无机材料学报 ›› 2012, Vol. 27 ›› Issue (8): 887-890.DOI: 10.3724/SP.J.1077.2012.12130 CSTR: 32189.14.SP.J.1077.2012.12130

• 研究快报 • 上一篇    下一篇

RBaCo2O5+δ陶瓷的氧阻性能研究

宋红章1, 秦 臻2, 高 峰1, 贾建峰1, 杨德林1, 胡 行1   

  1. (1. 郑州大学 物理工程学院 材料物理教育部重点实验室, 郑州 450052; 2. 华北水利水电学院 数学与信息科学学院, 郑州 450011)
  • 收稿日期:2012-03-05 修回日期:2012-04-05 出版日期:2012-08-20 网络出版日期:2012-07-09
  • 基金资助:

    Natural Science Research Project of Education Committee of Henan Province (2011B430021)

Investigation on Oxygen Resistance Properties of RBaCo2O5+δ Ceramics

SONG Hong-Zhang1, QIN Zhen2, GAO Feng1, JIA Jian-Feng1, YANG De-Lin1, HU Xing1   

  1. (1. Key Laboratory of Material Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China; 2. College of Mathematics and Information Science, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China)
  • Received:2012-03-05 Revised:2012-04-05 Published:2012-08-20 Online:2012-07-09
  • Supported by:

    Natural Science Research Project of Education Committee of Henan Province (2011B430021)

摘要: 用固相反应法制备了RBaCo2O5+δ(R=Y、Dy、Gd、Pr、Nd、Sm和Eu)系列陶瓷. 用标准四探针法测量了它们从室温到600℃之间的电阻率变化. 在温度较低时, 它们的电阻率都随着温度的升高而减小, 显示为半导体特征. 当电阻率在某一温度达到最大值后, 电阻率开始随着温度升高而缓慢增加, 显示为半金属特征. 进一步研究了RBaCo2O5+δ系列陶瓷在高温恒温时的电阻率随着环境气氛的变化情况. 结果表明RBaCo2O5+δ陶瓷是一类潜在的氧阻传感器材料, 并且它们的响应速率从快到慢顺序是YBaCo2O5+δ > DyBaCo2O5+δ > GdBaCo2O5+δ > PrBaCo2O5+δ > NdBaCo2O5+δ > SmBaCo2O5+δ > EuBaCo2O5+δ. 以YBaCo2O5+δ陶瓷为例, 在700℃恒温时, 当从氧气氛切换到氮气氛时, 由于晶格中氧的脱附导致电阻率先是快速上升, 然后缓慢上升, 并在90 s内达到最大平衡值. 反之, 当从氮气氛切换为氧气氛时, 由于氧的吸附, 电阻率迅速降低, 约30 s内达到最小平衡值.

关键词: RBaCo2O5+δ陶瓷, 环境氧分压, 变阻器, 传感器

Abstract: RBaCo2O5+δ (R=Y, Dy, Gd, Pr, Nd, Sm, and Eu) ceramics were synthesized by the solid-state reaction method. Their resistivities depending on temperature were investigated by the standard four-probe method from room temperature to 600℃. At low temperature, all the resistivities decrease with the rising temperature, and exhibit semiconducting behavior. After the resistivities reach minimum values at certain temperatures, they increase slowly with temperature, and exhibit semimetal conducting behavior. Especially, the resistivity variations of RBaCo2O5+δ samples with the change of atmosphere at constant temperatures are studied. The results show that RBaCo2O5+δ could be potential oxygen resistance sensor materials, and that the responding rates of RBaCo2O5+δ are YBaCo2O5+δ > DyBaCo2O5+δ > GdBaCo2O5+δ > PrBaCo2O5+δ > NdBaCo2O5+δ > SmBaCo2O5+δ > EuBaCo2O5+δ. For YBaCo2O5+δ, the resistivity rises quickly due to the oxygen desorption when the atmosphere is switched from oxygen to nitrogen at 700℃, and reaches its maximum equilibrium value within 90 s. In addition, the resistivity drops drastically due to the oxygen adsorption when the nitrogen atmosphere is switched to oxygen, and reaches its minimum equilibrium value within 30 s.

Key words: RBaCo2O5+δ ceramics, surrounding oxygen pressure, varistors, sensors

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