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Title of Journal: J SolGel Sci Technol

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Abbravation: Journal of Sol-Gel Science and Technology

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Springer US

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DOI

10.1016/0015-0568(80)90019-6

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1573-4846

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Synthesis of garnet structured LiSubscript7+Emp

Authors: C Deviannapoorani L Dhivya S Ramakumar R Murugan
Publish Date: 2012/09/14
Volume: 64, Issue: 2, Pages: 510-514
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Abstract

Preparation of lithium garnet Li7La3Zr2O12 LLZ in cubic phase by solid state method requires high temperature sintering around 1200 °C for 36 h in Al2O3 crucible with intermittent grinding Synthesis of LLZ in cubic phase at lower temperatures by wet chemical methods was reported earlier however that decompose at high temperature around 850 °C In this work we report the systematic studies on synthesis of garnet structured electrolytes by modified sol–gel method by the simultaneous substitution of Li+ and Y3+ for Zr4+ according to the formulae Li7+x La3Y x Zr2x O12 x = 0 01 02 03 and 04 The present investigation revealed that the cubic garnet phase is obtained at much lower temperature for Li7La3Zr2O12 and the simultaneous increase of both Li+ and Y3+ in Li7+x La3Y x Zr2x O12 requires slightly higher sintering temperatures for the formation of cubic garnet phase SEM micrographs of the Li7+x La3Y x Zr2x O12 x = 0 01 02 03 and 04 annealed at minimum sintering temperature required for the formation of cubic garnet phase revealed the increase in grain size and relatively dense structure with increase of x in Li7+x La3Y x Zr2x O12The authors gratefully acknowledge the financial support of CSIR New Delhi India No03 1144/09/EMRII and Pondicherry University Puducherry India PU/PC/Startup Grant/201112/306 The authors are thankful to CIF Pondicherry University for extending the instrumentation facility

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