Hi all,
I have a question concerning density calculations, I'm actually working on an amorphous phase quantification method using Rietveld and most part of the samples I'm working with contain high quantity of silica (amorphous and crystalline). I've attentively read the paper: "Determination of the crystallized fractions of a largely amorphous multiphase material by the Rietveld method" (X. Orlhac, C. Fillet,...) and I found out that the Brindley correction can be applied in my case. When I calculate the linear absorption coefficient of each phase I must to take into account also the amorphous phase, isn't it? . I just would like to know if someone could indicate me how to calculate this factor making difference between an amorphous and a crystalline phase (for example, concerning silica). I know the atomic absorption coefficient of each element must be multiplied by the packaging density in the case of powders but it just talks about the crystalline phases, what about the amorphous phase? Thanks for your help Sincerely, Maria Fabra Puchol Responsable Laboratoire Structures Structural Laboratory Manager ------------------------------------- Saint-Gobain CREE 550 Avenue Alphonse Jauffret BP224 84306 Cavaillon Cedex - France tel: 00 33 4 32 5 09 36 fax: 00 33 4 32 50 08 51 e-mail: [EMAIL PROTECTED]
