Synthesis and electrophysical properties of (1-z)Ce0.8Gd0.2O2-δ+zTiO2 (z=0-0.06) solid-state solutions
In the present work the electrical properties of 1-xCe0.8Gd0.2O2-δ+xTiO2 (x=0-0.06) synthesized by the standard ceramic technology were investigated, in a wide range of oxygen partial pressures (0.21-10-20 atm at 900℃) and temperatures (600-900℃), both in air and H2+3%H2O atmosphere. It was found, that only the introduction of above 1 mol% TiO2 decreases the sintering temperature of Ce0.8Gd0.2O2-δ. The values of total electrical conductivity do not change significantly with the content of the sintering aid up to 3 mol%, while the activation energy of total conductivity in air decreases considerably with the introduction of TiO2 into Ce0.8Gd0.2O2-δ from 87 to 67 kJ/mol; however, it is independent of x up to 0.03. The dependence of the total conductivity on the oxygen partial pressure is characterized by three regions. In the intermediate region (10-10-10-14) the conductivity behavior is described according to the oxygen vacancy model. The n-type conductivity region curve of Ce0.8Gd0.2O2-δ is fitted to a -1/5 slope. The increase of TiO2 content leads to the slope increase at -1/6, -1/8 and -1/9 for 1, 2 and 3 mol% TiO2, respectively, due to the trapping of electrons by Ti(4+). 1 mol% doping increases the electrolytic region of Ce0.8Gd0.2O2-δfrom 10-10 to 10-13 atm. Finally, the optimal content of TiO2 from the viewpoint of sintering and electrical properties was found to be 2 mol%.
Elecrophysical properties of CGO Doped CeO2-materials TiO2 additives
E.Yu.Pikalova V.I.Maragou A.K.Demin A.A.Murashkina RE.Tsiakaras
Institute of High Temperature Electrochemistry, 22 S.Kovalevskoy, 620219 Yekaterinburg, Russia School of Engineering, Dept.of Mechanical Engineering, University of Thessaly, Pedion Areas, 383 34
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1557-1561
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）