Czochralski growth of 2 in. Ca3Ta(Ga,Al)3Si2O14 single crystals for piezoelectric applications

被引：12

作者：

Yoshikawa, Akira ^{[1
,2
,3
]}

Shoji, Yasuhiro ^{[1
,3
]}

Ohashi, Yuji ^{[1
]}

Yokota, Yuui ^{[2
]}

Chani, Valery I. ^{[1
]}

Kitahara, Masanori ^{[1
,3
]}

Kudo, Tetsuo ^{[1
]}

Kamada, Kei ^{[2
,3
]}

Kurosawa, Shunsuke ^{[1
,2
]}

Medvedev, Andrey ^{[1
]}

Kochurikhin, Vladimir ^{[3
,4
]}

机构：

[1] Tohoku Univ, Inst Mat Res IMR, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi, Japan

[3] C&A Corp, Aoba Ku, 6-6-40 Aramaki Aza Aoba, Sendai, Miyagi 9808577, Japan

[4] Inst Gen Phys, Vavilov St 38, Moscow 119991, Russia

来源：

JOURNAL OF CRYSTAL GROWTH | 2016年 / 452卷

关键词：

Solid solutions; Czochralski method; Growth from melt; Piezoelectric materials; ORDERED LANGASITE STRUCTURE; STARTING MELT COMPOSITION; LA3GA5SIO14; GARNET;

D O I：

10.1016/j.jcrysgro.2015.12.031

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Growth of 2-in. diameter Al-substituted Ca3TaGa3Si2O14 crystals by Czochralski method is reported. The crystals were grown from the melt of Ca3TaGa1.5Al1.5Si2O14 composition and had langasite structure. No inclusions of secondary phases were detected in these crystals. The Ca3Ta(Ga,Al)(3)Si2O14 mixed crystals produced using non-substituted Ca3TaGa3Si2O14 seeds were defective. They had cracks and/or polycrystalline structure. However, those grown on the seed of approximately Ca3TaGa1.5Al1.5Si2O14 composition were defect-free. Phase diagram of the Ca3TaGa3Si2O14-Ca3TaAl3Si2O14 pseudo-binary system and segregation phenomenon are discussed in some details. Homogeneity of the crystals was evaluated by measuring 2D-mapping of leaky surface acoustic wave (LSAW) velocities for Y-cut Ca3TaGa1.5Al1.5Si2O14 substrate. Although some inhomogeneities were observed due to slight variations in chemical composition, the crystal had acceptable homogeneity for applications in acoustic wave devices exhibiting the LSAW velocity variation within +/- 0.048%. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：135 / 140

页数：6

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