Dear All
Dear users of the Rietveld mailing list My name is Jana Bezjak and currently I work as a PhD student at the Advanced materials department at Jozef Stefan Science Institute in Slovenia. I’m working on hexagonal perovskite and I am a beginner in Rietveld refinement methods of the XRD patterns which is going to be my basic research tool. I try to prepare ceramics by a conventional solid state method in the particular Bam(Nb,W)m-1O3m series of the BaO – WO3 – Nb2O5 ternary system. Hexagonal perovskites with five, nine, twelve and twenty-seven BaO3 layers in the unit cell can be found (as reported by Kemmler and Sack). Among these I try to synthesize single phase Ba5BaWNb2O14 and Ba3W4/3Nb2/3O26/31/3. Recently, it was namely shown that high dielectric performance can be achieved in B-site deficient hexagonal perovskites AmBm-1O3m which containing mixed cubic and hexagonal stacking sequence of their AO3 layers. Best regards Jana Bezjak
Re: magnetic symmerty
Dear Brajendra,
There are some freeware programs that can generate symmetry-allowed
magnetic configurations, and are capable of creating Fullprof-style
input template(*.pcr); examples are Sarah and Basireps (the
latter within Fullprof Suite).
In perovskites in certain cases you might need to construct
a model which would correspond to a coupling of several irreps; see
an excellent book by Yu.A. Izyumov et al. ("Neutron Diffraction of Magnetic
Materials") for more details.
Sincerely,
Maxim.
Monday, August 7, 2006, 11:34:49 AM, you wrote:
> Dear all
> Can somebody help me to get the magnetic symmetry for I4/mcm space
> group of perovskite structures. I am refining the neutron data using
> FULLPROFF programm.
> Please suggest how we assign this magnetic symmetry for provskite structures.
> with regards
> sincerely
> brajendra.
> *
> there's is nothing IMpossible in this world as the word itself says "I M
> Possible".
> *
> Brajendra Singh [EMAIL PROTECTED]
> Research Scholar contact No.
> C/o Prof.S.Sundar Manoharan +91-0512-2596043
> Department of Chemistry
> IIT Kanpur-208016, INDIA.
> -
> *
>> http://xray.uu.se/hypertext/XREmission.html
>>
>>> can you remind me what the peak position of the tungsten L-alpha for the
>>> Cu
>>> X-ray tube?
>>
>>
>> *
>> Univ.-Doz. Dr. Uwe Kolitsch
>> Institut für Mineralogie und Kristallographie
>> Geozentrum, Universität Wien
>> Althanstr. 14
>> A-1090 Wien
>> Austria
>> Tel +43-1-4277-53239
>> Fax +43-1-4277-9532
>> e-mail: [EMAIL PROTECTED]
>> website: http://www.univie.ac.at/mineralogie/kolitsch.htm
>> **
>>
>>
>>
> __ Èíôîðìàöèÿ NOD32 1.1475 (20060406) __
> Ýòî ñîîáùåíèå ïðîâåðåíî Àíòèâèðóñíîé ñèñòåìîé NOD32.
> http://www.eset.com
---
Dr. Maxim Lobanov
R&D Director
NMG Company
mailto:[EMAIL PROTECTED]
magnetic symmerty
Dear all Can somebody help me to get the magnetic symmetry for I4/mcm space group of perovskite structures. I am refining the neutron data using FULLPROFF programm. Please suggest how we assign this magnetic symmetry for provskite structures. with regards sincerely brajendra. * there's is nothing IMpossible in this world as the word itself says "I M Possible". * Brajendra Singh [EMAIL PROTECTED] Research Scholar contact No. C/o Prof.S.Sundar Manoharan +91-0512-2596043 Department of Chemistry IIT Kanpur-208016, INDIA. - * > http://xray.uu.se/hypertext/XREmission.html > >> can you remind me what the peak position of the tungsten L-alpha for the >> Cu >> X-ray tube? > > > * > Univ.-Doz. Dr. Uwe Kolitsch > Institut für Mineralogie und Kristallographie > Geozentrum, Universität Wien > Althanstr. 14 > A-1090 Wien > Austria > Tel +43-1-4277-53239 > Fax +43-1-4277-9532 > e-mail: [EMAIL PROTECTED] > website: http://www.univie.ac.at/mineralogie/kolitsch.htm > ** > > >
Re: peak position of W L-alpha for Cu X-ray tube
http://xray.uu.se/hypertext/XREmission.html > can you remind me what the peak position of the tungsten L-alpha for the Cu > X-ray tube? * Univ.-Doz. Dr. Uwe Kolitsch Institut für Mineralogie und Kristallographie Geozentrum, Universität Wien Althanstr. 14 A-1090 Wien Austria Tel +43-1-4277-53239 Fax +43-1-4277-9532 e-mail: [EMAIL PROTECTED] website: http://www.univie.ac.at/mineralogie/kolitsch.htm **
