论文部分内容阅读
LaCo_(13) has the highest 3d metal content,of any known rare-earth intermetallic compounds,a1.03MA/m saturation magnetization at room temperature and a high T_c(1318K).Unfortunately.it is cubic,lacking of the necessary anisotropy.thus diminishing the chance that it will be used as a permanent magnetic material.In this paper,the structure and magnetic properties of LaCo_(13-x)Six(x = 2,4)and LaCo_(13-x)Ge_x(x = 2,2.5,3,4)intermetallic compounds have been studied.The crystal structure was found to be tetragonal when x = 4 for LaCo_(13-x)Si_x and x = 3,4 for LaCo_(13-x)Gex,but the difference between the lattice parameters a and c is very small.In order to gain the tetragonal structure,the annealing temperature of LaCo_(13-x)Ge_x must be controlled strictly.The magnetic measurement results show that the Curie temperatures of all these compounds are high,but the saturation magnetization at room-temperature decreases greatly with x increasing.
LaCo_ (13) has the highest 3d metal content, of any known rare earth intermetallic compounds, a 1.03 MA / m saturation magnetization at room temperature and a high T_c (1318K). Unfortunately, it is cubic, lacking of the necessary anisotropy. which diminishing the chance that it will be used as a permanent magnetic material. In this paper, the structure and magnetic properties of LaCo_ (13-x) Six (x = 2,4) and LaCo_ (13-x) Ge_x 2,2.5,3,4) intermetallic compounds have been studied. The crystal structure was found to be tetragonal when x = 4 for LaCo_ (13-x) Si_x and x = 3,4 for LaCo_ (13-x) Gex, but the difference between the lattice parameters a and c is very small. In order to gain the tetragonal structure, the annealing temperature of LaCo_ (13-x) Ge_x must be controlled strictly. The magnetic measurement results show that the Curie temperatures of all these compounds are high, but the saturation magnetization at room-temperature decreases greatly with x increasing.