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,Ram an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,RE3+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RE3+半径的增大而增大.掺杂离子Dy3+的半径(0.0908 nm)与母体基质离子Ce4+的半径(0.0920 nm)相近,形成的掺杂氧化物晶格弹性应变最小,RE3+与氧空位间的缔合焓(ΔHA)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(1.056 eV).
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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期220-223,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20271049
20331030)资助
