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´óʯͷzhy(½ð±Ò+10): ¶àл¶àл 2011-11-09 12:37:33
Armel Le BailÊǸöÈËÃû£¬Ëû·¢Ã÷µÄÒ»ÖÖÄâºÏ·½·¨¡£¾ÍÊÇ Le bail fitting

To overcome some of the problems of theSample Text as experienced at the time, Sample Texttook a wholly different approach to the extraction of the peak intensities from the powder profile. The approach was simple and, perhaps more importantly, it was very easy to code into existing Rietveld programs.

Armel Le Bail¡¯s idea: can the Rietveld extraction method be used to estima
reflection intensities even without a structural model?
the answer :YES

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2Â¥: Originally posted by bianliu199 at 2011-11-05 16:39:56:
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LeBail Method

To overcome some of the problems of the Pawley method as experienced at the time, Armel le Bail took a wholly different approach to the extraction of the peak intensities from the powder profile. The approach was simple and, perhaps more importantly, it was very easy to code into existing Rietveld programs.

The method uses a two-step cyclic process. As with the Pawley method, the following parameters are fitted by a standard least-squares methods:

A,B,C,D,E,F  - Unit-cell metric tensor parameters;
2¦Èzero - Instrumental zero error;
U,V,W  - Peak-width parameters;
¦Ç, etc.  - Other peak-shape parameters.
5Â¥2011-11-09 12:01:39
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