摘要
以湿化学法制得Zr(OH)4和Dy(OH)3的共沉淀为前驱体,在碱性介质(pH=9.95～13.28)中用水热法合成了ZrO2-8mol%Dy2O3立方相纳米晶.研究发现,纳米晶粒径随着反应介质pH值的增大而增大.将该纳米晶在较低温度(1 400℃)下烧结制得了致密的陶瓷样品,比通常高温固相反应法采用的烧结温度(＞1550℃)降低了150℃以上.本研究还测定了陶瓷样品600℃～1 000℃下的氧浓差电池电动势及氧泵(氧的电化学透过装置)性能.结果表明,陶瓷样品在高于900℃时的氧离子迁移数为1,具有优良的氧离子导电性能.
ZrO2-8mol%Dy2O3 nanocrystallites with a cubic phase were hydrothermally prepared in basic media by co-precipitate, precursor, Zr（OH）4 and Dy（OH）3 from the solutions of ZrOCl2·8H2O and Dy2O3 in concentrated hydrochloric acid. It is discovered that the cubic nanocrystalline size is obviously affected by pH value. The higher the pH value of reaction medium, the larger the nanocrystalline size. Compacts made with the nanocrystallites prepared hydrothermally can be sintered up to 97 % of theoretical density at 1 400℃, which was 150℃ lower than that used by traditional high temperature solid state reaction. The oxide - ionic conductive 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 the conductive property in these sinters is almost pure oxide-ionic in oxygen atmosphere above 900℃.
出处
《苏州大学学报（自然科学版）》
CAS
2005年第4期62-66,85,共6页
Journal of Soochow University(Natural Science Edition)
基金
国家自然科学基金资助项目(20171034)
