高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (1): 6.

• 研究论文 • 上一篇    下一篇

自掺杂锰基氧化物La1-xMnO3+δ的电化学制备

黄云辉, 王哲明, 朱涛, 陈省, 廖春生, 严纯华   

  1. 北京大学稀土材料化学及应用国家重点实验室, 北京大学-香港大学稀土材料和生物无机化学联合实验室, 北京 100871
  • 收稿日期:2000-02-02 出版日期:2001-01-24 发布日期:2001-01-24
  • 通讯作者: 严纯华(1961年出生),男,博士,教授,博士生导师,主要从事稀土功能材料及分离研究.
  • 基金资助:

    国家自然科学基金(批准号:29701001;29832010);“九七三”项目(批准号:G19980613)资助

Preparation of Self-doped La1-x MnO3+δ Polycrystalline by Electrochemical Deposition

HUANG Yun-Hui, WANG Zhe-Ming, ZHU Tao, CHEN Xing, LIAO Chun-Sheng, YAN Chun-Hua   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, PK U-H K U Joint Laboratoryin Rare Earth Materialsand Bioinorganic Chemistry, Peking University, Beijing 100871, China
  • Received:2000-02-02 Online:2001-01-24 Published:2001-01-24

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摘要： 利用阴极还原恒电位和恒电流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La3+和Mn2+的物质的量比、沉积电位以及电流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Mn4+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, 输运性质

Abstract: The perovskite-type self doped La1-x MnO 3+ δ was prepared by heat treatment of the gel precursor deposited on a Pt electrode in solutions containing both La 3+ and Mn 2+ ions using catholic reduction electrochemical method. The influence of molar ratio of La 3+ and Mn 2+ in solution, deposition potential and current density on product composition was investigated. Our results indicate that varying the ratio of La 3+ and Mn 2+ 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 Mn 4+ content and ion vacancies for the self-doped manganites.

Key words: Perovskite, Electrochemical preparation, Synthesis mechanism, Transport property

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