The best way of learning is to sit in a training class. Unfortunately either because short of fund on my personal side or on the employer side or on both side, I never got a chance to going to any of the these software training classes. [Certainly in the remote past, I took several semesters of crystallography and mineralogy, and a semester of x ray diffraction in graduate school]. Thinking about the translations and rotations of the atoms really helps when having a hard time sleeping.
Training material on BGMN:
Dr. Bergmann: bgmn.de
DR. Doblin
http://profex.doebelin.org/wp-content/uploads/2014/02/Lesson-4-Rietveld-Refinement.pdf
http://journals.iucr.org/j/issues/2015/05/00/kc5013/kc5013.pdf
Dr. Ufer and Dr. Kleeberg
http://www.nist.gov/mml/upload/6-3_KUfer_APD_IV.pdf
and their papers in 2004 and 2012 (I'll put the links here)
http://topaz.ethz.ch/function/web-het-secured/pdfs/Ufer-2005.pdf
(the following is my personal opinion. you may completely disagree)
The 2004 paper's highlight: supercell and separate treatments of 00l and hkl
The 2012 paper's highlight: mixed-layer illite/smectite with random or ordered stratification (variation of reichweite number from 0 to 3); linked model (or shared parameters) between the two structures. My dream a while back was to combine newmod and wildfire together with refinable parameters; now it comes true.
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