收录:
摘要:
Developing high performance n-type thermoelectric (TE) materials is fundamentally important for developing high efficiency TE devices. AgBiSe2, which reveals superior n-type TE performance in a cubic phase, crystallizes in a hexagonal phase at room temperature, and typically, undergoes phase transitions to a cubic phase at a temperature above 580 K. Here, for the first time, through entropy optimization with lead-selenides (>= 9.9 mol%), the high-temperature cubic phase of AgBiSe2 is stabilized from 300 to 800 K. Furthermore, the AgBiSe2-PbSe pseudo-binary diagram is established. The resultant alloys with optimized entropy possess unique local distorted cubic lattices, which contribute low lattice thermal conductivity approaching 0.3 W m(-1) K-1 in extended operating temperature range. Consequently, a peak figure of merit zT value of approximate to 0.8 at 800 K and a record-high average zT value of 0.42 for n-type I-V-VI2 compounds are attained in pure phase cubic n-type (AgBiSe2)(1-)(x)(PbSe)(x) solid solutions. These results pave the way for developing new TE materials via entropy engineering.
关键词:
通讯作者信息:
电子邮件地址:
来源 :
ADVANCED ENERGY MATERIALS
ISSN: 1614-6832
年份: 2020
期: 5
卷: 11
2 7 . 8 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:169
归属院系: