摘要
在353K的乙酰胺 尿素 NaBr熔体中,Co(Ⅱ)一步不可逆还原为金属Co,测得α为0.23和D0为1.25×10-6cm2·s-1;Tb(Ⅲ)不能单独还原为Tb,但是可以被Co2+诱导而共沉积。由恒电位电解法得到非晶态的Tb Co合金;Tb的含量随阴极电位的负移、Tb3+ Co2+摩尔比增大及电解时间延长而增大,Tb的最大含量可达83.91wt%。Tb Co合金膜经高温晶化后用X射线衍射分析其组成为(TbCo3)12R。
Electroreduction of Co^(2+) to Co in acetamide-urea-NaBr melt at 353 K is irreversible in one step. The α and the D_0 were determined as 0.23 and 1.25×10^(-6) cm^2·s^(-1). Tb^(3+) is not reduced to Tb alone,but can be inductively codeposited with Co^(2+). The amorphous Tb-Co alloy films were obtained by potentiostatic electrolysis. The content of Terium in the Terium-Cobalth deposits changes with the cathode potential, molar ratio of Tb^(3+)/Co^(2+) and the electrolysis time and can reach 83.91 wt%. Crystalline (TbCo_3)12R alloy is obtained after heat treatment of the deposit.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第5期584-588,共5页
Journal of the Chinese Society of Rare Earths
基金
教育部高等学校重点实验室访问学者基金资助项目(01 079 314101)
