Crystal growth of Ca3Nb(Ga1-xAlx)3Si2O14 piezoelectric single crystals with various al concentrations

Yuui Yokota; Tetsuo Kudo; Yuji Ohashi; Andrey Medvedev; Shunsuke Kurosawa; Kei Kamada; Akira Yoshikawa

doi:10.3390/ma8095264

Crystal growth of Ca₃Nb(Ga_1-xAl_x)₃Si₂O₁₄ piezoelectric single crystals with various al concentrations

Yuui Yokota, Tetsuo Kudo, Yuji Ohashi, Andrey Medvedev, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa

Tohoku University

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Ca₃Nb(Ga_1-xAl_x)₃Si₂O₁₄ (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (μ-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.

Original language	English
Pages (from-to)	5597-5605
Number of pages	9
Journal	Materials
Volume	8
Issue number	9
DOIs	https://doi.org/10.3390/ma8095264
Publication status	Published - 2015

Keywords

Langasite
Micro-pulling-down method
Piezoelectric crystal
Single crystal

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title = "Crystal growth of Ca3Nb(Ga1-xAlx)3Si2O14 piezoelectric single crystals with various al concentrations",

abstract = "Ca3Nb(Ga1-xAlx)3Si2O14 (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (μ-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.",

keywords = "Langasite, Micro-pulling-down method, Piezoelectric crystal, Single crystal",

author = "Yuui Yokota and Tetsuo Kudo and Yuji Ohashi and Andrey Medvedev and Shunsuke Kurosawa and Kei Kamada and Akira Yoshikawa",

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T1 - Crystal growth of Ca3Nb(Ga1-xAlx)3Si2O14 piezoelectric single crystals with various al concentrations

AU - Yokota, Yuui

AU - Kudo, Tetsuo

AU - Ohashi, Yuji

AU - Medvedev, Andrey

AU - Kurosawa, Shunsuke

AU - Kamada, Kei

AU - Yoshikawa, Akira

PY - 2015

Y1 - 2015

N2 - Ca3Nb(Ga1-xAlx)3Si2O14 (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (μ-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.

AB - Ca3Nb(Ga1-xAlx)3Si2O14 (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (μ-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.

KW - Langasite

KW - Micro-pulling-down method

KW - Piezoelectric crystal

KW - Single crystal

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DO - 10.3390/ma8095264

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JO - Materials

JF - Materials

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ER -

Crystal growth of Ca₃Nb(Ga_1-xAl_x)₃Si₂O₁₄ piezoelectric single crystals with various al concentrations

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