Thermoelectric properties of heavy-element doped CrN

被引：34

作者：

Quintela, C. X. ^{[1
]}

Rodriguez-Gonzalez, B. ^{[2
]}

Rivadulla, F. ^{[1
]}

机构：

[1] Univ Santiago de Compostela, Ctr Invest Quim Biol & Mat Mol CIQUS, Santiago De Compostela 15782, Spain

[2] Univ Vigo, Dept Quim Fis, Vigo 36310, Spain

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 02期

基金：

欧洲研究理事会;

关键词：

THERMAL-CONDUCTIVITY; OXIDATION BEHAVIOR; PHONON-SCATTERING; HIGH-TEMPERATURE; PBTE;

D O I：

10.1063/1.4861845

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

CrN was doped with Mo and W to study the effect of heavy elements alloying on its thermoelectric properties. An spontaneous phase segregation into Mo- and W-rich regions was observed even at the lowest concentrations probed at this work (similar or equal to 1%). In the particular case of W, this segregation creates nanoinclusions into the Cr1-xWxN matrix, which results in a substantial reduction of the thermal conductivity in the whole temperature range compared to undoped CrN. In addition, an increased hybridization of N:2p and 4d/5d orbitals with respect to Cr:3d decreases the electrical resistivity in lightly doped samples. This improves substantially the thermoelectric figure of merit with respect to the undoped compound, providing a pathway for further improvement of the thermoelectric performance of CrN. (C) 2014 AIP Publishing LLC.

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页数：5

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