RE: Laboratory supplies/equipments for application of the Rietveld Method (quantitative analysis)

Sep 26, 2007, at 9:30 AM, Leandro Bravo wrote: Hi All!! I´m searching for some equipments, supplies that could be useful to the application of the Rietveld Method (quantitative analisys) like zero-background sample holders, mill etc... in other words, equipments for sample prepare to avoid

CIF/STR file of hydrobiotite (annite/biotite + vermiculite)

Hi all, I´ve searched in several databases(including ICSD) and did not find a cif file of hydrobiotite. Could somebody, please, tell me if a cif file of this phase exist?! Thank you in advance, Leandro _ Receba as últimas n

Laboratory supplies/equipments for application of the Rietveld Method (quantitative analysis)

Hi All!! I´m searching for some equipments, supplies that could be useful to the application of the Rietveld Method (quantitative analisys) like zero-background sample holders, mill etc... in other words, equipments for sample prepare to avoid preferred orientation, microabsorption, etc.. W

Re: More Caglioti U V W parameters

I´d like to read this paper too. So if you could send me a copy, Matthew, I´d be very pleased. Regards and thanks, Leandro From: Klaus-Dieter Liss <[EMAIL PROTECTED]> Reply-To: rietveld_l@ill.fr To: rietveld_l@ill.fr Subject: Re: More Caglioti U V W parameters Date: Tue, 26 Jun 2007 09:51:27

RE: Emission profile determination using the TOPAS software

hen save the new emmission profile for use in subsequent refinements. Note that the CoKb emmission line area is just another parameter to be added when creating an instrument profile function. Dipo Omotoso -Original Message----- From: Leandro Bravo [mailto:[EMAIL PROTECTED] Sent: Sat 5/26

Emission profile determination using the TOPAS software

Hi all, again In al my refinements in TOPAS I use the emission profile present in the lam fold of TOPAS. The emission profile is CoKa7 (the D4 that we use, use a Co tube, radiation), but in our obtained DRX patterns the CoKb peaks appear and are becoming a problem in TOPAS, because it is affec

Re: Hydroxiapatite, carboapatite and fluorapatite - Request of

s=14741636&dopt=Citation According to the above, carbonate replaces some of the phosphate resulting in average shrinking of these tetrahedra. They also located what might be the water from their neutron refinement, which you won't see if you are using X-rays :-) Alan. At 03:57 23/

Hydroxiapatite, carboapatite and fluorapatite - Request of STR files

Hi all, I´m refining a sample which contains a hydroxycarbofluorapatite (solid solution). I´m refining it using CIF files from the ICSD, but it´s not working so well, because they don´t have the file for the hydroxycarbofluorapatite. So I´m using in the TOPAS the following files: fluorapatite

Re: Problems using TOPAS R (Rietveld refinement)

Mr. Kleeberg, Read the paper that you send to me, ´´RIETVELD ANALYSIS OF DISORDERED LAYER SILICATES``, and I have some questions about it. In the refinement of chlorite minerals with well defined disordering (layers shifting by exactly b/3 along the three pseudohexagonal Y axis), you separat

RE: Problems using TOPAS R (Rietveld refinement)

tent. It is possible to get the peak shapes without changing peak intensities; if you need assistance then contact me off the list. Cheers Alan -Original Message- From: Leandro Bravo [mailto:[EMAIL PROTECTED] Sent: Friday, 16 March 2007 9:15 AM To: rietveld_l@ill.fr Subject: Re: Problems

RE: Problems using TOPAS R (Rietveld refinement)

I know that refining the atoms positions is ´´too much´´, exagerated. But is the only way I can make the calculated DRX pattern fit with the measured one. There must a problem in the instrument details since I´m using Fundamental Parameters (FP) for peak shape, the values I put in the instrumen

Re: Problems using TOPAS R (Rietveld refinement)

Ok, I´m starting to have sucess in the kaolinite refinement, the quantification is giving me reasonable values. I´m refining the thermal factors, all the atoms positions in the kaolinite, the lattice parameters and the cystallite size. Lattice parameters and crystallite size are giving me very

Re: Problems using TOPAS R (Rietveld refinement)

from 5 (2-theta) to 120 (2-theta), and I´m realizing that above 80° I´m getting unecessary data (basically just backgorund). The question is how this ´´unecessary data`` affect the quantification?!?! From: "Leandro Bravo" <[EMAIL PROTECTED]> Reply-To: rietveld_l@ill.fr To: r

Re: Problems using TOPAS R (Rietveld refinement)

se them with sure?! 3) In TOPAS how do I know if the refinement is good?! Because each time I refine the 50%/50% mixture I have different results and I don´t know wich one gives me a result that I can trust. Thank ou in advance, Leandro Bravo Ferreira da Costa Student, UFRJ - Universidade Fede

Problems using TOPAS R (Rietveld refinement)

one gives me a result that I can trust. Thank ou in advance, Leandro Bravo Ferreira da Costa Student, UFRJ - Universidade Federal do Rio de Janeiro - BR CETEM - RJ _ Inscreva-se no novo Windows Live Mail beta e seja um dos primeiros