Growth of Shape-Controlled Ca₃NbGa₃Si₂O₁₄ and Sr₃NbGa₃Si₂O₁₄ Single Crystals by Micro-Pulling-Down Method and Their Physical Properties

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概要

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• Shape-controlled langasite-type piezoelectric single crystals, Ca₃NbGa₃Si₂O₁₄ (CNGS) and Sr₃NbGa₃Si₂O₁₄ (SNGS), were grown by the micro-pulling-down (μ-PD) method and their physical properties were investigated. Columnar-shaped CNGS and SNGS crystals with $a$- and $c$-axes in the growth direction were grown and the diameters of the grown columnar-shaped crystals were controlled to be approximately 3 mm from the initial to the later part. The grown crystals without cracks indicated relatively high crystallinities and a single phase of the langasite-type structure in the powder X-ray diffraction patterns. Meanwhile, in the outside area of the crystals, parts of second phases were detected and energy dispersive X-ray spectroscopy measurements indicated that the second phases of the CNGS and SNGS crystals were the Ca--Nb--O and Sr--Nb--O systems, respectively. The $d_{11}$ of the CNGS crystal indicated 3.98 pC/N, which was coincident with those of previous reports.

• 2011-09-25

著者

• Yoshikawa Akira

  Institute For Materials Research

• Sato Masato

  Institute Of Clinical Medicine University Of Tsukuba

• Yanagida Takayuki

  New Industry Creation Hatchery Center (nlche) Tohoku University

• Yokota Yuui

  Institute For Materials Research Tohoku University

• Yanagida Takayuki

  New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan

• Tota Kazushige

  TDK Corporation, Nikaho, Akita 018-0193, Japan

• Futami Yoshisuke

  New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan

• Onodera Ko

  TDK Corporation, Nikaho, Akita 018-0193, Japan

• Sato Masato

  Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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