Gd3Co29-xCrx新相化合物的结构与磁性

制备出具有室温单轴磁晶各向异性的非间隙型Co基Gd3Co29-xCrx化合物(x=65和70)，x射线衍射和磁性测量表明所有单相化合物均属于单斜晶系，Nd3(Fe,Ti)29型结构和A2/m空间群.Gd3Co29-xCrx化合物的居里温度在x=65时为412 K，x=70时为359 K. Gd3Co29-xCrx化合物在x=65 时磁化强度随温度的变化曲线表明，在居里温度以下的某一温度处有一补偿点，在补偿点处求得晶格分子场系数nRT=33 T f.u./μB.关键词：Gd3Co29-xCrx化合物x射线衍射磁晶各向异性

Structural and magnetic properties of Gd3 Co29-xCrx compounds

The novel Co-based Gd3Co29-xCrx compounds with a Nd3(Fe,Ti)29-type structure have been synthesized successfully for x=65 and 70 The crystal structure and magnetic properties of the Gd3Co29-xCrx compounds have been investigated by x-ray diffraction analysis and magnetic measurements. It has been found that Gd3(Co,Cr)29 with x=65 and 70 are ferrimagnetic with the Curie temperature of 412 K for x=65 and 359 K for x=70. Temperature dependence of magnetization shows a compensation point of the magnetization at a certain temperature below Curie point. The intersublattice molecular field coefficient, nRT, was derived to be 33 T f.u./μB for Gd3Co225Cr65 on the basis of the magnetization curve at the compensation temperature. It is noteworthy that the Gd3(Co,Cr)29 compounds exhibit a favourable easy-axis anisotropy in the whole temperature range below the Curie temperature.