too). Nicolae Popa Looking at your figures 6b1 and 6b2, I measure how we differ on the sense of "significantly

Re: rietveld refinement

It is a separate question to what extent those distributions are "physical"... Simple attempts to establish that at least the size distributions obtained from a mixture of two samples with same composition and two very different size distributions, are close to the expected result, establishing so

RE: Unexpected honour

Seriously Thanks guys I did not know about this site till I retired and have wished I knew a lot earlier. Try also the dissident SDPD Mailing List : http://groups.yahoo.com/group/sdpd/ (though Sir Kenneth is also a subscriber...). Armel

Re: Domain Size confusion

I will be grateful to all if there is a discussion on the term "Domain Size" over this list. "Domain size" is an incomplete definition. Line broadening due to size effect is related to the definition of "coherent diffracting domains". The coherency comes from the fact that the three-dimensional or

URGENT support for NIH public access policy

Date: 11 Nov 2004 01:08:04 - From: "Harold Varmus" <[EMAIL PROTECTED]> Dear Open Access Supporter, On September 3, 2004 the NIH posted for comment an "Enhanced Public Access Policy." This policy would require the recipients of NIH research grants to provide to the National Library of Medicine a

Re: instrumental correction

Hi, Few days back I have put a question on the list but has not yet replied me. I desperatly need your help. The fact is that your question has a complex answer... I have evaluated the instrumental parameters U,V,W from cagliotti relation and 'a' and 'b' from the eta relation. Can anybody tell me

Re: Mathematics

Not much money for Science in Colombia ? The ultra basic mathematics in the Rietveld method are available for free at the author himself Web site : http://home.wxs.nl/~rietv025/ In paperback, the book "The Rietveld Method" can be obtained for less than 10-40 euros : http://www.fetchbook.co.uk/compa

Re: how much is too much?

My question is: Since I am already using the constraints, therefore somewhat imposing "my solution" on the structure, can I add more complexity to the refinement, using the results of ab initio calculations, and say that this is real? As you probably know already, too much is too much... "Too m

Re: Initial background polynomial coefficient in Fullprof

I am new to Fullprof program and I would like to ask you one basic question. How do I know the initial coefficient value of background polynomial function if I set Nba=0 for my neutron powder diffraction? 1 - See the corresponding background formula 2 - see your pattern 3 - detect the angle wher

Siemens D500

Hi, Is there somewhere any cemetery of died Siemens D500 powder diffractometers where to grab for some pieces in order to try to repair a very old one (1982) ?-). Armel

Chestnut

Alan wrote: Well, that is an old chestnut that Cooper and Rollet used to oppose to Rietveld refinement. I think Rollet eventually agreed that Rietveld was the better method. Has Bill really gone back on that ? Yes, see the latest issue of J. Appl. Cryst. (2004) 37, 621-628. And there is also a book

Modesty

And he is modest as well :-) I have to be modest. According to the CNRS, I am a second-class researcher... Armel

Re: step scan increments

Can anyone indicate me how must I choice the 2theta step increment and the total experiment time of step scan DRX pattern for having a good rietveld refinment result. The step increment choice depends on the instrument resolution. Determine what is your sample minimal full width at half maximum,

RE: Anisotropic line broadening in cubic material

I suspect that the broadening may be caused by stacking faults or twinning, but how do I determine whether this is the case? There is no software in which you enter the powder data and from which the case of faulting is suggested... Many cases of faulting in simple metals or mixed-metallic compoun

RE: Rietveld refinement and PDF refinement ?

Adding 2 cents to the discussion... But I will try to convince myself otherwise :-) Another reason which may preclude your self-convincing is the fact that all the very good PDF studies of materials that are not perfectly crystallized (producing diffuse scattering), though not being amorphous, are

RE: [sdpd] XRDU:RIET: Review references for refining

>Other papers similar to the situation in the ACA 2004 abstract of >Clearfield, Bestaoui, Ouyang, Fredoueil, Bujoli appreciated. > >"Crystal Structure of Cd3(O3PC2H4CO2)2.2H2O : Influence of the Solid >State NMR in the Structure Determination" > http://www.hwi.buffalo.edu/ACA/ACA04/abstracts/text/W

PCOD and COD updates

PCOD and COD updates (a lunar Apache/PHP/MySQL application ;-) : Total in PCOD : 714 predicted structures Total in COD : 13967 entries 172 new entries in PCOD : hypothetical hexagonal zeolites http://www.crystallography.net/pcod/ Selected pictures of these new entries at : http://sdpd.univ-lemans.f

Re: Next Endeavour version without Hofmann potential

Even Armel and I have to pay to eat... And a brain works better if the stomach is not empty... So, this story may have convinced you that people working on proteins are lucky with that open PDB database, that people working on nucleic acids are lucky with that open NDB database, that people workin

Re: Next Endeavour version without Hofmann potential

"Your operating model... is a stellar example of how one might integrate with MySQL while still adhering to confines of the GPL or in other words, managing to keep your product open source". Thanks for the confirmation. Exactly what I said : advertisement for extremely good commercial products.

