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首页> 外文会议>XXVII Congress of the Mexican Society of Electrochemistry/5th Meeting of the ECS Mexican Section >Electrical Properties of (CeO_2)_(0.9)(MO)_(0.1) (M=Ca or Mg) Solid Electrolyte System
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Electrical Properties of (CeO_2)_(0.9)(MO)_(0.1) (M=Ca or Mg) Solid Electrolyte System

机译：（CeO_2）_（0.9）（MO）_（0.1）（M = Ca或Mg）固体电解质体系的电性能

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摘要

Electrical conductivity studies of alkaline earth oxides doped ceria Ce_(0.9)M_(0.1)O_(2-δ), (where M=Ca and Mg) is reported in this work. The samples were prepared at room temperature by mechanical milling. X-ray diffraction patterns confirm the cubic fluorite structure. Scanning electron micrographs of MgO doped sample shows the presence of the segregation of Mg~(2+) which results a negative effect on the electric properties of the MgO doped sample. Frequency dependence of ac conductivity (σ_(ac)) of these oxide ion conductors showed a remarkably different behavior from that of the cation ones. As temperature increases above 350℃, ac conductivity σ_(ac) in the low frequency range was strongly influenced by space charge polarization at grain boundary and the high frequency plateau agreed with the bulk conductivity of the system. Bulk and grain boundary conductivity studies show that CaO doped ceria exhibit better electrical properties compared to MgO doped sample.
机译：这项工作报告了碱土金属氧化物掺杂二氧化铈Ce_（0.9）M_（0.1）O_（2-δ）（其中M = Ca和Mg）的电导率研究。样品在室温下通过机械研磨制备。 X射线衍射图证实了立方萤石结构。掺杂MgO的样品的扫描电子显微镜照片显示，存在Mg〜（2+）偏析，这对掺杂MgO的样品的电性能产生负面影响。这些氧化物离子导体的交流电导率（σ_（ac））的频率依赖性显示出与阳离子导体明显不同的行为。当温度升高到350℃以上时，低频范围内的交流电导率σ_（ac）受到晶界空间电荷极化的强烈影响，高频平稳区与系统的整体电导率相吻合。体和晶界电导率研究表明，与掺杂MgO的样品相比，掺杂CaO的二氧化铈具有更好的电性能。

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