Lindsay,

I've seen pressed discs of silicon powder that were supplied with older Philips 
diffractometers, and I understand that PANalytical will presently supply them 
with their new machines.  NIST offers no such standard of silicon in a disc 
format.  But I can suggest that you consider SRM 640e which is supplied as 
powder.  One can mount a specimen of it carefully to obtain high density and a 
flat specimen surface, and then infiltrate the powder bed with silicone based 
liquid resin such as Vacseal.  See:

http://www.2spi.com/catalog/vac/vacleak.shtml

The surface of the compact will darken to a uniform color when the infiltration 
is complete.  This will result in a stable compact with the diffraction 
properties of SRM 640e.

Regards,

Jim


James P. Cline
Materials Measurement Science Division
National Institute of Standards and Technology
100 Bureau Dr. stop 8520 [ B113 / Bldg 217 ]
Gaithersburg, MD 20899-8523    USA
jcl...@nist.gov<mailto:jcl...@nist.gov>
(301) 975 5793
FAX (301) 975 5334

From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf Of 
Young, Lindsay Kay
Sent: Friday, July 10, 2015 1:28 PM
To: rietveld_l@ill.fr
Subject: Obtaining a silicon standard wafer


Hello Rietvelders -



This is not exactly a data question, but I am sure someone here can help. I am 
looking into purchasing a silicon powder standard wafer for PXRD instrument 
alignment. However, I am not sure where to get one or how much I might expect 
one to cost. My questions to all of you are:



- Do you know where I could purchase this type of standard?

- How much would you expect to pay for one?

- I have been told Gem Dugout makes these, but they may not be around any more. 
Does anyone know what happened to them?



Thank you very much for your help, and I hope you all have a great weekend!



- Lindsay Young
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