Re: Standards etc

Ian Madsen ( Ian.Madsen@minerals.csiro.au )
Tue, 12 Aug 1997 15:42:45 +1000

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. You may need to heat the material to ensure that crystallite size is
as large as possible - we heat at 1200C for a few days - this makes a small,
but observable, difference to the peak widths.

At 11:36 AM 10/8/97 +0200, you wrote:
>
>Another standard which has already been discussed on this
>list is NAC (NaCa2Al3F14), frequently used on the INEL
>120 PSD for calibration. The main inconvenient is its cost.
>The producer (which is in my lab) sells it for a price larger
>than gold itself (but lower than diamond :-)...
>
>
>Armel Le Bail, back of vacations.
>
>

Cheers

**** WE HAVE MOVED - PLEASE NOTE CHANGE OF ADDRESS ****

\ | /
___\|/___
(o o)
*-------------oOO--(_)--OOo-----------------*
Ian Madsen
CSIRO Minerals
Box 312
Clayton South 3169
Victoria
AUSTRALIA

Phone +61 3 9545 8785 direct
+61 3 9545 8500 switch
FAX +61 3 9562 8919
Email Ian.Madsen@minerals.csiro.au

XRD laboratory 'tour' starts at
http://www.minerals.csiro.au/tour/begin.htm
*-----------------/ \Oooo.-----------------*
.oooO ( )
( ) ) /
\ ( (_/
\_)