Microstructure, magnetic and magnetocaloric properties of Fe<sub class="a-plus-plus">2–x sub>Mn<sub class="a-plus-plus"> x sub>P<sub class="a-plus-plus">0.4sub>Si<sub class="a-plus-plus">0.6sub> alloys
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- 作者：Yaoxiang Geng ; Zhijie Zhang ; Ojied Tegus ; Chuang Dong…
- 关键词：Fe2–xMnxP0.4Si0.6 alloys ; microstructure ; thermal hysteresis ; magnetic ; entropy change ; adiabatic temperature change
- 刊名：Science China Materials
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：59
- 期：12
- 页码：1062-1068
- 全文大小：3014KB
- 刊物类别：Materials Science, general; Chemistry/Food Science, general;
- 刊物主题：Materials Science, general; Chemistry/Food Science, general;
- 出版者：Science China Press
- ISSN：2199-4501
- 卷排序：59
文摘
The present work is devoted to investigating the microstructure, magnetism and magnetocaloric effects of Si- and Mn-rich FeMn(P,Si) alloys. The Mn-substituted alloys with Fe<sub>2–xsub>Mn<sub>xsub>P<sub>0.4sub>Si<sub>0.6sub> (x = 1.25, 1.30, 1.35, 1.40, 1.45 and 1.50) were prepared by high-energy ball milling and solid-state reaction. Experimental results show that the alloys crystallized into a majority Fe<sub>2sub>P-type hexagonal structure, coexisting with minor amounts of (Mn,Fe)<sub>3sub>Si and (Mn,Fe)<sub>5sub>Si<sub>3sub> phases. The Curie temperature decreased linearly from 321 to 266 K with increasingMn content from1.25 to 1.50 in Fe<sub>2–xsub>Mn<sub>xsub>P<sub>0.4sub>Si<sub>0.6sub> alloys. The first-order magnetic phase transition became weakened and the second-order magnetic phase transition became dominated with increasing Mn content. Fe<sub>0.75sub>Mn<sub>1.25sub>P<sub>0.4sub>Si<sub>0.6sub> alloy presents a maximum isothermal magnetic-entropy changes of 7.2 J (kg K)–1 in a magnetic field change of 0–1.5 T. The direct measurement shows that Fe0.7Mn1.3P0.4Si0.6 and Fe<sub>0.65sub>Mn<sub>1.35sub>P<sub>0.4sub>Si<sub>0.6sub> alloys exhibit a maximum adiabatic temperature change of 1.8 K in a magnetic field change of 0–1.48 T. The thermal hysteresis for all alloys is less than 4 K. These experimental results reveal that Fe<sub>2–xsub>Mn<sub>xsub>P<sub>0.4sub>Si<sub>0.6sub> alloys could be a candidate material for magnetic refrigeration.