Synthesis, characterization, and electrical conduction of 10 mol% Dy2O3-doped CeO2 ceramics
Synthesis, characterization, and electrical conduction of 10 mol% Dy2O3-doped CeO2 ceramics
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DOI：
10.1016/j.jeurceramsoc.2004.01.020
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发表时间：
2005-03
影响因子：
5.7
通讯作者：
Yarong Wang;T. Mori;Ji-guang Li;J. Drennan
中科院分区：
文献类型：
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作者：
Yarong Wang;T. Mori;Ji-guang Li;J. Drennan
采用碳酸盐共沉淀法，以硝酸盐为起始盐，碳酸铵为沉淀剂，以碳酸盐为前驱体，热分解得到活性粉末，在950-1550°C下无压烧结，制备了平均晶粒尺寸为1.02 ~ 1.5μm的10mol%Dy2O3掺杂CeO 2（20 DDC）陶瓷。用直流三点阻抗法测得陶瓷的电导率随平均晶粒尺寸呈V型曲线变化。最小晶粒尺寸为0.12μm的样品在700°C的测量温度下表现出高达100 - 1.74S/cm的高电导率，这与两种主要电解质材料10mol%Sm2O3或Gd 2 O3掺杂的CeO 2的导电水平大致相同。
Well-densified 10mol% Dy2O3-doped CeO2(20DDC) ceramics with average grain sizes of ∼0.12–1.5μm were fabricated by pressureless sintering at 950–1550°C using a reactive powder thermally decomposed from a carbonate precursor, which was synthesized via a carbonate coprecipitation method employing nitrates as the starting salts and ammonium carbonate as the precipitant. Electrical conductivity of the ceramics, measured by the dc three-point impedance method, shows a V-shape curve against the average grain size. The sample with the smallest grain size of 0.12μm exhibits a high conductivity of ∼10−1.74S/cm at the measurement temperature of 700°C, which is about the same conduction level of the micro-grained 10mol% Sm2O3- or Gd2O3-doped CeO2, two leading electrolyte materials.