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(Mn1-xFex)5Sn3合金晶體結(jié)構(gòu)和居里溫度
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Crystal Structure and Curie Temperature of (Mn1-xFex)5Sn3 Alloy
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    摘要:

    用粉末冶金法(磁場壓制燒結(jié))制備(Mn1-xFex)5Sn3(x=0.1~0.5)合金，對其晶體結(jié)構(gòu)、居里溫度進(jìn)行研究。室溫XRD分析表明，該系列合金均保持Mn5Sn3的InNi2型相結(jié)構(gòu)，計算發(fā)現(xiàn)合金的晶格常數(shù)隨著x量增大而減小。通過M-T曲線測量結(jié)果表明：居里溫度TC在室溫附近244~391 K連續(xù)可調(diào)，且隨著Fe含量的增加而提高，居里溫度隨成分近似呈線性變化；成分為(Mn0.70Fe0.30)5Sn3合金的居里溫度為295 K，在外加磁場為0~1.5 T下，最大磁熵變約為0.87 J·(kg·K)-1，是一種成本低廉的室溫磁制冷候選材料。

    Abstract:

    (Mn1-xFex)5Sn3 (x=0.1-0.5) alloys were prepared by powder metallurgy method with magnetic field pressing and sintering. The crystal structure, Curie temperature and magnetic entropy change of the alloys were studied. XRD patterns reveal that all samples of this system maintain a hexagonal InNi2-type structure with space group P63/mmc. The lattice parameter and cell volumes of the (Mn1-xFex)5Sn3 alloys decrease with x increasing by calculation, while the Curie temperature of these alloys increases almost linearly and is tunable continually from 244 K to 391 K by M-T curves. The Curie temperature of (Mn0.70Fe0.30)5Sn3 is about 295 K close to room temperature, and the maximum magnetic entropy change is 0.87 (kg·K)-1 with a field change from 0 to 1.5 T. The curve of magnetic entropy change of (Mn0.70Fe0.30)5Sn3 is flat in a wide temperature range. It is indicated that the (Mn1-xFex)5Sn3 alloy is a suitable candidate with low cost for Ericsson cycle.

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張 鵬,侯雪玲,胡星浩,徐 暉,倪建森,周邦新.(Mn1-xFex)5Sn3合金晶體結(jié)構(gòu)和居里溫度[J].稀有金屬材料與工程,2010,39(3):549~551.[Zhang Peng, Hou Xueling, Hu Xinghao, Xu Hui, Ni Jiansen, Zhou Bangxin. Crystal Structure and Curie Temperature of (Mn1-xFex)5Sn3 Alloy[J]. Rare Metal Materials and Engineering,2010,39(3):549~551.]
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  • 收稿日期:2009-09-06
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