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自掺杂锰基氧化物La1-xMnO3+δ的电化学制备
引用本文:黄云辉,王哲明,朱涛,陈省,廖春生,严纯华.自掺杂锰基氧化物La1-xMnO3+δ的电化学制备[J].高等学校化学学报,2001,22(1):6-9.
作者姓名:黄云辉  王哲明  朱涛  陈省  廖春生  严纯华
作者单位:北京大学-香港大学稀土材料和生物无机化学联合实验室,
基金项目:国家自然科学基金,国家重点基础研究发展计划(973计划),29701001,29832010,G19980613,,
摘    要:利用阴极还原恒电位和恒电化学沉积法制备了自掺杂钙钛矿结构的锰基氧化物La1-xMnO3 δ,研究了电解质溶液中La^3 和Mn^2 的物质的量比、沉积电位以及电密度对产物组成的影响,并对电沉积机理和晶格缺陷进行了探讨,结果表明,晶格中的离子空位和Mn^4 的含量是影响体系输运性质的关键。

关 键 词:锰基氧化物  电化学制备  合成机理  阴极还原电化学沉积  稀土  自掺杂
文章编号:0251-0790(2001)01-0006-04
修稿时间:2000年2月2日

Preparation of Self-doped La1-xMnO3+δ Polycrystalline by Electrochemical Deposition
HUANG Yun-Hui,WANG Zhe-Ming,ZHU Tao,CHEN Xing,LIAO Chun-Sheng,YAN Chun-Hua.Preparation of Self-doped La1-xMnO3+δ Polycrystalline by Electrochemical Deposition[J].Chemical Research In Chinese Universities,2001,22(1):6-9.
Authors:HUANG Yun-Hui  WANG Zhe-Ming  ZHU Tao  CHEN Xing  LIAO Chun-Sheng  YAN Chun-Hua
Abstract:The perovskite-type self-doped La1-x MnO3+δ was prepared by heat treatment of the gel precursor deposited on a Pt electrode in solutions containing both La3+ and Mn2+ ions using catholic reduction electrochemical method.The influence of molar ratio of La3+ and Mn2+ in solution,deposition potential and current density on product composition was investigated.Our results indicate that varying the ratio of La3+ and Mn2+ in solution,deposition potential or current density can conveniently control the product composition,lattice deficiencies and hence the self-doping level x.In addition,the transport properties are mainly influenced by Mn4+ content and ion vacancies for the self-doped manganites.
Keywords:Perovskite  Electrochemical preparation  Synthesis mechanism  Transport property
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