Preparation of DyFe_2 and TbFe_2 by Reduction-Diffusion Process  

作　　者：GuangsiGUO GuangtaiWANG ZhitongSUI 

机构地区：[1]DepartmentofMaterialsScienceandEngineering,ShenyangInstituteofTechnology,Shenyang110016,China [2]SchoolofMaterialsandMetallurgy,NortheasternUniversity,Shenyang110004,China

出　　处：《Journal of Materials Science & Technology》2004年第1期68-70,共3页材料科学技术（英文版）

摘　　要：The pure intermetallic compounds (Tb1-x;Dyx)Fe2 are super-magnetostriction materials, which were produced from DyFe2 and TbFe2 in this paper. The thermodynamic possibility and kinetic feasible conditions for DyFe2 and TbFe2 preparation by reduction-diffusion in Ca-Dy2O3-Fe and Ca-Tb4O7-Fe systems were analyzed and the products of DyFe2 and TbFe2 were confirmed by XRD. The contracting core model was applied to describe the reduction-diffusion process in which the diffusion is a rate-controlled step. The apparent activation energies of DyFe2 and TbFe2 processes are 45 and 39 kJ/mol respectively.The pure intermetallic compounds (Tb1-x;Dyx)Fe2 are super-magnetostriction materials, which were produced from DyFe2 and TbFe2 in this paper. The thermodynamic possibility and kinetic feasible conditions for DyFe2 and TbFe2 preparation by reduction-diffusion in Ca-Dy2O3-Fe and Ca-Tb4O7-Fe systems were analyzed and the products of DyFe2 and TbFe2 were confirmed by XRD. The contracting core model was applied to describe the reduction-diffusion process in which the diffusion is a rate-controlled step. The apparent activation energies of DyFe2 and TbFe2 processes are 45 and 39 kJ/mol respectively.

关 键 词：Ca-Dy2O3 -Fe Ca-Tb4O7-Pe Reduction-diffusion DyFe2 TbFe2 Contracting core model 

分 类 号：TB331[一般工业技术—材料科学与工程]