Cation distribution and piezoelectric properties of aluminum substituted La3Ta0.5Ga5.5O14 single crystals

被引：19

作者：

Takeda, Hiroaki ^{[1
]}

Yamaura, Jun-ichi ^{[2
]}

Hoshina, Takuya ^{[1
]}

Tsurumi, Takaaki ^{[1
]}

机构：

[1] Tokyo Inst Technol, Grad Sch Sci & Technol, Meguro Ku, Tokyo 1528552, Japan

[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2010年 / 118卷 / 1380期

关键词：

Oxides; Crystal growth; Crystal structure; Cation distribution; Piezoelectricity; High temperature; CZOCHRALSKI GROWTH; LANGASITE;

D O I：

10.2109/jcersj2.118.706

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the structure and electric properties of La3Ta0.5Ga5.5-xAlxO14 (LTGAx, x = 0.0 (LTG), 0.3 and 0.5) single crystals, with a Ca3Ga2Ge4O14-type structure, suitable for high temperature piezoelectric application. A single-crystal X-ray structure analysis reveals that Al atoms are distributed in all cation sites except for the decahedral site occupied by La, which favors instead the octahedral site. The piezoelectric moduli d(11) kept a constant, whereas vertical bar d(14)vertical bar increased 14% with the increasing Al content, x, up to 0.5. The LTGA0.5 crystals showed a low temperature dependence (2% deviation from room temperature to 400 degrees C) of d(11) and a higher electric resistivity rho than those of the LTG crystals. The Al substitution is effective for improving the electrical properties of the LTG. (C) 2010 The Ceramic Society of Japan All rights reserved.

引用

页码：706 / 710

页数：5

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