Hongwu wrote:

>Could someone out there recommend me several papers regarding ab initio
>Rietveld refinement? 

The more complete list of review papers (38 !) about structure 
determination by powder diffractometry is available at :
   http://pcb4122.univ-lemans.fr/iniref/revpap.html
Other goodies including details on 350 experimental cases
searchable by keywords (that will show you if GSAS is
sufficient or not), a tutorial, (...), are gathered at :
  http://pcb4122.univ-lemans.fr/iniref.html

Nanocrystalline means large FWHMs and difficulties if
the structure is complex. Obtaining a better crystallinity, if 
possible, would be the first step.

Best wishes,

Armel Le Bail - Universit� du Maine, Laboratoire des Fluorures,
CNRS ESA 6010, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
http://www.cristal.org/

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