Mn1.2Fe0.8P0.74Ge0.26-xSex化合物磁热性能研究*

doi:10.11900/0412.1961.2014.00059

金属学报

2014, Vol. 50

Issue (9): 1109-1114 DOI: 10.11900/0412.1961.2014.00059

本期目录 | 过刊浏览

Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x化合物磁热性能研究^*

王少博¹, 刘丹敏¹(

), 肖卫强¹, 张振路¹, 岳明², 张久兴²

1 北京工业大学固体微结构与性能研究所, 北京 100124
2 北京工业大学材料科学与工程学院, 北京 100124

RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x COMPOUNDS

WANG Shaobo¹, LIU Danmin¹(

), XIAO Weiqiang¹, ZHANG Zhenlu¹, YUE Ming², ZHANG Jiuxing²

1 Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124
2 College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

引用本文:

王少博, 刘丹敏, 肖卫强, 张振路, 岳明, 张久兴. Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x化合物磁热性能研究^*[J]. 金属学报, 2014, 50(9): 1109-1114.
Shaobo WANG, Danmin LIU, Weiqiang XIAO, Zhenlu ZHANG, Ming YUE, Jiuxing ZHANG. RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x COMPOUNDS[J]. Acta Metall Sin, 2014, 50(9): 1109-1114.

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摘要:

利用机械合金化 (MA) 结合放电等离子烧结 (SPS) 技术, 成功制备了Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.005, 0.01, 0.015, 0.02, 0.03) 化合物, 并采用XRD, DSC, 振动样品磁强计 (VSM) 和磁热效应直接测量仪等手段对其晶体结构、相变过程以及磁热性能进行了研究. 结果表明: 该系化合物均具有六方Fe₂P结构. 随着Se含量的增加, 晶格常数a和c都发生了明显的变化, c/a先减小, 然后保持不变, 最后又增大; 且c/a的值与化合物的Curie温度T_c成一定对应关系, c/a减小会升高T_c, 反之则降低T_c. 外加磁场和温度的变化都能引起化合物产生一级磁热相变, 即顺磁相 (PM) ? 铁磁相 (FM). 少量Se对Ge的置换 (x≤0.015) 能够提高材料的磁热性能, 使该系化合物的T_c升高, 转变温区?T_coex变窄, 绝热温变?T_ad增大; 而热滞?T_hys和熵变?S_DSC基本不变. 当x=0.01时, 化合物的磁热性能最好, 与x=0化合物相比, T_c升高了5.6 K, ?T_coex降低了10.6%, ?T_ad增加了10%, 当Se含量继续增加时, 化合物的磁热性能有所下降.

关键词 ： MnFePGeSe, 磁热效应, 磁相变

Abstract：

Magnetic refrigeration based on the magnetocaloric effect offers a potential energy saving, atmosphere friendly way to replace vapor-compression refrigeration. In this work, Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.005, 0.01, 0.015, 0.02, 0.03) compounds were prepared by mechanical milling and subsequent spark plasma sintering (SPS) technique, their crystal structures, phase transition process and magnetocaloric properties were investigated by XRD, DSC, VSM and direct measurement equipment of magnetocaloric effect. The results show that the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds possess a hexagonal Fe₂P-type crystal structure. With increasing Se concentration, the lattice parameters a and c change significantly. It causes c/a ratio decreases firstly, keeps unchanging and followed by increasing again. And the Curie temperature (T_c) of the compounds is increased with the decrease of the c/a ratio. Either applied magnetic field or temperature change can induce the magnetic transformation between the paramagnetic phase and ferromagnetic phase. Low substitution of Se for Ge (x≤0.015) in the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds leads to higher T_c, narrower temperature range of the two-phase coexistence (?T_coex) and larger adiabatic temperature change (?T_ad), in addition the thermal hysteresis (?T_hys) and entropy change (?S_DSC) remain almost unaffected. 0.01 Se substitution leads to 5.6 K increase in T_c, 10.6% decrease in ?T_coex, and 10% increase in ?T_ad. With a further increase in Se content, magnetocaloric properties of compound decrease.

Key words： MnFePGeSe magnetocaloric effect magnetic phase transition

ZTFLH:

TM271

基金资助:* 国家自然科学基金项目51071007和51171003以及北京市教委科研计划重点项目KZ201410005005资助

作者简介: null

王少博, 男, 1986年生, 硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00059 或 https://www.ams.org.cn/CN/Y2014/V50/I9/1109

图1 Mn1.2Fe0.8P0.74Ge0.26-xSex化合物的XRD谱

表1 Mn1.2Fe0.8P0.74Ge0.26-xSex化合物在333 K的晶格常数和磁热性能

图2 Mn1.2Fe0.8P0.74Ge0.26-xSex化合物的DSC曲线和熵变曲线

图3 Mn1.2Fe0.8P0.74Ge0.26-xSex (x=0, 0.01) 化合物在降温过程中的顺磁相含量

图4 Mn1.2Fe0.8P0.74Ge0.26-xSex化合物的等温磁化曲线

图5 Mn1.2Fe0.8P0.74Ge0.26-xSex (x=0, 0.01) 化合物在0到1, 2和3 T磁场下的磁熵变曲线

图6 Mn1.2Fe0.8P0.74Ge0.26-xSex (x=0, 0.01) 化合物在0~1.5 T的外加磁场下的绝热温变曲线

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