Nd2(Co1-xFex)17-yCry化合物的结构和磁性研究

利用X射线衍射和磁性测量研究Nd₂(Co_1-xFe_x)_17-yCr_y化合物的结构和磁性. 实验结果表明, 这些化合物都具有Th₂Zn₁₇型结构, Cr和Fe替代Nd₂Co ₁₇化合物中Co并未改变晶体结构, 但能引起晶格膨胀. 所有化合物在室温下都表现为易面各向异性. 化合物的居里温度随着Fe含量的增加和稳定元素Cr含量的减小而升高, 在x=0.5和y=3.3时达到最大值, 而后逐渐减小.

A Studies of Structure and Magnetic Properties of Compounds Nd2(Co1-xFex)17-yCry

The structure and magnetic properties of compounds Nd₂(Co_1-xFe_x)_17-yCr_y were investigated by means of X-ray diffraction and magnetic measurements. It was found that all the compounds investigated are of the Th₂Zn17-type structu re. The substitution of Cr and Fe for Co doesnt change the crystalline structu re, but leads to an increase of the unit-cell volume. The X-ray diffraction patt erns of the magnetically aligned powder samples indicate that the easy magnetiza tiondirections (EMD) at room temperature are in the basal plane for all Nd₂(Co_1-xFe_x) _17-xCr_y compounds. With increasing content Fe and de creasing Cr content, the Curie temperature T_C increases first, reachi ng a maximum at x=0.5 and y=3.3, then decreases monotonically.