Enhancing the thermoelectric efficiency in p-type Mg3Sb2via Mg site co-doping

被引:32
作者
Tiadi, Minati [1 ,2 ]
Battabyal, Manjusha [1 ]
Jain, P. K. [3 ]
Chauhan, Avnee [2 ]
Satapathy, Dillip K. [2 ]
Gopalan, Raghavan [1 ]
机构
[1] Int Adv Res Ctr Powder Met & New Mat ARCI, Ctr Automot Energy Mat, IITM Res Pk, Chennai 600113, Tamil Nadu, India
[2] Indian Inst Technol Madras, Dept Phys, Soft Mat Lab, Chennai 600036, Tamil Nadu, India
[3] Int Adv Res Ctr Powder Met & New Mat ARCI, Ctr Carbon Mat, Hyderabad 500005, Telangana, India
关键词
LATTICE THERMAL-CONDUCTIVITY; POWER-FACTOR; PERFORMANCE; MICROSTRUCTURE; SKUTTERUDITES; ENHANCEMENT; MG3SB2; SNSE;
D O I
10.1039/d1se00656h
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
Mg3Sb2 based Zintl compounds are promising thermoelectric materials due to the abundance of magnesium and antimony in nature. However, the main hindrance in realizing the full potential of Mg3Sb2 compounds for thermoelectric applications is the low figure of merit (zT) of p-type Mg3Sb2, in comparison with its n-type counterpart. We report here the enhancement of the thermoelectric properties of p-type Cu and Ag co-doped Mg3Sb2 processed by a solid-state synthesis route. The samples contain alpha-Mg3Sb2 as a major phase along with elemental Sb as a minor phase. The doped Mg3Sb2 compounds are thermally stable up to 773 K, irrespective of the presence of a small amount of Sb. The co-doping of Ag and Cu in Mg3Sb2 is found to enhance the power factor to 0.8 mW mK(-2) and the thermoelectric figure of merit to 0.76 at 673 K. This is the highest figure of merit among doped p-type Mg3Sb2 compounds reported to date. The rattling of the heavy atoms in co-doped Mg3Sb2 is found to significantly reduce the lattice thermal conductivity, which enhances the thermoelectric figure of merit. This work proposes an effective strategy to enhance the zT of p-type Mg(3)Sb(2)via Cu-Ag co-doping at Mg sites.
引用
收藏
页码:4104 / 4114
页数:11
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