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...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.展开更多
The pure TbFe 2 is a sort of intermetallic compound to produce (TbDy)Fe 2. It has important practical meanings to develop a new method for producing pure TbFe 2 directly from Tb 4O 7 with low cost and non pollu...The pure TbFe 2 is a sort of intermetallic compound to produce (TbDy)Fe 2. It has important practical meanings to develop a new method for producing pure TbFe 2 directly from Tb 4O 7 with low cost and non pollution. Based on our previous thermodynamic study on the production of TbFe 2 by reduction diffusion in Ca Tb 4O 7 Fe system, kinetics has been further studied in this work. It is confirmed that the product is TbFe 2 by means of XRD. The contracting core model is applied. The reactions are found to be diffusion controlled. The apparent activation energy of TbFe 2 is 39 kJ·mol -1 .展开更多
文摘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.
文摘The pure TbFe 2 is a sort of intermetallic compound to produce (TbDy)Fe 2. It has important practical meanings to develop a new method for producing pure TbFe 2 directly from Tb 4O 7 with low cost and non pollution. Based on our previous thermodynamic study on the production of TbFe 2 by reduction diffusion in Ca Tb 4O 7 Fe system, kinetics has been further studied in this work. It is confirmed that the product is TbFe 2 by means of XRD. The contracting core model is applied. The reactions are found to be diffusion controlled. The apparent activation energy of TbFe 2 is 39 kJ·mol -1 .