Re: Wykoff positions of Hopeite

Would anyone please send me the wykoff positions of Hopeite, Zn3(PO4)2. [H2O]4. Hopeite, as a mineral, can be found in the AMCSD : http://www.geo.arizona.edu/AMS/amcsd.php or in the COD : http://www.crystallography.net/ Both open databases. Armel

Re: Next Endeavour version without Hofmann potential

Hi, My initial subject line was : "Where we go with monopolistic licensed databases ? A bad example below..." It was changed automatically by the ILL mail server, replacing it by the subject of the forwarded email about Endeavour. So, if some results obtained from these monopolistic databases are n

Next Endeavour version without Hofmann potential

A bad example below... Armel == From: "Crystal Impact" <[EMAIL PROTECTED]> To: "Crystal Impact Customers" <[EMAIL PROTECTED]> Date: Tue, 6 Jul 2004 11:11:01 +0200 Dear customers, in our previous e-mail (dated June 26, 2004) we announced the next Endea

Re: indexing problem

Topas software is very good at solving such short axis problems. The advantage is that it will look at all of the peaks you feed it, instead of using just the first twenty or so to generate candidate solutions (the way that ITO and TREOR work). There is a way with McMaille to fix the cell para

Re: indexing problem

How to pick up the right solution between these high M20 solutions? No exact solution to that problem related to the "needle to be found in a hay bundle." The ultimate proof that a solution is the right one is to solve the structure. Having only 31 hkls, this is not completely impossible with an o

Re: preferential orientation

your reply about preferred orientation probabaly not being a problem with a cubic mineral is of interest to me. I can testify to have seen huge preferred orientation occuring in some cubic perovskites, at least. Too much intensity in those h00. Armel

Re: Dislocation loop and broadening

"In this case it is case it is expected that there will be formation of dislocation loops in the material due to irradiation". Well, simulations which would be made on the same material in the case of different kinds of dislocations and defaults could say if really the line-broadening is the finge

Re: Domain size confution

Can anybody tell me what do the terms area weighted domain size and volume weighted domain size physically mean. How to understand these two concepts of domain sizes physically. Bertaut and Warren considered columns of cells along a given hkl direction and defined a P(M) distribution corresponding

Re: GSAS informations

(you could be a good boxeur, Armel!), Knocked out at round 4 ! Argh ! Anyway, a sphere was good enough for the previous size-strain round robin... Hope that the next size-strain round robin will be more complex, and will succeed in excluding definitely any ellipsoid from the ring. Armel

Re: GSAS informations

He could ask the master how is the nature so perfect. Or could conclude by himself that powders are not single crystals, so that symmetry may lead to systematic overlap and irrecoverable loss of information. Yes, anisotropic line broadening is rarely observed with cubic compounds unless in very sp

Re: GSAS informations

Presume one of your students makes a fit on a sample having only size anisotropy and he is able to determine the six parameters of the ellipsoid. But after that he has a funny idea to repeat the fit changing (hkl) into equivalents (h'k'l'). He has a chance to obtain once again a good fit, with oth

Re: GSAS informations

order to model size and strain anisotropy was not "naive". It was old Science (in the sense "accepted for publication twenty years ago" ;-). Best wishes with HNbO3, Armel Le Bail

Re: GSAS informations

Hi, >The coefficients Lij in the formula you wrote have no significance. Our whole science is a so bad approximation to the Universe... For the representation of an isotropic size effect , you may imagine the mean size being the same in all directions, obtaining a sphere. The same for a mean str

Re: Crystallography Open Database

Armel, do you agree with the IUCr recommendation in the letter you cited that rich countries and individuals like you and me should pay a little more for databases and journals so that developing countries might pay less ? I do. I do not. This is not "little" more. Even in rich countries, Individ

