Thermoelectric performance of nanostructured p-type Zr0.5Hf0.5Co0.4Rh0.6 Sb1-xSnx half-Heusler alloys

被引：18

作者：

Maji, Pramathesh ^{[1
]}

Makongo, Julien P. A. ^{[1
]}

Zhou, Xiaoyuan ^{[2
]}

Chi, Hang ^{[2
]}

Uher, Ctirad ^{[2
]}

Poudeu, Pierre F. P. ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Lab Emerging Energy & Elect Mat, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2013年 / 202卷

基金：

美国国家科学基金会;

关键词：

Half-Heusler; Mechanical alloying; Nanostructure; Microstructure; Thermoelectric properties; Phonon scattering; TRANSPORT-PROPERTIES; CONDUCTIVITY;

D O I：

10.1016/j.jssc.2013.03.024

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Several compositions of the p-type half-Heusler alloys Zr0.5Hf0.5Co0.4Rh0.6Sb1-xSnx (0 <= x <= 0.4) were synthesized by mechanically alloying high purity elemental powders using hardened steel jars and balls on a high energy shaker mill. Powder X-ray diffraction (XRD) investigations of several aliquots taken after regularly spaced milling time suggested that single phase products with half-Heusler (HH) structure can be obtained after 10 h. However, XRD and transmission electron microscopy (TEM) studies of several specimens obtained from compacted polycrystalline powders of Zr0.5Hf0.5Co0.4Rh0.6Sb1-xSnx alloys using a uniaxial hot press (HP) revealed the presence of CoSb inclusions with various sizes embedded inside the HH matrix. Hall effect, electrical conductivity, and thermopower data collected between 300 K and 775 K on several compositions suggested that electronic transport in the synthesized Zr0.5Hf0.5Co0.4Rh0.6Sb1-xSnx/CoSb composites strongly depends on the average size and/or mole fraction of the embedded CoSb inclusions rather than the fraction (x) of Sn substituting for Sb. Among the samples investigated, the nanocomposite with x=0.2, which contains nanometer-scale CoSb inclusions, showed the largest power factor (800 mu W/K-2 m at 775 K) and the lowest lattice thermal conductivity (similar to 2.2 W/m K at 775 K) leading to a six-fold enhancement in the figure of merit when compared to the Zr0.5Hf0.5Co0.4Rh0.6Sb0.99Sn0.01 bulk matrix. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：70 / 76

页数：7

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