I have a question for the list as I know there are a number of people working on QPA. Ok the question is as follows:-
We have a mixture of a number of crystalline phases (A and B) and an amorphous (glassy) phase. We can do Rietveld refinement on this and get weight percentage (wt.%) values for the crystalline components. We have added a known amount of corundum as a standard and refined again. Example values we get are as follows:- Phase A 10 wt.% Phase B 50 wt.% Corundum 40 wt.% BUT we know we have added only 33 wt.% corundum - are we able to calculate the wt.% of the amorphous content from the known values? I have tried scaling/ratio'ing the values to the known corundum amount therefore giving:- Phase A 8.25 % Phase B 41.25 % Corundum 33 % TOTAL 82.5 % which leaves 17.5 % left over. Hence must be the amorphous part?? I am not totally convinced by this method at all and would love to know how is best to go about solving this problem. Many thanks, Lee ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dr. Lee A. Gerrard BSc CChem CSci MRSC Materials Scientist Materials Science Research Division SB40.1 AWE Plc Aldermaston, Reading, Berkshire RG7 4PR Tel: +44 (0)118 982 6516 Fax: +44 (0)118 982 4739 Email: [EMAIL PROTECTED] ~~~~~~~~~~~~~~~~~~~~~~~~~~~
