中国物理B ›› 2004, Vol. 13 ›› Issue (7): 1134-1138.doi: 10.1088/1009-1963/13/7/030
李养贤1, 沈俊2, 王芳3, 王光军3, 张绍英3
Shen Jun (沈俊)ab, Li Yang-Xian (李养贤)a, Wang Fang (王芳)b, Wang Guang-Jun (王光军)b, Zhang Shao-Ying (张绍英)b
摘要: Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe_{11.83}Si_{0.94}Al_{0.23} compounds has been investigated by means of magnetization measurements. X-ray diffraction shows the prepared compounds to be single phase with the cubic NaZn_{13}-type structure. Substitution of Co for Fe leads to an increase of Curie temperature of the material. The magnetic entropy changes in LaFe_{11.83}Si_{0.94}Al_{0.23} and LaFe_{11.03}Co_{0.80}Si_{0.94}Al_{0.23} compounds are 21.8J/(kg·K) to 16.9J/(kg·K) under a magnetic field change of 0-5T at Curie temperature, respectively. Giant magnetic entropy changes are attributed to the higher magnetization and the rapid change in magnetization at Curie temperature.
中图分类号: (Magnetic impurity interactions)