I would like to receive a copy of this paper too. Thank you in advanced Renato Bastos Guimarães Laboratório de Difração de Raios X -(LDRX-uff) Instituto de Fisica Universidade Federal Fluminense Av. Litoranea s/n 24210-346 Niteroi RJ Brasil E-mail: [EMAIL PROTECTED] Phone: 55 21 2629-5790 Fax: 55 21 2629-5887
-----Mensagem original----- De: Leandro Bravo [mailto:[EMAIL PROTECTED] Enviada em: segunda-feira, 25 de junho de 2007 21:13 Para: [email protected] Assunto: 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: [email protected] >To: [email protected] >Subject: Re: More Caglioti U V W parameters >Date: Tue, 26 Jun 2007 09:51:27 +1000 > >Matthew, could I please get the PDF version of the paper? > >thanks, KLaus-Dieter. > > > > >[EMAIL PROTECTED] wrote: >>Just to add more fat to the fire.... >> Have a look at Young, R. A. & Desai, P. 1989, 'Crystallite Size and >>Microstrain Indicators in Rietveld Refinement', /Archiwum Nauki o >>Materialach,/ vol. 10, no. 1-2, pp. 71-90. (I can send the PDF if needs >>be) >> They talk about the Thompson, Cox and Hastings model, which explicitly >>separates the gaussian and lorentzian components of a psuedo-Voight peak >>shape. >> FWHM(G)^2 = U tan^2(T) + V tan(T) + W >>FWHM(L) = X tan(T) + Y/cos(T) >> As Prof. Stephens pointed out (and is stated in Yound and Desai), the >>coefficients can be broken into instrumental and sample (size, strain) >>components. >> U = U_inst + U_strain >>V = V_inst >>W = W_inst >>X = X_inst + X_strain >>Y = Y_inst + Y_size >> You can fix the instrument components with your standard, and then >>refine the difference with your sample. >> If you want to stick with the straight UVW symbolism, Young and Desai >>also state that you can use the size broadening term FHWM(G)^2 = >>Z/cos^2(T), which yields: >> FWHM(G)^2 = Z/cos^2(T) + (U_inst + U_strain) tan^2(T) + V_inst tan(T) + >>W_inst >> which can be re-written as >> FWHM(G)^2 = (U_inst + U_strain + Z_size) tan^2(T) + V_inst tan(T) + >>(W_inst + Z_size) >>as long as you constrain the two Z_size's to be the same. >> The last equation is what Prof Stevens alludes to in his "refinement of >>U and W", all of the sample related parameters are folded up there. >>Of course, your mileage may vary... >> >> >>Cheers >> >>Matthew >> >>________________ >>Matthew Rowles >> >>CSIRO Minerals - Clayton >> >>Ph: +61 3 9545 8892 >>Fax: +61 3 9562 8919 (site) >>Email: [EMAIL PROTECTED] >> >> > >-- >Dr. Klaus-Dieter Liss >Senior Research Fellow > >The Bragg Institute, ANSTO >PMB 1, Menai, NSW 2234, Australia >New Illawarra Road, Lucas Heights >T: +61-2-9717+9479 >F: +61-2-9717+3606 >M: 0419 166 978 >E: [EMAIL PROTECTED] >http://www.ansto.gov.au/ansto/bragg/staff/s_liss.html >private: http://liss.freeshell.org/ _________________________________________________________________ Inscreva-se no novo Windows Live Mail beta e seja um dos primeiros a testar as novidades-grátis. Saiba mais: http://www.ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e -4911fb2b2e6d -- Esta mensagem foi verificada pelo sistema de antivírus e acredita-se estar livre de perigo. = -- Esta mensagem foi verificada pelo sistema de antivírus e acredita-se estar livre de perigo.
