Electrical properties of the (Gd2−xLix)Ti2O7−x co-existence with the LiO0.5 self-flux

doi:10.2109/jcersj2.123.367

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Title:	Electrical properties of the (Gd2−xLix)Ti2O7−x co-existence with the LiO0.5 self-flux
Authors:	Wen, Liang-Chang;Tsai, Yun-I;Hsu, Tzu-Huan;Wang, Ching-Hsien;Wu, Mong-Shin;Kao, Huey-Chuen I.;Lee, Maw-Chwain
Keywords:	Pyrochlore;Titanate;Flux;Electrical property;Oxide-ion conductor
Date:	2015-05-01
Issue Date:	2016-01-06 11:01:21 (UTC+8)
Abstract:	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.
Relation:	Journal of the ceramic society of Japan 123(5), pp.367-373
DOI:	10.2109/jcersj2.123.367
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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