Paper Title:
The Application of the Fundamental Parameters Approach as Implemented in TOPAS to Divergent Beam Powder Diffraction Data
  Abstract

The fundamental parameters approach (FPA) as implemented in TOPAS is investigated for analyses of conventional X-ray powder diffraction (XRPD) data. The FPA involves the convolution of a series of models, each one constituting an individual contribution to the geometric portion of the instrument profile function (IPF). Parameters within each model are refined by least squares to yield a presumably accurate description of the experiment. If one wishes to interrogate the functionality of said models, a diffractometer wherein the uncertainties in optical character are minimized is required. To this end, a diffractometer was built at NIST which featured conventional divergent beam optics in conjunction with a well aligned, stiff, and accurate goniometer assembly. Initial results indicated that the detector arm was flexing; this problem has been addressed with the fabrication and installation of a new arm and counterweight assembly. Data collected from NIST Standard Reference Material (SRM) 660a, lanthanum hexaboride, are analyzed using the FPA method to yield conclusions on the validity of the models with respect to shape and position of the diffraction profiles.

  Info
Periodical
Edited by
Paolo Scardi and Robert E. Dinnebier
Pages
201-219
DOI
10.4028/www.scientific.net/MSF.651.201
Citation
J. P. Cline, D. R. Black, D. Gil, A. Henins, D. Windover, "The Application of the Fundamental Parameters Approach as Implemented in TOPAS to Divergent Beam Powder Diffraction Data", Materials Science Forum, Vol. 651, pp. 201-219, 2010
Online since
May 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: H. Sitepu, Heinz Günter Brokmeier
Abstract:The modelling and/or describing of texture (i.e. preferred crystallographic orientation (PO)) is of critical importance in powder diffraction...
83
Authors: Takashi Ida
I. Plenary and Oral Session
Abstract:A new method for analysis of powder diffraction intensity data recently developed by the author has been modified to include the effects of...
3
Authors: Bharoto, Achmad Ramadhani, Nadi Suparno, Tri Hardi Priyanto
Chapter 9: Measurement and Characterization Techniques
Abstract:National Nuclear Energy Agency of Indonesia has several neutron beam instruments for materials science research. One of the instrument is...
664