Effect of the Ca-doping on the electrical conductivity of ozide ion conductor Yb2Ti2O7
(0) The first results are presented on heterovalent substitution of alkaline-earth cations Ca2+for Yb3+in oxide ion conductor Yb2Ti2O7.(Yb1-xCax)2Ti2O7 (x=0.05,0.1) has been synthesized using mechanical activation of the oxides Yb2O3, CaO, TiO2 and subsequently sintering at 1400℃ in air, and their electrical conductivity has been measured from 300 to 950℃. (Yb0.9Ca0.1)2Ti2O7 synthesized at 1400℃ from a mechanically activated oxide mixture has the highest conductivity among the pyrochlores studied so far: 2×10-2 S/cm at 740℃, i.e., 0.2 S/cm at 1000℃. Neutron diffraction data indicate that the Ca2+in (Yb0.9Ca0.1)2Ti2O7 occupies the ytterbium site, leading to the formation of oxygen vacancies in the O2 (48f) site and the presence of oxygens in the O3 (8b) site, normally vacant in ordered pyrochlores. No evidence of Ca substitution on the Ti site has been found.
ozide ion conductor pyrochlore impedance spectroscopy doping neutron diffraction
A.V.Shlyakhtina Petra Fedtke Andreas Busch I.V.Kolbanev Torsten Barfels Marion Wienecke A.E.Sokolov V.A.Ulianov V.A.Trounov
Semenov Institute of Chemical Physics Russian Academy of Sciences, ul.Kosygina 4, Moscow, 119991 Rus Hochschule Wismar Institute of Surface and Thin Film Technology, Philipp-Muller-Strasse, 23952 Wisma Konstantinov Institute of Nuclear Physics, Russian Academy of Sciences, Leningrad.Oblast., Gatchina,
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
1004-1008
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）