Abstract
The effect of substitution and hydrostatic pressure on lithium ion conductivity in polycrystalline Ln12Li12TiO3 (Ln = La, Pr, Nd and Sm) were investigated and the ion conduction mechanism in perovskite-type oxides was elucidated. The lithium ion conductivity was found to decrease, accompanied by an increase of the activation energy and volume for the ion conduction when the ionic radius of Ln ions was decreased or high pressure was applied for these compounds. A simple energetic calculation using a two-body central force has confirmed the importance of the bottle-neck size for ion conduction, which effectively determines the value of the repulsion potential between oxygen and lithium ions. © 1997 Elsevier Science Ltd
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