Order-Disorder Transition in AgCrSe2: a New Route to Efficient Thermoelectrics

被引:138
作者
Gascoin, Franck [1 ]
Maignan, Antoine [1 ]
机构
[1] ENSICAEN, CNRS, Lab CRISMAT, UMR 6508, F-14050 Caen 04, France
关键词
thermoelectric; phase transition; selenides; layered structure; thermal conductivity; ZN4SB3;
D O I
10.1021/cm200581k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The features of potentially efficient thermoelectric material, AgCrSe 2, exhibiting high Seebeck coefficient, relatively high electrical resistivity, but ultralow thermal conductivity comparable to that of a glass are presented. AgCrSe2 has electrical resistivity ranging in the tenths of milliω· cm. The layered compound AgCrSe2 is a known Ag-ion conductor whose structure can be described as CdI2-type layers of CrSe2- in which the Cr3+ cations are in a distorted octahedral coordination by Se2- anions. There are two different tetrahedral sites in the structure of AgCrSe2 situated between the CrSe2- sandwiches that form a slightly puckered honeycomb lattice. The disorder created by the mixed occupation of the cationic site by the calcium and the ytterbium deteriorates the thermal conduction that becomes temperature independent.
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页码:2510 / 2513
页数:4
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