化学学报 ›› 2005, Vol. 63 ›› Issue (6): 491-496. 上一篇    下一篇

研究论文

(ZrO2)0.86(Sm2O3)0.14纳米粉体的水热法合成及其烧结体的电性能

刘荣梅1,马桂林*,1,周丽1,陈蓉2   

  1. (1苏州大学化学化工学院 苏州 215006)
    (2解放军理工大学理学院 南京 211101)
  • 收稿日期:2004-06-15 修回日期:2004-11-25 出版日期:2005-03-28 发布日期:2010-12-10
  • 通讯作者: 马桂林

Hydrothermal Synthesis of (ZrO2)0.86(Sm2O3)0.14 Nano-powders and Electrical Properties of Its Sinter

LIU Rong-Mei1, MA Gui-Lin*,1, ZHOU Li1, CHEN Rong2   

  1. (1 College of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215006)
    (2 Institute of Sciences, The Chinese People's Liberation Army University of Science and Technology, Nanjing 211101)
  • Received:2004-06-15 Revised:2004-11-25 Online:2005-03-28 Published:2010-12-10
  • Contact: MA Gui-Lin

以湿化学法制得Zr(OH)4和Sm(OH)3的共沉淀为前驱体, 在碱性介质中用水热法合成了(ZrO2)0.86(Sm2O3)0.14及(ZrO2)0.88(Sm2O3)0.12纳米粉体. 将纳米粉体在较低温度(1450 ℃)下烧结制得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(>1600 ℃)降低了150 ℃以上. XRD测定结果表明, (ZrO2)0.86(Sm2O3)0.14纳米粉体及其烧结体均为立方相, 但(ZrO2)0.88(Sm2O3)0.12纳米粉体为立方相, 它的烧结体为立方相和单斜相的混合相. 用交流阻抗谱法、氧浓差电池法及氧泵(氧的电化学透过)法研究了(ZrO2)0.86(Sm2O3)0.14陶瓷样品在600~1000 ℃下的离子导电特性. 结果表明, 该陶瓷样品在600~1000 ℃下氧离子迁移数为1, 氧离子电导率的最大值为3.2×10-2 S•cm-1, 是一个优良的氧离子导体; 它的氧泵性能明显地优于YSZ.

关键词: (ZrO2)0.86(Sm2O3)0.14, 纳米晶, 固体电解质, 水热合成, 固体氧化物燃料电池

(ZrO2)0.86(Sm2O3)0.14 and (ZrO2)0.88(Sm2O3)0.12 nano-powders were hydrothermally prepared in basic media by co-precipitation of Zr(OH)4 and Sm(OH)3. Green compacts made with the nano-powders prepared hydrothermally could be sintered to above 98% of theoretical density at 1450 ℃, which was 150 ℃ lower than that (>1600 ℃) used for traditional high-temperature solid state reaction. The results of XRD indicated that both the nano-powders and sinter of (ZrO2)0.86(Sm2O3)0.14 are in a cubic phase, and (ZrO2)0.88(Sm2O3)0.12 nano-powder is in a cubic phase, but its sinter is in a mixed phase of cubic phase and monoclinic phase. The oxygen ion conduction properties of (ZrO2)0.86(Sm2O3)0.14 ceramic were investigated by means of complex impedance, oxygen concentration cell and oxygen pump (electrochemical oxygen permeation) at 600~1000 ℃. The maximal conductivity of the ceramic is 3.2×10-2 S•cm-1 in O2 at 1000 ℃. The conduction in the ceramic is purely oxide-ionic with oxygen ion transference number of 1 over the whole temperature range of 600~1000 ℃. This ceramic is obviously superior to YSZ ceramic in oxygen pump performance.

Key words: (ZrO2)0.86(Sm2O3)0.14, nano-powder, solid-electrolyte, hydrothermal synthesis, SOFC