Phase stability, structures and properties of the (Bi2)m (Bi2Te3)n natural superlattices

被引：35
作者：
Bos, J. -W. G. [1 ,2 ]
Faucheux, F. [1 ,2 ]
Downie, R. A. [1 ,2 ]
Marcinkova, A. [3 ,4 ]
机构：
[1] Heriot Watt Univ, Inst Chem Sci, Edinburgh EH14 4AS, Midlothian, Scotland
[2] Heriot Watt Univ, Ctr Adv Energy Storage & Recovery, Edinburgh EH14 4AS, Midlothian, Scotland
[3] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland
[4] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3JJ, Midlothian, Scotland
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 193卷
基金：
英国工程与自然科学研究理事会;
关键词：
(Bi-2)(m)center dot(Bi2Te3)(n) natural superlattices; Bi-Te Phase Diagram; Thermoelectricity; TOPOLOGICAL INSULATOR; SERIES;
D O I：
10.1016/j.jssc.2012.03.034
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The phase stability of the (Bi-2)(m) (Bi2Te3)(n) natural superlattices has been investigated through the low temperature solid state synthesis of a number of new binary BixTe1-x compositions. Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 <= x <= 0.70, while an unusual 2-phase region with continuously changing compositions is observed for 0.41 <= x <= 0.43. For x > 0.70, mixtures of elemental Bi and an almost constant composition (Bi-2)(m) (Bi2Te3)(n) phase are observed. Rietveld analysis of synchrotron X-ray powder diffraction data collected on Bi2Te (m=2, n=1) revealed substantial interchange of Bi and Te between Bi-2 and Bi2Te3 blocks, demonstrating that the block compositions are variable. All investigated phase pure compositions are degenerate semiconductors with low residual resistivity ratios and moderate positive magnetoresistances (R/R-0 = 1.05 in 9 T). The maximum Seebeck coefficient is +80 mu V K-1 for x=0.63, leading to an estimated thermoelectric figure of merit, zT=0.2 at 250 K. (C) 2012 Elsevier Inc. All rights reserved.
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页码：13 / 18
页数：6
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