I am using the software Quanto to quantify some "simple" patterns, mixes of calcite and quartz.
I read a lot of information about Rietveld, but I have not enough knowledgments about crystal structures, PO, etc. I refined a pattern of 15% of quartz and 85% of calcite. I got a Gof of 1.9 using "Model" in the Structure Factor Calculation Procedure (SFCP), but the peak shapes were poorly described (I changed the peak-shape functions and they did not change), but the process got convercence. Then I put the Le Bail option in the SFCP, I got a Gof of 1.1 (the peak-shapes were better than in "Model"), but the process did not get convergence. In both cases, I put the G parameters to correct the PO. WHY?
