Re: [sdpd] Reference materials for calibration and indexing

[Armel Le Bail <armel...@fluo.univ-lemans.fr>]

 >While the above implies it can be used out of the bottle(?): 
 >Does In2O3 "need" any annealing or can it be used reliably 
 >out of the bottle? Also, what is the general cost for 10 to 
 >100 grams?

Some annealing seems necessary if you compare the
FWHMs (° 2-theta) of In2O3 and CeO2 recently distributed by
D. Balzar for his Size/strain Round Robin (recorded in "exactly"
the same conditions). There is one Y2O3 too in Powbase, not
annealed. Also is given an Y2O3-a got with the Koalariet package,
probably annealed (?) :

         In2O3         CeO2        2-theta         Y2O3    Y2O3-a
         0.061           0.056         30.5        0.104      0.112
         0.076           0.060         51.0        0.111      0.107
         0.092           0.064         69.4        0.124      0.106
         0.116           0.071         89.8        0.147      0.114
         0.150           0.084        110.1       0.190      0.140
         0.207           0.110        130.2       0.260

About the cost, I have no catalog at home ;-).

>Is it possible to get a "fixed" slit data collection of this
>where all the slit and geometry settings are noted?

Recording conditions were : Bragg Brentano geometry, Cu-Kalpha, 
graphite monochromator in the diffracted beam, Soller 2°, variable
slits ensuring a constant 6mm illumination of the sample surface, 
Soller 2°, receiving slit 0.1mm.  The pattern in PowBase is corrected
by 1/(sin theta) and so is already equivalent to a "fixed" slit data collection.

>I would be quite eager to try out a Fundamental Parameters
>fit using Koalariet/XFIT.

Why exactly the FP approach cannot deal with that variable
slits geometry ?

Armel


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