Dear Mario, Please tell me a little about the data collection conditions you used for this work:-
How was the sample prepared (hand ground, micronised in McCrone mill ????) What was the tube target Cu, Co, other ?? Cheers Ian Madsen ________________________________________ From: [EMAIL PROTECTED] [EMAIL PROTECTED] Sent: Tuesday, October 28, 2008 2:48 AM To: Rietveld_l@ill.fr Subject: Quantitative analysis Dear all, I have this question, I have been refined one mixture (of well-know percentage composition) of CaCO3, CaF2, SiO2 and Al2O3, with preferential orientation in CaCO3 (104) and CaF2 (111) with good results. When I add to the mixture FeCO3 and I refine with preferential orientation (104), it happens that when I don´t apply the preferential orientation in all this phases, I have correct values of percentage composition, but when I apply the preferential orientation the refinement is good but with incorrect values of percentage composition. This experiment has been taken in Bragg Brentano geometry. How I should refine this mixture? Thanks a lot by your help. Mario Macías Universidad Industrial de Santander Colombia
