MnFeP0.63Ge0.12Si0.25Bx (x=0, 0.01, 0.02, 0.03)化合物的磁热效应

金属学报, 2011, 47(3): 344-348. doi: 10.3724/SP.J.1037.2010.00566

MnFeP_0.63Ge_0.12Si_0.25B_x (x=0, 0.01, 0.02, 0.03)化合物的磁热效应

内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室, 呼和浩特 010022

Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University,Hohhot 010022>

基金项目: 国家自然科学基金项目50961010, 内蒙古自然科学基金项目20080404ZD09和内蒙古师范大学研究生科研创新基金项目CXJJS10034资助

关键词：磁热效应 , thermal hysteresis , Curie temperature , phase transition

MAGNETOCALORIC EFFECT IN MnFeP_0.63Ge_0.12Si_0.25B_x (x=0, 0.01, 0.02, 0.03) COMPOUNDS

WANG Dongmei SONG Lin WANG Yaohui ZHANG Wei Bilige Tegus O

Keywords： magnetocaloric effect , 热滞 , Curie温度 , 相变

对MnFeP_0.63Ge_0.12Si_0.25B_x (x=0, 0.01, 0.02, 0.03, 原子分数)化合物的结构和磁热效应(MCE)进行了研究. XRD分析结果表明:MnFeP_0.63Ge_0.12Si_0.25B_x (x=0, 0.01, 0.02, 0.03)的主相均为Fe₂P型六角结构, 空间群为P62m. 随着B含量的增加晶格常数a增大c减小,晶胞体积基本保持不变. 磁性测量表明: 随着B含量由0增加到0.03时, Curie温度(T_C)从300 K升到347 K, 热滞分别为20, 17, 11和6 K. 0-1.5 T外磁场下最大磁熵变Δ S_M分别为14.83, 11.41, 11.26 和11.8 J/(kg?K).

Structural and magnetocaloric properties of the MnFeP_0.63Ge_0.12Si_0.25B_x (x=0,0.01, 0.02, 0.03, atomic fraction) compounds have been inestigated. XRD result shows that the MnFeP_0.63Ge_0.12Si_0.25B_x (x=0, 0.01, 0.02, 0.03) compounds mainly consist of the Fe₂P–typhxagonal structure phase with space group P¯62m. It is fond that the lattice paraeter a increases and the lattice parameter c slighly decreases with increasing x, and the unit celvolume does not change. The agnetic measurements show that the Curie temperature increases from 300 K to 347 K, and thermal hysteresis are 20, 17, 11 and 6 K for x= 0 to 0.03. The aximm values of the magnetic entropy chage are 11.1, 11.26 and 11.8 J/(kg·K), respectively, or 0—1.5 T fields.

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