Crystallography Open Database

IUCr have done a great job in putting ALL Acta papers on-line. They have also declined your proposal that they "contribute" data to COD and recommend that people support existing databases instead. So how about helping raise money from the French equivalent of NSF for that purpose ? There is not y

Re: ICSD database updated to 76,480 inorganic structures

And the milkmaid as well I suppose Armel ? Exactly. ICSD also contains papers from the American Mineralogist, and even provides direct links to the original paper in electronic form where that is available. (Bob Downs is working on making more back issues available on-line). The AMCSD is not l

Re: ICSD database updated to 76,480 inorganic structures

Armel will be pleased to know that the PHP-MySQL server software is available as open source (but copyright) code from http://icsd.ill.fr/icsd/install/ Not enough Alan, I want not only the butter but also the money for the butter. The complete stuff fully open. 500 more CIFs in COD that week, co

Re: gsas reflection listings

Sorry if I recall what has been discussed before, but I cannot find it in the archives. I don't use apparantly the proper search terms. Try this in the old archive (90 emails !) : http://sdpd.univ-lemans.fr/cgi-bin/searchrietveld.pl?Range=All&Format=Standard&Terms=bail+gsas or this in the new arch

Re: Philosophical vein

Hi, The Siena School webpage states: "The aim of the school is to have the crystallographic computing experts of the present, help train and inspire a new generation of experts in crystallographic computing." I am of the past, not sure of being an expert even about past things, not sure of b

Philosophical vein

"What happens in the future?" When Bob Von Dreele and Brian Toby, to name two, join Al Larson in retirement, (and Al finally stops working) what happens then? My structure prediction software has not yet any subroutine able to give an answer. But I believe a lot in the Open Access current. In la

Re: Is it really preferred orientation problem?

> Like Rp, Rwp, Chi2, RB are respectively from 3.96, 5.33, 2.68, 5.80 > to 3.35, 4.42, 1.85, 3.07. This should pass a test of statistical significance. The preferred orientation (PO) problem is recurrent at the rietveld_l. This is normal since PO is one o

ESCA 9 - First announcement

The Ninth International Workshop of Crystallography organized by the Egyptian Society of Crystallography and its Applications (ESCA), entitled : "Recent Advances in X-Ray Powder Diffraction" is planned 27 November - 2 December 2004, Assiut, Egypt See the first announcemen

Re: CIF to powder pattern

Hi, >Have you had any response to your query? I also need to translate a CIF >file to hkl, d space and intensities. Thank you. No answer corresponding to a complete program doing directly the job. I received advice to use XTAL : http://xtal.sourceforge.net/ or/and CIFTBX : http://www.bernstein-p

RE: Re: thermal parameters at low temperature

If you type "absorption" (or absorbtion :-) into the search field of the Rietveld archive http://www.mail-archive.com/[EMAIL PROTECTED]/ you will find an earlier discussion on this. And also ~60 emails with the "absor(p/b)tion" keyword in the old Rietveld 1994-1998 archive : http://sdpd.univ-lem

CIF to powder pattern

Hi, Searching for an open source FORTRAN program translating series of CIF files into a seies of lists of hkl, d spacings and intensities. Thanks, Armel

Bazhenovite

? Thanks a lot, Armel Le Bail http://www.cristal.org/course/

Re: Combined Rietveld Analysisof XRD and Neutron with Fullprof

>Has anyone available any pcr file appropriate for this process? See the pbb.pcr file in the list of examples delivered with the latest Fullprof : pbb : multi-pattern input file, mixing X-rays and neutrons : pbso4.dat data for a combined refinement

Re: Bond lengths calculation by Fullprof

E program, available at the same place as Fullprof by anonymous FTP : charybde.saclay.cea.fr/pub/divers/fullp/ms-dos/ Best, Armel Le Bail http://sdpd.univ-lemans.fr/course/

Re: Minerals with unknown structure (>300)

unk" key for many of its own powder data entries. At least the adding of calculated powder patterns from ICSD into the ICDD has clarified the situation for >4 entries... Armel Le Bail http://sdpd.univ-lemans.fr/course/

Minerals with unknown structure (>300)

ery probably much larger. If you have some names, please send them to me. Best wishes, Armel Le bail http://sdpd.univ-lemans.fr/course/

Re: GSAS code / Museum

ent list of connections at : http://sdpd.univ-lemans.fr/museum/museum.txt Is this useful ? Who knows ? Best Armel Le Bail

