Dear all,
what kind of search/match
software do you use?
Thanks
From: Armel Le Bail [mailto:[EMAIL PROTECTED]
Sent: Wed 09/03/2005 12:53
To: rietveld_l@ill.fr
Subject: Re: alpha-Na2Ca4(PO4)2SiO4
>does anyone knows the atomic positions for
>PDF No.
33-1229 alpha-Na2Ca4(PO4)2SiO4 Space-group
P-3m1
>or where I can find it?
>I coudn't find in the ICSD database
2/2004.
Producing a calculated powder pattern from 33-1229
and using a
search/match software suggests that this
compound is highly related to the
mineral Nagelschmidtite
(03-9796), itself of "unknown" structure, and to
Ca2SiO4
(86-0401), well known... The fit on the figure is obtained
after
some cell parameters tuning
:
http://sdpd.univ-lemans.fr/33-1229.jpg
The
ICDD-JCPDS PDF is a mine for solving structures said
to be unknown in the PDF
;-). A pity that the guys at
the ICDD-JCPDS do not check their own data
against their
own data ;;;-).
Best
wishes,
Armel
