On Wed, 30 Dec 1998 11:55:09 -0500, JIM FLORES[[EMAIL PROTECTED]] wrote:
>>Hi everyone
>>I need some help with the atomic positions for the Fe-Si DO3 structure.
>>
>>Can anyone help me?
>>
>>Thanks and happy new year.
>>
>>
>
>> Regards Jim
>>[JIM FLORES[[EMAIL PROTECTED]]]
>
Until 1992, I was a member of the Institute of Metals and X-Rays, Dresden
University of Technology. Between 1980 and 1990, Fe-Si alloys were highly
investigated in this institute. In principle: DO3 is fcc. It
contains three different lattice positions:
A 0,0,0
B 1/2,1/2,1/2
CD 1/4,1/4,1/4 3/4,3/4,3/4
In the ideal structure, Si is on point A, and Fe is on points BCD. But,
at nonzero temperatures (or nonequilibrium/nonstochiometric systems), there
exist solid solutions with Si on all three positions. B and C/D differs in the
minor Si contents. There are high-temperature order-disorder transformations in
two steps:
DO3->B2(half the lattice constant)->A2(half the lattice constant).
For further details, please contact C.G. Oertel:
[EMAIL PROTECTED]
