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直接熔盐电化学还原固态Tb₄O₇-Fe₂O₃制备Tb₂Fe₁₇

PREPARATION OF Tb₂Fe₁₇ BY DIRECT ELECTROCHEMICAL REDUCTION OF Tb₄O₇-Fe₂O₃ PELLET IN MOLTEN CALCIUM CHLORIDE

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【Author】 QIU Guohong~(1,2)) WANG Dihua~(1)) JIN Xianbo~(1)) George Zheng CHEN~(1,3)) 1) College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072 2) College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070 3) School of Chemical and Environmental Engineering,University of Nottingham,Nottingham NG7 2RD,UK

【机构】武汉大学化学与分子科学学院；

【摘要】在CaCl₂熔盐中直接电化学还原固态Tb₄O₇与Fe₂O₃（Tb:Fe=2:17）的混合粉末,一步制得了金属间化合物Tb₂Fe₁₇.结合混合氧化物烧结片在850℃的CaCl₂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,Fe₂O₃优先还原成金属Fe,随后Tb₄O₇粉末在Fe上还原逐渐生成Tb₂Fe₁₇.采用不锈钢筛网电极循环伏安法证明了Tb₄O₇在Fe上的欠电位还原.更多还原

【Abstract】 Tb₂Fe₁₇ magnetic intermetallic compound was successfully prepared by direct elec- trochemical reduction of solid pellet of mixed Tb₄O₇ and Fe₂O₃ 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 deoxi- dized to metallic Fe,and then Tb₄O₇ was reduced assistantly by forming TbFe_x 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.更多还原