Dear all I have a series of X-ray powder diffractograms that show the segregation of platinum from Pt4+ doped ceria. I would like to analyze the segregation kinetics from these data.
I fit the Histogram Scale Factor and define a constrain that all phase fractions add up to 1.0. For consistency I would like to set up a constrain of the form 0:0:Scale * 0::Afrac:3 + 1:0:Scale fraction_doped_ceria * Pt4+ occupancy plus fraction_segregated_platinum i.e. a constrain that makes the amount of platinum in the system constant (under the assumption that all platinum is 'visible' i.e. no X-ray amorphous Pt clusters are present). At present (Rev 2493) this does not seem to be possible and I try to manually set the correct Pt4+ occupancy. This is rather tedious iteration process. Could this be implemented in GSASII or is my analysis faulted? Thanks for any suggestions -- Dr. Ivo Alxneit Catalysis for Energy Group Bioenergy and Catalysis Laboratory phone: +41 56 310 4092 Paul Scherrer Institute fax: +41 56 310 2688 CH-5232 Villigen gnupg key: 0x515E30C7 Switzerland https://www.psi.ch/ceg/catalysis-for-energy-group/
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