高等学校化学学报

高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (2): 217.

• 论文 • 上一篇    下一篇

Eu1-xTbxBa2Cu3O7-δ中Tb离子价态的研究

李莉萍, 魏诠, 王一峰, 刘宏建, 黄昌烈, 王春蕾, 李凡, 苏文辉   

  1. 吉林大学物理系, 长春, 130023
  • 收稿日期:1990-11-01 出版日期:1992-02-24 发布日期:1992-02-24
  • 通讯作者: 苏文辉
  • 基金资助:

    国家自然科学基金

Studies on the Valence State of Tb Ion in Eu1-xTbxBa2Cu3O7-δ

LI Li-ping, WEI Quan, WANG Yi-feng, LIU Hong-jian, HUANG Chang-lie, WANG Chun-lei, LI Fan, SU Wen-hui   

  1. Department of Physics, Jilin University, Changchun, 130023
  • Received:1990-11-01 Online:1992-02-24 Published:1992-02-24

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摘要： 研究了BaTbO3、Tb4O7、TbFeO3的Tb4dXPS谱,找到了表征Tb3+、Tb4+的特征峰,得出的高、低结合能峰强之比与Tb4+/Tb含量间的依赖关系,可用于确定Eu1-xTbxBa2Cu3O7-δ中“123”相的Tb离子混合价态,用常压高温烧结法,未能获得纯“123”单相,也不易获得纯利Tb3+价态样品.在Eu1-xTbxBa2Cu3O7-δ中的Tb以Tb3+、Tb4+混合价态存在;当x=0.3时,Tb4+/Tb=0.61.引入Tb4+后“123”主相Cu(2)-O(2)平面上的O2p空穴数降低,这是Tb4+破坏超导电性的一种可能原因。

关键词: Eu-Tb-Ba-Cu-O, X射线光电子能谱, Tb离子价态, Tb3+)含量, 超导电性

Abstract: In this paper, the Tb4d photoelectron spectra in compounds of BaTbO3, Tb4O7 and TbFeO3 were measured, and the characteristic levels of Tb3+ and Tb4+ were found to be 149.45 and 156.20 eVrespectivelyThe relationship between the intensity ratio (I) of the higher binding energy peak to the lower one and the content of Tb4+/Tb(z) is obtained for the first time, I= -0.98z2+2.15z(0≤z≤1), which can be used to determine the valence state of Tb ion in the "123" phase of Eu1-xTbxBa2Cu3O7-δBy normal sintering method at atmosphere and high temperature, the pure "123" phase Can not be obtained, and it is also difficult to form Eu1-xTbxBa2Cu3O7-δ samples containing pure Tb3+In the "123" phase of Eu1-xTbxBa2Cu3O7-δ, the Tb ions are in a mixing valence state of Tb3+ and Tb4+, and when x = 0.3, Tb4+/Tb=0.61 The O2p hole number in the Cu(2)-O(2) plane is decreased because of doping Tb4+, and this may be one of the reasons of destroying the superconductivity.

Key words: Eu-Tb-Ba-Cu-O, XPS, Tb ion valence state, Tb3+ content, Superconductivity

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