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Synthesis of New Lithium Titanium Niobate Solid Solution and its Dielectric Properties.

新型钛铌酸锂固溶体的合成及其介电性能。

基本信息

批准号：
62550551
负责人：
SHIMADA Shiro
金额：
$ 1.15万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550551/
关键词：
new lithium titanium niobate solid solution new lithium titanium tantalate solid solution ferroelectric oxide 単結晶のフラックス育成誘電特性

项目摘要

New lithium titanium niobate solid solutions were found to form on the tie lines of LiNbO_3-Li<@21.33<@D2Ti<@D21.66@>D2O<@D24@>D2 and LiNbO<@D23@>D2-Li<@D22@>D2TiO<@D23@>D2 and at a part of the regions surrounded by the two lines. Single phase of this new solid solution was obtained at the compositions on the former tie line containing 0.09 - 0.38 mole % of Li<@D21.33@>D2Ti<@D21.66@>D2O<@D24@>D2. Its single crystals with the composition of Li:Ti:Nb=19:10:12 were successfully grown to have a hexagonal habit and the crystal system and lattice constants of this crystal were determined by Precession camera. Sintered bodies having the relative density greater than 90 % were fabricated with the compositions of the line of LiNbO<@D23@>D2-Li<@D21.33@>D2Ti<@D21.66@>D2O<@D24@>D2. The dependency of the dielectric constans of these bodies on themperature at frequency of 1 KHz showed that these new solid solution are ferroelectric oxide at the Curie temperature around 750 - 970 ゜C a which the dielectric constans are as high as 10<@D14@>D1. The Curie temperature decreased with an increase of the amount of Li<@D21.33@>D2Ti<@D21.66@>D2O<@D24@>D2. New lithium titanium tanalate solid solutions were also found to form, similarly to the case of the niobate. The crystal growth and the measurements of the dielectric constant of these tantalum solid solutions were also carried out.

在LiNbO_3-Li<@D21.66@> D2 Ti <@D24@>D2和LiNbO<@D23@>D2-Li<@D22@> D2 TiO <@D23 @>D2的连接线上以及被这两条线包围的部分区域内，发现有新的钛酸锂固溶体形成。在含有0.09 - 0.38摩尔%的Li<@D21.33@> D2 Ti <@D21.66@> D2 O <@D24@>D2的前一种连接线上的组成下，获得这种新固溶体的单相。成功地生长出具有六方晶系的Li：Ti：Nb=19：10：12的单晶，并用旋进相机测定了该晶体的晶系和晶格常数。用LiNbO<@D23@>D2-Li<@D21.33@> D2 Ti <@D21.66@> D2 O <@D24@>D2系列的组成制备了相对密度大于90%的烧结体。在频率为1 KHz时，介电常数与温度的关系表明，这些新固溶体在居里温度为750 - 970 ℃时为铁电氧化物，介电常数高达10<@D14@> D ~ 1。居里温度随Li<@D21.33@> D2 Ti <@D21.66@> D2 O <@D24@>D2含量的增加而降低。还发现形成新的钽酸锂钛固溶体，类似于钽酸盐的情况。对钽固溶体进行了晶体生长和介电常数的测量。