Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of singl...Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of single phase with the rhombohedra1 Th_(2)Zn_(17),type structure.The substitution of Si for Co leads to an approximately linear decrease in the unit cell volume.The saturation moment at 1.5 K decreases linearly with increasing Si concentration,being an approximately linear rate of about 4.1μB per substituted Si.The Curie temperature of Gd_(2)Co_(17-x)Si_(x) is found to decrease monotonously from 1213 to 651 K,as x increases from 0 to 3.X-ray diffraction measurements on magnetically aligned powders show that the easy magnetization direction of Gd_(2)Co_(17-x)Si_(x) compounds changes from basal plane to c-axis with increasing Si concentcation.The samples with x=2,3 exhibit a room temperature uniaxial anisotropy.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.59525101。
文摘Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of single phase with the rhombohedra1 Th_(2)Zn_(17),type structure.The substitution of Si for Co leads to an approximately linear decrease in the unit cell volume.The saturation moment at 1.5 K decreases linearly with increasing Si concentration,being an approximately linear rate of about 4.1μB per substituted Si.The Curie temperature of Gd_(2)Co_(17-x)Si_(x) is found to decrease monotonously from 1213 to 651 K,as x increases from 0 to 3.X-ray diffraction measurements on magnetically aligned powders show that the easy magnetization direction of Gd_(2)Co_(17-x)Si_(x) compounds changes from basal plane to c-axis with increasing Si concentcation.The samples with x=2,3 exhibit a room temperature uniaxial anisotropy.
