Preparation of compact Li-doped Y2Ti2O7 solid electrolyte

doi:10.1016/j.ssi.2011.10.021

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Title:	Preparation of compact Li-doped Y2Ti2O7 solid electrolyte
Authors:	Wen, L.C.;Hsieh, H.Y.;Lee, Y.H.;Chang, S.C.;Kao, H.-C.I.;Sheu, H.S.;Lin, I.N.;Chang, J.C.;Lee, M.C.;Lee, Y.S.
Contributors:	淡江大學化學學系
Keywords:	(Y2 − xLix)Ti2O7 − x;Pyrochlore;Titanate;Li2O;Oxygen ion conductor
Date:	2012-01-01
Issue Date:	2013-01-08 17:14:58 (UTC+8)
Publisher:	Amsterdam: Elsevier BV * North-Holland
Abstract:	Three series of solid electrolytes were prepared with the nominal compositions of (Y2−xLi3x)Ti2O7 (Y3LT), (Y2−xLix)Ti2O7−x(YLT)and Y2−xTi2O7−3x/2 (YT) with x = 0.040 − 0.11. Comparing the unit cell a-axis of the YLT with that of YT, the latter is shorter with the same amount of x. This indicates a successful substitution of the Li ion into the Y site of Y2Ti2O7. However, both Y3LT and YLT have exactly the same unit cell a-axis length with the same amount of x so that the solid solution formed probably has the same formula, (Y2−xLix)Ti2O7−x, in which only one Li ion is substituted into the Y site. Extra Li2O added in the Y3LT is probably acting as a self flux to lower the melting point of the mixture. As a result, materials become more compact and grains grow bigger. One compound of Y3LT with x = 0.060 has a total conductivity of 4.3(4) × 10− 4 S⋅cm− 1 at 700 °C. Adding Li2O as a flux and carefully controlling the heat treatment history, compact sample of Y3LT with a relative density higher than 90% was obtained at a temperature as low as 1150 °C. Its ionic conductivity is comparable to one Y2Ti2O7 prepared at 1600 °C with a conductivity reported as 2.30 × 10− 4 S⋅cm− 1.
Relation:	Solid State Ionics 206, pp.39–44
DOI:	10.1016/j.ssi.2011.10.021
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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