Hi Jim,
i) this is what the NIST web site shows under X-ray constants for the
Silicon lattice parameter: "Concise form 543.102 088(16) x 10-12 m"
ii) this is shown in your SRM 640c Certificate of Silicon Powder:
"0.54311946 nm +-0.00000092 nm"
I can see no overlap of the estimated standard deviations.
Any comment?
Cheers
Michael
======================================
Dr. Michael Nippus
Huber Diffraktionstechnik GmbH
Sommerstr. 4
D-83253 Rimsting / Chiemsee
Germany
Tel. ++49 (0) 8051 6878 14
Fax. ++49 (0) 8051 6878 10
[EMAIL PROTECTED]
www.xhuber.com
======================================
-----Urspr�ngliche Nachricht-----
Von: Jim Cline <[EMAIL PROTECTED]>
An: Rietveld Listserv <[EMAIL PROTECTED]>
Gesendet: Mittwoch, 27. September 2000 17:30
Betreff: SRMs 640c & 660a
> Hi all,
>
> This is to indicate that NIST SRMs 640c, silicon powder, and 660a,
> lanthanum hexaboride powder, are available from the NIST SRM Program sales
> office. These SRMs are certified with respect to lattice parameter at the
> part-per-million level. Considerable effort has been expended to tailor
> the microstructure of these SRMs to exhibit a minimal level of particle
> size and micro-strain induced profile broadening.
>
> Please see:
>
>
http://ois.nist.gov/srmcatalog/certificates/view_cert2gif.cfm?certificate=64
0c
>
> and
>
>
http://ois.nist.gov/srmcatalog/certificates/view_cert2gif.cfm?certificate=66
0a
>
> for views of the certificates which offer a description of the material
and
> the certification method.
>
> 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 8523
> Gaithersburg, MD 20899-8523 USA
>
> ******************************************************************
> NIST Standard Reference Materials Program
>
> Phone: 301 975 6776
> FAX: 301 948 3730
> email: [EMAIL PROTECTED]
> Home Page: http://www.nist.gov/srm
> > Please see home page for copies of NIST SRM certificates. <
> ******************************************************************
>
