Relationship between crystal structure and acoustic physical properties of Ca3B(Ga,Al)3Si2O14 [B = Nb, Ta] piezoelectric single crystals

被引：1
作者：
Yokota, Yuui [1 ,2 ]
Ohashi, Yuji [2 ]
Horiai, Takahiko [2 ]
Yoshikawa, Akira [1 ,2 ]
机构：
[1] Tohoku Univ, Inst Mat Res, 2-1-1 Katahira,Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, 6-6-10 Aoba Ku, Sendai, Miyagi 9808579, Japan
来源：
MATERIALS TODAY COMMUNICATIONS | 2023年 / 37卷
基金：
日本科学技术振兴机构; 日本学术振兴会;
关键词：
Langasite-type; Single crystal; Piezoelectric material; Crystal structure; Acoustic physical property; LANGASITE CRYSTAL; GROWTH; SUBSTITUTION; LA3GA5SIO14;
D O I：
10.1016/j.mtcomm.2023.107506
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crystal structures of Ca3Nb(Ga,Al)3Si2O14 (CNGAS) and Ca3Ta(Ga,Al)3Si2O14 (CTGAS) single crystals are investigated in this study to reveal the relationship between their crystal structures and acoustic physical properties. The positional parameters of each element for the CNGAS and CTGAS single crystals are determined with high accuracy, whereas the bond lengths and bond angles are calculated using the positional parameters. Analysis results of the crystal structures suggest that the increase of bond angles, O2-Si-O2 and Si-O2-(Ga,Al), in the O2-Si-O2-(Ga,Al) line causes the increase of their anisotropy of crystal structures. Elastic constants related to the z-axis, i.e., cE33 and cE44, increase significantly after Al substitution, which is attributed to the increase in the anisotropy of the crystal structures.
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页数：7
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