Investigation on structural and magnetocaloric properties of LaFe13-xSix(H,C)y compounds
Investigation on structural and magnetocaloric properties of LaFe13-xSix(H,C)y compounds
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DOI：
10.1016/j.jssc.2015.10.016
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Bessais, L.
中科院分区：
文献类型：
--
作者：
Phejar, M.;Paul-Boncour, V.;Bessais, L.
本研究的第一部分致力于LaFe 13-xSixHy晶体。采用高能球磨法制备了金属间化合物母合金。使用Sievert装置通过固/气反应进行H原子的插入。它们的热力学性质显示出非常快的动力学吸收在298 K下10巴取决于Si含量。结合磁性测量的结构结果可以解释居里温度的磁体积效应。本研究的第二部分致力于LaFe 13-xSixCy碳化物。它们是通过金属间化合物粉末与蒽的固/固反应合成的。它们的结构以及磁热性能进行了研究。进一步的结构和磁性的结果进行了中子衍射。进行了完整的晶体学表征。测定了晶胞参数和铁磁矩随温度的变化。澄清了对间隙部位的误解。(C)由Elsevier Inc.出版。
The first part of this study is devoted to LaFe13-xSixHy hydrides. The parent intermetallic alloys were synthesized by high energy ball milling. The insertion of H atoms was carried out by solid/gas reaction using a Sievert apparatus. Their thermodynamic properties show a very fast kinetic absorption at 298 K under 10 bars depending on Si content. The structural results combined with magnetic measurements allow to explain the magnetovolumic effect on the Curie temperature. The second part of this study is dedicated to LaFe13-xSixCy carbides. They were synthesized by solid/solid reaction between the inter metallic powder and the anthracene. Their structural as well as magnetocaloric properties were investigated. Further structural and magnetic results were carried out by neutron diffraction. A complete crystallographic characterization was made. The cell parameter and the Fe magnetic moments versus temperature were determined. Moreover, the misunderstanding on interstitial site was clear up.) (C) 2015 Published by Elsevier Inc.