KJ Ceramics 31

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Detailed Program

Paper Number : EL-I01

Time Frame : 16:30~16:55

Presentation Date : Thurseday, 27, November

Session Name : Electronic Ceramics

Session Chair 1# : Chae Il Cheon

Session Chair 2# : Hitoshi Ohsato

Effect of Processing Method on Low-temperature Crystallization of Ion-conductive Cubic Li7La3Zr2O12 Nanoparticles

Hisao SUZUKI

Shizuoka University

In this study, ion-conductive cubic Li7La3Zr2O12 nanoparticles with garnet structure were successfully prepared from molecular-designed precursor at low temperature of 700 ºC. The crystalline phases and the crystallization temperatures for the powders derived from different precursors which were prepared by the solid-liquid reaction method, In-situ precipitation method and sol-gel method, respectively. In addition, we designed the molecular structure of the alkoxide-derived precursors in the sol-gel method. As a result, homogeneity of the precursors was totally different depending on the processing method and the conditions of each preparation method. In the solid-liquid reaction method, zirconia powders were reacted with the liquid phase of ethanol with Li and La acetate. In this case, we need Al addition to obtain cubic Li7La3Zr2O12 nanoparticles at 800 ºC. On the other hand, homogeneity of the precursor should be high enough to obtain cubic Li7La3Zr2O12 nanoparticles without addition of Al at 800 ºC because we prepared very fine zirconia sol by the careful hydrolysis of the zirconium-oxychloride. Compared with the above two method, homogeneous precursor at molecular-level could be prepared by the sol-gel method if the partial hydrolysis condition of the zirconium alkoxide were optimized for the low-temperature crystallization. As a result, we concluded that the sol-gel method is the powerful tool to prepare homogeneous precursor for the low-temperature crystallization, in which molecular structure was properly designed.

Acknowledgements :

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