Nonstoichiometric Fe–V–Al full Heusler alloys under high pressure: thermoelectric properties

IF 1.2 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

High Pressure Research Pub Date : 2021-04-03 DOI:10.1080/08957959.2021.1924702

I. Korobeynikov, A. Y. Usik, T. E. Govorkova, S. Emelyanova, V. Marchenkov

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引用次数: 1

Abstract

ABSTRACT The Heusler alloys are promising material for various applications, including thermoelectric power generators. There are several ways to improve their properties, among which the substitution of constituent elements, nanostructuring, temperature treatment, thin films engineering etc. This work is devoted to the experimental study of thermoelectric properties of Fe–V–Al-based Heusler alloys with different compositions under high pressure. The Seebeck coefficient and electrical resistance of several compounds were measured as a function of applied pressure up to 10 GPa at room temperature. The experimental results demonstrated a diversity of pressure responses of the thermoelectric properties that can be observed in chemically similar Heusler alloys under variation in their compositions. Moderate enhancing of the thermoelectric power factor, S 2/r (where S is the Seebeck coefficient and r is the electrical resistivity) was observed in Fe-rich Fe2.1V0.91Al0.99 compound at a pressure about ∼1 GPa. It was found that all alloys with weak deviation from stoichiometric composition had a feature in their S (P) pressure behavior at P∼2 GPa which could be related to semimetal-metal phase transition.

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高压下非化学计量Fe–V–Al全Heusler合金的热电性能

摘要赫斯勒合金是一种很有前途的材料，可用于各种应用，包括热电发电机。有几种方法可以改善它们的性能，其中包括成分的替代、纳米结构、温度处理、薄膜工程等。本工作致力于对不同成分的Fe–V–Al基Heusler合金在高压下的热电性能进行实验研究。测量了几种化合物的塞贝克系数和电阻，作为施加压力的函数，最高可达10 室温下的GPa。实验结果表明，在化学相似的赫斯勒合金中，在其成分变化的情况下，可以观察到热电性能的压力响应的多样性。在大约~1的压力下，在富含Fe的Fe2.1V0.91Al0.99化合物中观察到热电功率因数S2/r（其中S是塞贝克系数，r是电阻率）的适度增强 GPa。研究发现，所有与化学计量成分偏差较小的合金在P～2时都具有S（P）压力行为的特征 GPa可能与半金属-金属相变有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Pressure Research 物理-物理：综合

CiteScore

3.80

自引率

5.00%

发文量

审稿时长

2 months

期刊介绍： High Pressure Research is the leading journal for research in high pressure science and technology. The journal publishes original full-length papers and short research reports of new developments, as well as timely review articles. It provides an important forum for the presentation of experimental and theoretical advances in high pressure science in subjects such as: condensed matter physics and chemistry geophysics and planetary physics synthesis of new materials chemical kinetics under high pressure industrial applications shockwaves in condensed matter instrumentation and techniques the application of pressure to food / biomaterials Theoretical papers of exceptionally high quality are also accepted.