Re: GSAS code

>Only exception is Bob von Dreele, who kindly posted the GSAS >source for the benefit of Armel :-) Unfortunately, no benefit at all until now. Still no permission for putting it in the source code museum. Bob possibly considers that his code is not old enough and may post an obsolete version

Re: Stacking Faults

ld really explain what happens physically inside the sample ??? Not me, I have only an idea about the phenomenon... Armel Le Bail http://www.cristal.org/

Re: formate for x-ray data

>I am using fullproof for refine the powder data, only refine the cell >parameters, then I would like to use hkl file to expo programe, how I will >give that hkl file to expo. Plese tell me the format. According to the Fullprof manual : JLKH=-2 --> Output

Re: Software request for index the powder diffraction data.. !!

html For instance, a tutorial about how to determine a structure from powder diffraction data is at : http://sdpd.univ-lemans.fr/iniref/tutorial/indexa.html There is even a commercial Internet Course exactly on that question : http://sdpd.univ-lemans.fr/course/ Best wishes, Armel Le Bail Univ

RE: Size/Strain Round Robin - 1st Report

effects due to stacking faults, but they do not propose any direction- related mean size value (or am I pessimistic too ?-). The manuscript and the next Round Robin steps could benefit from an open discussion here, and viewpoint exchanges. This is not time lost (I hope). Have a nice week-end, A

RE: Size/Strain Round Robin - 1st Report

>Well, although the specimen was nearly strain-free, strictly speaking this >was still a size-strain round robin; all the participants extracted (or >refined) strain parameters, didn't they :-) Before to start, the Round Robin participants were said : "Although the first sample selected for the

RE: Size/Strain Round Robin - 1st Report

ze/Strain experts disqualified these Rietveld-derived methods as giving dubious results, in their opinion. Best, Armel Le Bail SSRR local results at : http://sdpd.univ-lemans.fr/microstruct/ssrr/

Bug in the D8 Advance software ?

the software. But that new version is still bugged... Same problem on your machine ?? Best, Armel Le Bail http://sdpd.univ-lemans.fr/course/

Re: new GSAS (EXPGUI)

Hello Bob, >Attached is the new Linux version (with fixes). Ooops. Now that the GSAS Fortran source is in the mailboxes of > 300 subscribers of the Rietveld mailing list as well as in the list archives, may I add it in the Crystallography Source Code Museum ?-). Armel http://sdpd.univ-lema

Big discount

April first, 2001, A persistent rumor says that DASH, PowderSolve, Endeavour, EVA, Diamond, Cristallographica, Topas, and some other commercial software could become freeware. Moreover, some distance learning courses (SDPD Internet Course, etc) would also be concerned by this unprecedented disc

Re: Neutron diffraction with boron

>Dang... I'm glad that we didn't have to wait for excellent science to >theoretically predict penicillin for us. Absolutely ! The whole humanity is lucky that things to be found, whatever, are discovered times to times. Fire, the wheel, who remember the inventors ? But our era is lacking of m

Re: Neutron diffraction with boron

>Is it really >worth trying to belittle what should turn out to be excellent science? A serendipity case. Once more. Where is excellency exactlly, according to you ? I repeat that excellency would be to produce a theory which would have allowed to predict the MgB2 superconductor properties. The

Re: Neutron diffraction with boron

>If you know how to guarantee high citation levels, go to it :-) Alan, you already occupy the place of leader of the Group of Crystallography at ILL, the best neutron reactor for research in the world ;-). Knowing how cannot ensure to succeed... There are a few other parameters to refine. Armel

Re: Neutron diffraction with boron

>Knowing what the >structure does or doesn't do around the transition would be a prerequisite >to a deeper understanding of the phenomena. We still wait for a deeper understanding of the phenomena, since 1986, right ? And this, after thousands of characterizations. You really think that MgB2 wi

Re: Neutron diffraction with boron

>And yes, the measurements have been done. Well, let me predict the future of the coming paper : high citation level guaranteed, even if there is nothing more than a refinement of the known structure. I would call Science : a new theory explaining, and allowing to predict that a defined compoun

Re: All you wanted to know about the Rietveld mailing list

em, as a rule. Oldest archives (1994-1998) are still available at : http://sdpd.univ-lemans.fr/forum/rietveld_l/index.html Armel Le Bail

Small lie

I must recognize half a lie. ISI has a strategy of conquest of the french market about the Web of Science. They offer 2 months free and illimited access (starting a few days ago). For supporting this strategy, ISI has designed the 301 french laureates according to citation criteria : http://www.i

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