Hi,
At 02:09 PM 12/7/2004 +0000, you wrote:
> Dear Stephen, > I have prepared XPD-standard Y2O3 by firing Y2O3 (99.999) from Aldrich > at 1200 �C for 72 hs. (as done in 41-1105 PDF card). > I would also like to ask the other list members if anyone has calibrated > the size-strain broadening of Y2O3 against LaB6, because I have no > access to LaB6 and I've heard that yttria gives broader lines. > Thanks > Leopoldo
From Y2O3 annealed at around 1200 degC, and using fundamental parameters peak fitting in XFIT (BGMN and Topas are currently maintained programs), I get around 3300 Angstrom for crystallite size - and near zero strain (using the size/strain modelling defaults in XFIT). Though don't have a comparison with LaB6.
What is the certificate crystallite size and strain value for NIST LaB6 - via Google, the NIST website seems to be giving a problem finding this out?
http://ois.nist.gov/srmcatalog/certificates/view_cert2pdf.cfm?certificate=660a Error Occurred While Processing Request
Error Diagnostic Information
An error has occurred.
HTTP/1.0 404 Object Not Found
Lachlan
??? Works for me: https://srmors.nist.gov/view_cert.cfm?srm=660A
We estimate the crystallite size of SRM 660a to be 2 microns, and could not find any "strain" broadening, from an FPA (Topas) analysis of conventional, lab XRD data. We have compared SRM 660a to the "super" NAC at ESRF/BM16; but results are qualitative. We would, of course, like to quantify the broadening of SRM 660a, but the project is a bit of a can-of-worms that will have to wait, perhaps until the certification of SRM 660b in ~2 years.
Regards,
Jim
James P. Cline [EMAIL PROTECTED]
Ceramics Division Voice (301) 975 5793
National Institute of Standards and Technology FAX (301) 975 5334
100 Bureau Dr. stop 8520
Gaithersburg, MD 20899-8523 USA
