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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