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Materials 2015, 8(9), 5597-5605; doi:10.3390/ma8095264

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

1
New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan
2
Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Miyagi, Sendai 980-8577, Japan
3
Corporation 6-6-40, Aoba, Aramaki, Aoba-ku, Miyagi, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Lorena Pardo
Received: 2 June 2015 / Revised: 6 August 2015 / Accepted: 11 August 2015 / Published: 26 August 2015
(This article belongs to the Special Issue Piezoelectric Materials)
View Full-Text   |   Download PDF [2460 KB, uploaded 26 August 2015]   |  

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. View Full-Text
Keywords: langasite; piezoelectric crystal; single crystal; micro-pulling-down method langasite; piezoelectric crystal; single crystal; micro-pulling-down method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yokota, Y.; Kudo, T.; Ohashi, Y.; Medvedev, A.; Kurosawa, S.; Kamada, K.; Yoshikawa, A. Crystal Growth of Ca3Nb(Ga1−xAlx)3Si2O14 Piezoelectric Single Crystals with Various Al Concentrations. Materials 2015, 8, 5597-5605.

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