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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (12): 1955-1959. 上一篇    下一篇

研究论文

ZrO_2-8mol%Y_2O_3纳米晶的碱性水热法合成及其烧结体的电性能研究

陶为华;马桂林;周丽;陈蓉   

  1. 苏州大学化学化工学院;解放军理工大学
  • 发布日期:2003-12-15

Hydrothermal Synthesis of ZrO_2-8 mol% Y)2O_3 Nanocrystallites in Basic Media and Electrical Properties of Their Sinters

Tao Weihua;Ma Guilin;Zhou Li;Chen Rong   

  1. College of Chemistry and Chemical Engineering, Suzhou University
  • Published:2003-12-15

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以湿化学法制得Zr(OH)_4和Y（OH）_3的共沉淀为前驱体，在碱性介质中用水 热法合成了ZrO_2-8 mol% Y_2O_3立方相纳米晶。研究发现，不同水热反应温度、 时间及pH值均对立方相纳米晶晶粒大小有较显著影响。将ZrO_2-8 mol% Y_2O_3纳 米晶在较低温度（1400 ℃）下烧结制备了致密的固体电解质陶瓷样品，比通常高 温固相反应法采用的烧结温度（> 1550 ℃）降低了150 ℃以上。测定了陶瓷样品 600 - 1000 ℃下的氧浓差电池电动势及氧泵（氧的电化学透过）性能。结果表明 ，用本研究方法制得的烧结体在高于800 ℃时的氧离子迁移数为1，具有优良的氧 离子导电性能。

关键词: 氧化锆, 氧化钇, 纳米相材料, 固体电解质, 水热反应, 电解质陶瓷, 烧结, 导电性

Z1O2-8 mol% Y_2O_3 nanocrystallites with a cubic phase were hydrotheimally prepared in basic media, with Zr(01-1)4 and Y(OH)_3 co- precipitated from the solutions of ZrOCl_2·8H_2O and Y(NO_3)_3·6H_2O as precursor, It was discovered that the cubic-phased nanocrystallite size was obviously affected by pH value, temperature and time of hydrothermal reaction. The higher the pH value of the reaction medium and the reaction temperature, the larger the nanocrystallite size. Green compacts made from the nanopowders can be sintered to above 97 % of theoretical density at 1400 ℃, about 150 ℃ lower than that for traditional high temperature solid state reaction. The oxygen ion conduction properties of these sinters were investigated by means of oxygen concentration cell and oxygen pump (electrochemical oxygen permeation) at 600 -1000 ℃. The results show that these sinters are almost pure oxygen conductors in oxygen atmosphere above 800 ℃.

Key words: ZIRCONIUM OXIDE, YTTRIUM OXIDE, NANOPHASE MATERIALS, SOLID ELECTROLYTE, HYDRO-THERMAL REACTION, CERAMICS, CLINKERING, ELECTRICAL CONDUCTIVITY

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