Optimizing the thermoelectric performance of FeVSb half-Heusler compound via Hf-Ti double doping

被引：33

作者：

El-Khouly, A. ^{[1
,2
]}

Novitskii, A. ^{[1
]}

Serhiienko, I ^{[1
]}

Kalugina, A. ^{[1
]}

Sedegov, A. ^{[1
]}

Karpenkov, D. ^{[3
]}

Voronin, A. ^{[1
]}

Khovaylo, V ^{[1
,4
]}

Adam, A. M. ^{[5
]}

机构：

[1] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia

[2] Damanhour Univ, Fac Sci, Phys Dept, Damanhour 22516, Egypt

[3] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[4] Natl Res South Ural State Univ, Chelyabinsk 454080, Russia

[5] Sohag Univ, Fac Sci, Phys Dept, Sohag 82524, Egypt

来源：

JOURNAL OF POWER SOURCES | 2020年 / 477卷

基金：

俄罗斯基础研究基金会;

关键词：

Thermoelectric performance; Half-heusler alloys; Hf-Ti dual-doping; Disorder scattering parameters; Phonon scattering; Lattice thermal conductivity; LATTICE THERMAL-CONDUCTIVITY; FIGURE-OF-MERIT; P-TYPE; TRANSPORT-PROPERTIES; ENHANCEMENT; SEMICONDUCTOR; TEMPERATURE; CRYSTAL; ALLOYS; SIZE;

D O I：

10.1016/j.jpowsour.2020.228768

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：

FeVSb-based half-Heusler (HH) compound has recently been identified as promising medium-high temperature thermoelectric (TE) materials for power generation applications. In this study, enhanced thermoelectric performance of Fe(V0.8Hf0.2)(1-x)TixSb (x = 0.0, 0.2, 0.4, 0.5, 0.6) HH alloys by Hf-Ti dual-doping was reported studied in a temperature range from 100 to 900 K. A high content of Ti doping not only optimized the carrier concentration but also reduced the lattice thermal conductivity, which all contribute to high zT. As a result, a zT value was increased by -20% at 873 K for Fe(V0.8Hf0.2)(0.8)Ti0.2Sb compound. Hf-Ti dual doping significantly reduced the lattice thermal conductivity due to enhanced point defect scattering which is mainly attributed to mass fluctuations. Hence, suppressed the material's total thermal conductivity. A reduction of similar to 20% was obtained for the Fe(V0.8Hf0.2)(0.8)Ti0.2Sb sample, compared with the single Hf-doped FeVSb sample and of similar to 80% compared to FeVSb at room temperature.

引用

页数：8

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