Zero Thermal Expansion Achieved by an Electrolytic Hydriding Method in La(Fe, Si)13 Compounds
Zero Thermal Expansion Achieved by an Electrolytic Hydriding Method in La(Fe, Si)13 Compounds
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La(Fe,Si) 13 化合物电解氢化法实现零热膨胀
DOI：
10.1002/adfm.201604195
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发表时间：
2017-02-01
影响因子：
19
通讯作者：
Li, Laifeng
中科院分区：
文献类型：
--
作者：
Li, Shaopeng;Huang, Rongjin;Li, Laifeng
La（Fe，Si）13基化合物是近年来发展起来的一种新型负热膨胀材料，具有大的、各向同性的、非滞后的负热膨胀性能以及较高的导电和导热性能。本文采用一种新的电解沉积法制备了La（Fe，Si）13纳米晶。利用变温X射线衍射和物性测量系统研究了La（Fe，Si）13纳米晶的热膨胀和磁性能。令人着迷的是，发现电解退火后，室温NTE性能和零热膨胀（ZTE）性能与宽的操作温度窗口（20-275 K）已经实现。进一步的磁性能结合理论分析表明，La（Fe，Si）13纳米晶的NTE和ZTE性能的改善是由于氢化后磁交换耦合的变化。目前的研究结果突出了La（Fe，Si）13的潜在应用，具有室温NTE和宽操作温度窗口ZTE性能。
The La(Fe, Si) 13-based compounds have been recently developed as promising negative thermal expansion (NTE) materials by elemental substitution, which show large, isotropic and nonhysteretic NTE properties as well as relatively high electrical and thermal conductivities. In this paper, the La(Fe, Si) 13 hydrides are prepared by a novel electrolytic hydriding method. Furthermore, the thermal expansion and magnetic properties of La(Fe, Si) 13 hydrides are investigated by the variable-temperature X-ray diffraction and physical property measurement system. Fascinatingly, it is found that room-temperature NTE properties and zero thermal expansion (ZTE) properties with broad operation-temperature window (20-275 K) have been achieved after electrolytic hydriding. The further magnetic properties combined with theoretical analysis reveal that the improvements of NTE and ZTE properties in the La(Fe, Si) 13 hydrides are ascribed to the variations of magnetic exchange couplings after hydrogenation. The present results highlight the potential applications of La(Fe, Si) 13 hydrides with room-temperature NTE and broad operation-temperature window ZTE properties.