Textured lithium lanthanum titanate polycrystals prepared by a reactive-templated grain growth method

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• 作者：Kazumasa Takatori^a ; Keisuke Saura^b ; Aslihan Orum^c ; Hiroaki Kadoura^a ; Toshihiko Tani^a ; ^c ; ^{toshit@mosk.tytlabs.co.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Textured ceramic ; Topochemical conversion ; Reactive template ; Electrolyte ; Layered perovskite
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：36
• 期：3
• 页码：551-558
• 全文大小：2663 K

文摘

Textured polycrystals of lithium lanthanum titanate (La_{(2/3) − x}Li_3xTiO₃, 3x = 0.16 and 0.33) were topochemically designed and fabricated by the heat treatment of stacked tape-cast sheets including aligned elongated La₂Ti₂O₇ platelets as reactive templates. The crystallographic orientation relationship between the reactive template and the resultant sintered bodies was examined by X-ray diffraction analysis. A small amount of the plate-like template effectively controlled the crystallographic orientation of the sintered bodies and the Lotgering factor for the pseudocubic {1 1 0} with a 3x = 0.16 composition reached as high as 0.65 for the polished surface parallel to the original sheet. A secondary preferred orientation of the pseudocubic {1 0 0} was also detected in the polycrystals with 3x = 0.16 for sections perpendicular to the sheet forming direction as a result of the elongated shape of the template. The formation of biaxially oriented polycrystals can be explained by the inheritance of octahedral TiO₆ blocks from the layered to regular perovskites.