A study of the phases in the bismuth - tellurium system

Bi 2Te 3 crystallizes in rhombohedral system, space group R3̄m. The hexagonal cell, a = 4.395(3) A ̊ and c = 30.44(1) A ̊ , contains three formula units. D x = 7.83 Mgm −3, μ = 64.17 mm −1. Its structure, refined from a single crystal, consists of 15 layers stacked along the ”c-axis“ and presents th...

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Bibliographic Details
Published in:Materials research bulletin 1993, Vol.28 (6), p.591-596
Main Authors: Feutelais, Y., Legendre, B., Rodier, N., Agafonov, V.
Format: Article
Language:English
Subjects:
Annealing
Crystal structure
Crystallization
Diffraction
Phase diagrams
Phase transitions
Structure (composition)
Tellurium compounds
Thermal effects
Thermoelectricity
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Summary:Bi 2Te 3 crystallizes in rhombohedral system, space group R3̄m. The hexagonal cell, a = 4.395(3) A ̊ and c = 30.44(1) A ̊ , contains three formula units. D x = 7.83 Mgm −3, μ = 64.17 mm −1. Its structure, refined from a single crystal, consists of 15 layers stacked along the ”c-axis“ and presents the combination of 3-layer stacks of (TeBiTeBiTe) composition. The coordination polyhedron of each atom is a distorted octahedron. The comparison of calculated and observed powder diffraction patterns allowed us to put in evidence a texture effect. A single crystal of the new phase Bi 8Te 9 has been obtained by thermal annealing. Preliminary diffraction study shows an hexagonal lattice with a = 4.41 A ̊ and c ≈ 103 A ̊ . A model of structure is proposed.
ISSN:0025-5408
1873-4227
DOI:10.1016/0025-5408(93)90055-I