直接熔盐电化学还原固态Tb4O7-Fe2O3制备Tb2Fe17  

PREPARATION OF Tb_2Fe_(17) BY DIRECT ELECTROCHEMICAL REDUCTION OF Tb_4O_7-Fe_2O_3 PELLET IN MOLTEN CALCIUM CHLORIDE

作　　者：邱国红[1,2] 汪的华[1] 金先波[1] 陈政[1,3] 

机构地区：[1]武汉大学化学与分子科学学院,武汉430072 [2]华中农业大学资源与环境学院,武汉430070 [3]School of Chemical and Environmental Engineering,University of Nottingham,Nottingham NG7 2RD,UK

出　　处：《金属学报》2008年第7期859-862,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50374052和20573081资助~~

摘　　要：在CaCl_2熔盐中直接电化学还原固态Tb_4O_7与Fe_2O_3(Tb:Fe=2:17)的混合粉末,一步制得了金属间化合物Tb_2Fe_(17).结合混合氧化物烧结片在850℃的CaCl_2熔盐中3.1V电解不同时间段产物的成分分析探讨了还原机理,Fe_2O_3优先还原成金属Fe,随后Tb_4O_7粉末在Fe上还原逐渐生成Tb_2Fe_(17).采用不锈钢筛网电极循环伏安法证明了Tb_4O_7在Fe上的欠电位还原.Tb2Fe17 magnetic intermetallic compound was successfully prepared by direct electrochemical reduction of solid pellet of mixed Tb407 and Fe203 powders （Tb ： Fe=2 ： 17） in molten CaCl2 at 850 ℃. The reduction process was studied through the composition characterization of the products obtained at different electrolysis times. It was found that Fe2O3 was preferentially deoxidized to metallic Fe, and then Tb4O7 was reduced assistantly by forming TbFex and finally Tb2Fe17 was obtained with the under-potential reduction of Tb4O7 on iron. This was further confirmed by cyclic-voltammetry measurement of a novel Tb4O7 powder filling stainless steel sieve electrode.

关 键 词：稀土磁性材料 熔盐电解 直接电化学还原 金属间化合物 Tb2Fe17 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TF111.52[金属学及工艺—金属材料]