Mn1.2Fe0.8P0.74Ge0.26-xSex化合物磁热性能研究*
王少博, 男, 1986年生, 硕士生
修回日期: 2014-01-27
网络出版日期: 2014-09-25
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
RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn1.2Fe0.8P0.74Ge0.26-xSex COMPOUNDS
Revised date: 2014-01-27
Online published: 2014-09-25
Supported by
Supported by National Natural Science Foundation of China (Nos.51071007 and 51171003) and Key Research Project of Beijing Municipal Commission of Education (No.KZ201410005005)
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Mn1.2Fe0.8P0.74Ge0.26-xSex (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Tc成一定对应关系, c/a减小会升高Tc, 反之则降低Tc. 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Tc升高, 转变温区?Tcoex变窄, 绝热温变?Tad增大; 而热滞?Thys和熵变?SDSC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, Tc升高了5.6 K, ?Tcoex降低了10.6%, ?Tad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.
王少博 , 刘丹敏 , 肖卫强 , 张振路 , 岳明 , 张久兴 . Mn1.2Fe0.8P0.74Ge0.26-xSex化合物磁热性能研究*[J]. 金属学报, 2014 , 50(9) : 1109 -1114 . DOI: 10.11900/0412.1961.2014.00059
Magnetic refrigeration based on the magnetocaloric effect offers a potential energy saving, atmosphere friendly way to replace vapor-compression refrigeration. In this work, Mn1.2Fe0.8P0.74Ge0.26-xSex (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 Mn1.2Fe0.8P0.74Ge0.26-xSex 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 (Tc) 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 Mn1.2Fe0.8P0.74Ge0.26-xSex compounds leads to higher Tc, narrower temperature range of the two-phase coexistence (?Tcoex) and larger adiabatic temperature change (?Tad), in addition the thermal hysteresis (?Thys) and entropy change (?SDSC) remain almost unaffected. 0.01 Se substitution leads to 5.6 K increase in Tc, 10.6% decrease in ?Tcoex, and 10% increase in ?Tad. With a further increase in Se content, magnetocaloric properties of compound decrease.
Key words： MnFePGeSe; magnetocaloric effect; magnetic phase transition
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