Good comprehensive performance of Laves phase Hf1-xTaxFe2 as negative thermal expansion materials

被引：79

作者：

Li, L. F. ^{[1
,2
]}

Tong, P. ^{[1
,2
]}

Zou, Y. M. ^{[3
]}

Tong, W. ^{[3
]}

Jiang, W. B. ^{[1
]}

Jiang, Y. ^{[1
]}

Zhang, X. K. ^{[1
,2
]}

Lin, J. C. ^{[1
]}

Wang, M. ^{[1
]}

Yang, C. ^{[1
,2
]}

Zhu, X. B. ^{[1
]}

Song, W. H. ^{[1
]}

Sun, Y. P. ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China

[2] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[3] Chinese Acad Sci, High Magnet Field Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Anhui, Peoples R China

来源：

ACTA MATERIALIA | 2018年 / 161卷

基金：

中国国家自然科学基金;

关键词：

Laves phases; Negative thermal expansion; Electron spin resonance; Thermal conductivity; Young's modulus; MECHANICAL-PROPERTIES; TRANSPORT-PROPERTIES;

D O I：

10.1016/j.actamat.2018.09.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Negative thermal expansion (NTE) materials can compensate for the normal positive thermal expansion (PTE) of most materials, and thus have great potential applications. Itinerant magnetic Laves phase compounds Hf1-xTaxFe2 with x similar to 0.16-0.22 exhibit an abrupt volume shrink as large as Delta V/V similar to 1% at the ferromagnetic (FM) to antiferromagnetic phase transition. Here we report that by reducing the Ta concentration the sharp volume change was gradually modified to a continuous one and moved to room temperature. NTE was optimized in x = 0.13, showing a linear NTE coefficient as large as - 16.3 ppm/K over a broad window of 105 K (222 K - 327 K). As revealed by Electron Spin Resonance, the broadened NTE window is closely coupled with the asynchronous FM orderings of Fe moments at 6h and 2a Fe sites. In addition to good mechanical properties (i.e., Young's modulus, compressive strength and Vickers hardness), their thermal and electrical conductivities are superior to other metallic NTE materials, suggesting their wide applications as PTE compensators. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：258 / 265

页数：8

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