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The microscopic features of (Li0.5La0.5)TiO3 |
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| Authors: | Hoon-Taek Chung Deock-SooCheong |
| Institution: | a Department of Ceramic Engineering Dongshin Univeristy, Naju, Chonnam 520-714, Republic of Korea b Division of Ceramics, Korea Institute of Science and Technology, Seoul 130-650, Republic of Korea |
| Abstract: | In ionic conducting materials, the crystal structure is closely related to the ionic conductivity. In this research we studied the microscopic features of Li0.5La0.5TiO3 which exhibited a lithium ionic conductivity as high as 1×10−3 Scm−1 at room temperature by XRD, TEM and SIMS. It was found that the superstructure was caused by the ordering of La+3 and vacancy, producing the 2ap×2ap×2ap unit cell. This ordering was found to be regular in microscopic region, but became irregular in macroscopic region. Li+ showed a random distribution which meet the needs for the fast ionic conduction. The second phase was found to be Li2TiO3 which existed in the grain boundary junctions. |
| Keywords: | Perovskite structure Lithium ionic conductivity Superstructure Ordering |
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