Electrical properties of the (Gd2−xLix)Ti2O7−x co-existence with the LiO0.5 self-flux
學年 103
學期 2
出版(發表)日期 2015-05-01
作品名稱 Electrical properties of the (Gd2−xLix)Ti2O7−x co-existence with the LiO0.5 self-flux
著者 Wen, Liang-Chang; Tsai, Yun-I; Hsu, Tzu-Huan; Wang, Ching-Hsien; Wu, Mong-Shin; Kao, Huey-Chuen I.; Lee, Maw-Chwain
著錄名稱、卷期、頁數 Journal of the ceramic society of Japan 123(5), pp.367-373
摘要 A series of (Gd2-xLix)Ti2O71x with x = 0.050-0.150, abbreviated as GLT-2L were prepared by the addition of 2x mole of LiO0.5 self-flux in the parent compound. Preparation temperatures were between 1450 and 1500°C depending on the amount of the self-flux addition. Relative densities of all GLT-2L samples were larger than 97.9(3)%. However, the parent compound, Gd2Ti2O7 has no LiO0.5 co-existence, it has a relative density of 92.8(4)% only, although it was prepared at a higher temperature, 1650°C. Among the GLT-2L samples, the one with x = 0.110 has the highest total electrical conductivity, 6.17(6) x 10-5 S•cm-1 at 700°C and the lowest activation energy, 0.95(3) eV. Doping Li+ ions into the Gd-site of Gd2Ti2O7, preparation temperature was lowered and samples become denser. Meanwhile, vacancies were created and electrical conductivity was increased. At 500°C, average ionic transference numbers (ti) found for all samples are fully ionic. Increasing temperature, ti decreases slightly due to the increase of the fractional electronic conductivity of the (Gd2-xLix)Ti2O7-x, which is a mixed conductor at high temperature. Ti atoms are in the mixed valence states.
關鍵字 Pyrochlore;Titanate;Flux;Electrical property;Oxide-ion conductor
語言 en_US
期刊性質 國外
收錄於 SCI
產學合作 國內
通訊作者 Liang-Chang Wen
國別 JPN
出版型式 ,電子版

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/104531 )