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中文摘要：
采用溶胶-凝胶方法合成了系列新型氧化物Ce5．2RE0.8MoO15-δ（RE=Ce，Y，La，Sm，Gd，Dy，Ho，Er）．通过XRD，Paman和XPS等手段对氧化物的结构进行了表征，采用交流阻抗谱测试其导电性能．研究结果表明，RE^3＋的掺杂可增加氧离子的空位浓度，改善母体电导率，晶胞参数随RE^3＋半径的增大而增大．掺杂离子Dy^3＋的半径（0．0908nm）与母体基质离子Ce^4＋的半径（0．0920nm）相近，形成的掺杂氧化物晶格弹性应变最小，RE^3＋与氧空位间的缔合焓（△HA）最小，因而氧化物Ce5.2Dy0.8MoO15-δ具有相对较高的电导率（7．02×10^-3S／cm）和较低的激活能（1．056eV）．
英文摘要：
A series of solid state electrolytes,Ces. 2RE0. 8MoO15 -δ （RE =Y, La, Sin, Gd, Dy, Ho, Er）, were synthesized by sol-gel method. Their structures and electrical conductivities were characterized by X-ray Diffraction（ XRD）, Raman and X-ray Photoelectron Spectroscopy （XPS） and AC impedance spectroscopy, respectively. The results show that the concentrations of oxygen vacancy increased with increasing x and their conductivity were improved. And the cell parameters increase as the radius of RE^3＋ increases. Because the ionic radius of doped Dy^3＋ （0. 0908 nm） is closed to that of Ce^4＋ （0. 0920 nm）, their oxide has minimal cell elastic straining between RE^3 ＋ and oxygen vacancy, and the system has the least association enthalpy, thus the oxide Ce5.2 Dy0.8 MoO15-δ exhibits a higher conductivity （7.02 × 10^-3 S/cm） and lower activation energy （ 1. 056 eV） compared to the other doped compounds.
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