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Ram SESHADRI ( (no email) )
Tue, 12 Aug 1997 09:16:56 -0600
Ian Madsen wrote:
> Subject: Re: Standards etc
> Armel Le Bail has mentioned the use of NAC for calibration of the INEL PSD -
> we had problems in obtaining this material - not to mention the cost. We
> have decided to use Y2O3 (thanks to Bob Roth of NIST for the suggestion)
> since it has a peak roughly every degree in the upper part of the pattern -
> peaks start at about 17deg, so a low angle standard may be required as well.
> Y2O3 is readily available (ours is Alrich 99.99% gold label) at a reasonable
> cost.
Y2O3 is actually a great Rietveld Standard for diffractometers. It's a cube
about 1 nm on edge with nice lineshapes. What's
more, with so many labs working on YBa2Cu3O7, its not hard to find.
Cheers
Ram
seshadri@indigotrem1.chemie.uni-mainz.de