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A method for synthesizing metastable high Tc compounds has been developed.
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Method for Synthesizing Metastable High Tc Compounds
A method for synthesizing metastable high Tc compounds has been
Many A15-type compounds are known to have high Tc (e.g., Nb(3)Ge,
Nb(3)Sn, Nb(3)Ga) when they have an average electron-atom ratio in the range
between 4.5 and 4.75 The Machlin and Chow model  allows one to select alloy
systems which, if crystallized in the A-15 structure, will possess high Tc.
Furthermore, the lattice parameter of these phases can be produced by the
model of Machlin and Whang .
Unfortunately, many of the high Tc materials predicted by this procedure are
metastable. To stabilize these phases one may epitaxially grow the metastable
alloy on a substrate having the same crystal structure and lattice parameter as
the A-15 phase to be grown, for the metastable phase will grow if the total
interface energy is sufficiently less than that corresponding to the stable phase
form of the deposited material to overcome the enhanced bulk stability of the
latter. References E. S. Machlin and T. Paul Chow, "Correlation Between Tc and
a Calculated Force Constant in Homologous Crystal Structures," J. Low Temp.
Phys. 31, 699 (1978). E. S. Machlin and S. H. Whang, "A15 - A Structure
Stabilized by Crystal Field Distortion of 'Exotic' Elements at Chain Sites," J. Phys.
Chem. Solids 39, 607 (1978).