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
Rh2 0.170 1/4 0.570
Sn 0.710 1/4 0.610
Rh Sn, P213, a = 5.134
Rh 0.142 0.142 0.142
Sn 0.841 0.841 0.841
Jim Kaduk
-----Original Message-----
From: Lorenzo Stievano [mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 19, 2000 9:57 AM
To: [EMAIL PROTECTED]
Subject: Rh-Sn..
Hello to everybody,
my name is Lorenzo Stievano, and I am a post-doc at Venice (Italy).
I am currently dealing with the preparation of Rh-Sn alloys, which I
need as reference for the study of bimetallic catalysts. I tried to
prepare by arc-melting and successive annealing in quartz tube
(following the phase diagram) the whole range of intermetallics. In the
meantime, I also tried to find the structures of these intermetallics,
which I found in fact in the Pearson's handbook.
However, most of these structures (which were all deduced about 50 years
ago) do not seem to reproduce the experimental patterns I got from my
compounds. In fact, in most patterns several lines are present which do
not belong to any of these intermetallics, nor to the two pure metals or
to simple Sn and Rh oxides which might have formed at those conditions.
For some of the species, in addition, I have problem in refining the B
factors (which turn out negative from the fit...)
I wanted to ask if anybody in this list has anytime dealt with this
system (or similar systems, like Pt-Sn and Pd-Sn) or at least knows
about some new datas about Rh2Sn, Rh3Sn2, RhSn, RhSn2 or RhSn4, which
are the ones I found in the handbook, or about the existence of species
found more recently.
Thanks in advance,
lorenzo
