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Properties of Bi 2 Te 3 ‐Sb 2 Te 3 Alloys



The phase diagram for the Bi 2 Te 3 ☒Sb 2 Te 3 pseudo‐binary system is of the solid‐solution type, where the distribution coefficient k is equal to unity at 33.3 and 66.7 mole % Sb 2 Te 3 . The c lat tice parameter remains essentially constant across the diagram at 30.49 Å for both slowly crystallized and quenched alloys. For quenched alloys the a lattice parameter decreases almost linearly, from a value of 4.487 Å, for pure Bi 2 Te 3 , to a value of 4.275 Å, for pure Sb 2 Te 3 ; however, a significant contraction from linear variation is found in slowly crystallized materials. E G diminishes in an essentially linear fashion from 0.16 eV, for pure Bi 2 Te 3 , to 0.12 eV at 24.2 mole % Sb 2 Te 3 in both slowly crystallized and quenched materials. E G remains approximately constant from 24.2 to 66.7 mole % Sb 2 Te 3 for slowly crystallized materials but continues to drop for quenched materials.



Journal of Applied PhysicsAmerican Institute of Physics

Published: Jul 1, 1962

DOI: 10.1063/1.1728925

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