Crystal Growth of Ca3Nb(Ga1-xAlx)3Si2O14 Piezoelectric Single Crystals with Various Al Concentrations

被引：20
|
作者：
Yokota, Yuui [1 ]
Kudo, Tetsuo [2 ]
Ohashi, Yuji [2 ]
Medvedev, Andrey [2 ]
Kurosawa, Shunsuke [1 ,2 ]
Kamada, Kei [1 ,3 ]
Yoshikawa, Akira [1 ,2 ,3 ]
机构：
[1] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
[3] C&A Corp, Aoba Ku, Sendai, Miyagi 9808579, Japan
来源：
MATERIALS | 2015年 / 8卷 / 09期
基金：
日本科学技术振兴机构;
关键词：
langasite; piezoelectric crystal; single crystal; micro-pulling-down method; SUBSTITUTION; ALUMINUM;
D O I：
10.3390/ma8095264
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ca3Nb(Ga1-xAlx)(3)Si2O14 (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (mu-PD) method and their crystal structures, chemical compositions, crystallinities were investigated. CNGAS crystals with x = 0.2, 0.4 and 0.6 indicated a single phase of langasite-type structure without any secondary phases. In contrast, the crystals with x = 0.8 and 1 included some secondary phases in addition to the langasite-type phase. Lattice parameters, a- and c-axes lengths, of the langasite-type phase systematically decreased with an increase of Al concentration. The results of chemical composition analysis revealed that the actual Al concentrations in as-grown crystals were almost consistent with the nominal compositions. In addition, there was no large segregation of each cation along the growth direction.
引用
收藏
页码：5597 / 5605
页数：9
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