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Re: [sdpd] LaB6 standard sample preparation
> I know this has been discussed before, but I can't find the references. We
> have purchased a batch of the LaB6 standard powder and we want to prepare a
> suitable powder diffraction sample. I was thinking about pressing the
> powder in a pellet, but I seem to remember some people (I think Dr.
> Cranswick was one of them) talking about annealing the sample to avoid
> preferential orientation. Can someone point me to some references about it,
> possibly on the internet ?
Unless I am confusing my history - I believe Joerg Bergmann posted
to this or the Rietveld list saying the latest LaB6 is of very
good quality and can be run native(?). One option could be to
bind the sample into an epoxy polymer and polish it down to
a flat surface - but not sure what others may think of this.
It would at minimum complicate the background.
With me being quoted:
I may have been refering to Y2O3 - annealing this to make a
nice profile standard. Though Joerg did say that the new
NIST LaB6 was better than "annealed Y2O3". I have not had the
chance to run both and compare.
The Rietveld list may be a better place to post if there
is not a variety of replies on this.
Lachlan.
--
-----------------------
Lachlan M. D. Cranswick
Collaborative Computational Project No 14 (CCP14)
for Single Crystal and Powder Diffraction
Birkbeck University of London and Daresbury Laboratory
Postal Address: CCP14 - School of Crystallography,
Birkbeck College,
Malet Street, Bloomsbury,
WC1E 7HX, London, UK
Tel: (+44) 020 7631 6849 Fax: (+44) 020 7631 6803
E-mail: l.m.d.cranswick...@dl.ac.uk
WWW: http://www.ccp14.ac.uk
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