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采用高能球磨法制备了Mn_(1.0)Fe_(0.9-x)Cr_xP_(0.5)Si_(0.5)(x=0,0.02,0.04,0.06,0.08,0.10(原子分数))和Mn_(1.0-x)Cr_xFe_(0.9)P_(0.5)Si_(0.5)(x=0,0.02,0.04,0.06,0.08(原子分数))两个系列化合物。利用X射线衍射和磁性测量技术研究了材料的晶体结构,磁性和磁热效应,研究结果表明:两个系列化合物均结晶为Fe_2P型六角结构,空间群为P62 m。通过调整Cr元素的掺杂量,可将该磁热材料的居里温度调节在155~375K范围。随Cr含量增加,化合物的最大磁熵变逐渐变小,但等温磁熵变随温度变化曲线的半峰宽变宽,相对制冷能力变大。
The Mn_ (1.0) Fe_ (0.9-x) Cr_xP_ (0.5) Si_ (0.5) (x = 0,0.02,0.04,0.06,0.08,0.10 (atomic fraction)) and Mn_ (1.0-x) Cr_xFe_ (0.9) P_ (0.5) Si_ (0.5) (x = 0,0.02,0.04,0.06,0.08 (atomic fraction)) two series of compounds. The crystal structure, magnetism and magnetocaloric effect of the materials were studied by X-ray diffraction and magnetic measurement. The results show that both series of compounds crystallize into hexagonal Fe_2P structure with P62 m space group. By adjusting the doping amount of Cr element, the Curie temperature of the magnetocaloric material can be adjusted in the range of 155K to 375K. With the increase of Cr content, the maximum magnetic entropy change of the compound becomes smaller, but the half-width of the isothermal magnetic entropy change with temperature curve broadens, the relative cooling capacity becomes larger.