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Jon:
The way to do it is to in fact use two phases, and constrain all the
structural parameters to be the same. I have used this approach
successfully on a similar problem.
Jim Kaduk
> --
> From: Jon Wright[SMTP:[EMAIL PROTECTED]]
> Reply To: RIETVELD_L Distribution List
>
In the CRYSTMET database, there are structures for three alloys:
Rh Sn2, I4/mcm, a = 6.410, c = 5.656
Rh 0 0 1/4
Sn 0.1605 0.6605 0
Rh2 Sn, Pnma, a = 5.520, b = 4.221, c = 8.208
Rh1 0.104 1/4 0.210
Title: PDF Workshop
By
adding a known concentration of a crystalline internal standard, and doing a
Rietveldr efinement, you can quantify the crystalline phases, and the amorphous
component by difference.
-Original Message-From: Anthony Manerbino
[mailto:[EMAIL PROTECTED]]Sent:
Title: Message
What
is the unit cell? Have you tried looking for analogous compounds with the
same (or similar) unit cells? You might be able to avoid solving the
structure if a model is already out there. What is the space group?
It may be that it is one with a floating origin, and that
I have a (non-working) Scintag PAD V diffractometer, with a Spellman
generator and an Ortec Ge detector. I'm willing to give it to someone
who could use it for spare parts and/or is willing to make it work.
Free, but you have to pick it up or pay for shipping it to you.
Jim Kaduk
INEOS Technologi
Hi, Cora:
Some nibbles so far, but no definite takers yet. Twice this summer, we
lost both the detector (I had the first one repaired and the tube. I
suspect that ther are problems both in detector supply and in the
Spellman. I don't have the resources to track the failures down.
Jim
__
The PDF-4+ database itself will permit you to enter a d/I list (either manually
or from a file), and you can apply various profile functions to it.
Jim Kaduk
INEOS Technologies
Naperville IL USA
-Original Message-
From: Jean-Marc Joubert [mailto:[EMAIL PROTECTED]
Sent: Wednesday, Janua
