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

Materials (Aug 2015)

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

Affiliations

Yuui Yokota: New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan
Tetsuo Kudo: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Miyagi, Sendai 980-8577, Japan
Yuji Ohashi: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Miyagi, Sendai 980-8577, Japan
Andrey Medvedev: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Miyagi, Sendai 980-8577, Japan
Shunsuke Kurosawa: New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan
Kei Kamada: New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan
Akira Yoshikawa: New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan

DOI: https://doi.org/10.3390/ma8095264
Journal volume & issue: Vol. 8, no. 9
pp. 5597 – 5605

Abstract

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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.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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