The Solid Solution Series (GeTe)x(LiSbTe2)2 (1 ≤ x ≤ 11) and the Thermoelectric Properties of (GeTe)11(LiSbTe2)2

被引：29

作者：

Schroeder, Thorsten ^{[1
]}

Schwarzmueller, Stefan ^{[1
]}

Stiewe, Christian ^{[2
]}

de Boor, Johannes ^{[2
]}

Hoelzel, Markus ^{[3
]}

Oeckler, Oliver ^{[4
]}

机构：

[1] Ludwig Maximilians Univ Munchen, Dept Chem, D-81377 Munich, Germany

[2] German Aerosp Ctr, D-51147 Cologne, Germany

[3] TUM, Forsch Neutronenquelle Heinz Maier Leibnitz FRM I, D-85747 Garching, Germany

[4] Univ Leipzig, IMKM, D-04275 Leipzig, Germany

来源：

INORGANIC CHEMISTRY | 2013年 / 52卷 / 19期

关键词：

PHASE-CHANGE MATERIALS; DIFFRACTION; TRANSITIONS; VACANCIES;

D O I：

10.1021/ic401516m

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Exchanging one Ge2+ with two Li+ per formula unit in (GeTe)(n)(Sb2Te3) (n = 1, 2, 3, ...) eliminates cation vacancies, because it leads to an equal number of cations and anions. This substitution results in the solid solution (GeTe)(x)(LiSbTe2)(2) (with x = n - 1, but n not necessarily an integer). For x < 6, these stable compounds crystallize in a rock-salt-type structure with random cation disorder. Neutron data show that a small fraction of Ge occupies tetrahedral voids for x = 2 and 3. For x> 6, (GeTe)(x)(LiSbTe2)(2) forms a GeTe-type structure that shows a phase transition to a cubic high-temperature phase at ca. 280 degrees C. The thermoelectric properties of (GeTe)(11)(LiSbTe2)(2) have been investigated and show that this compound is a promising thermoelectric material with a ZT value of 1.0 at 450 degrees C. The high ZT value of the thermodynamically stable compound is caused by a low phononic contribution to the thermal conductivity; probably, Li acts as a "pseudo-vacancy".

引用

页码：11288 / 11294

页数：7

共 42 条

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