Controllable negative thermal expansion in NaZn13-type La(Fe, Co, Al)13 compounds

被引：5

作者：

Sun, Wentao ^{[1
,2
]}

Zhang, Hua ^{[1
]}

Li, Wen ^{[1
]}

Huang, Rongjin ^{[1
,2
]}

Zhao, Yuqiang ^{[1
]}

Wang, Wei ^{[3
]}

Li, Laifeng ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Cryogen, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

来源：

AIP ADVANCES | 2020年 / 10卷 / 07期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

COEFFICIENT; TRANSITION; ANOMALIES; HEAT;

D O I：

10.1063/5.0010204

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Control of negative thermal expansion (NTE) is of great importance for various applications of NTE materials. Here, we report an effective way to control both the coefficient of thermal expansion (CTE) and NTE temperature-window in NaZn13-type La(Fe, Co, Al)(13) compounds by Al and Co substitutions. Experiments show that the average CTE decreases with the increase in Al content. Besides, the NTE temperature-window shifts toward higher temperature due to Co doping. Further studies of magnetic characterizations reveal that the CTE is strongly correlated with the square of the spontaneous magnetization M-s(2)(T). Moreover, the NTE temperature-window is influenced by the density of 3d electrons at the Fermi level and the Fe-I-Fe-II magnetic exchange interactions. This effective way demonstrated in this work to achieve controllable NTE indicates the potentials in practical applications for NTE materials.

引用

页数：6

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