Hi to all!, in fact, the Cagliti's expression is just a way to show the angular variation of fwhm, as was mentioned was usef for neutron diffraction and adopted in XRD, we can also build another dependence such as FWMH vs 2theta directly and it is useful to evaluate size and strain, the problem is that many refinement codes have the FWMH angular dependence in terms of Caglioti's equation. By the way, how can I get the paper of Young and Desai?,because I have tried a search in the web,but i did'nt find the article- best regards.
Miguel Hesiquio Miguel Hesiquio-Garduño Profesor Titular "A" Departamento de Ciencia de Materiales Academia de Ciencias de la Ingeniería ESFM-IPN. tel 57 29 60 00 ext. 55003, ext. 55011 On Thu, March 19, 2009 5:22 pm, matthew.row...@csiro.au wrote: > From what I've read of Cagliotti's paper, the V term should always be > negative; or am I reading it wrong? > > Additionally, there is some good work on the use of the Cagliotti (and > TCHZ) functions in the paper by Young and Desai; it also goes over how to > incorporate sample dependent terms into the expression. > > > 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. > > > > Alan Hewat wrote: > >> .... if you have access to the refinement code. >> > > This is why I love Topas. All of the the code used in the refinements is > there for you to see! :) > > > > Cheers > > > Matthew > > > ________________ > Matthew Rowles > > > CSIRO Minerals > Box 312 > Clayton South, Victoria > AUSTRALIA 3169 > > > Ph: +61 3 9545 8892 > Fax: +61 3 9562 8919 (site) > Email: matthew.row...@csiro.au > > > >
