Study on phase diagram of Ca3NbGa3Si 2O14 piezoelectric material by differential thermal analysis and X-ray diffraction measurement

Yoshisuke Futami, Yuui Yokota, Masato Sato, Kazushige Tota, Jan Pejchal, Takayuki Yanagida, Ko Onodera, Akira Yoshikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ca3NbGa3Si2O14 (CNGS) is one of the langasite-type crystals and it is known as a piezoelectric material. We have successfully grown the shaped CNGS crystal using micro-pulling-down (μ-PD) method with shape control. However, the impurity phases such as Ca-Nb-O related compounds were detected in the grown crystals. The creation of the impurity phases is related to difference in stoichiometric and congruent compositions. Therefore, the detailed investigation of phase diagram on CNGS was carried out to prevent the impurity phases creation. It follows from the TG-DTA measurements that the melting point systematically changed with the Ca/Ga ratio in the Ca3-xNbGa3+xSi2O 14±δ cmpositions. The CNGS phase with Ca/Ga = 1.02 indicated the maximum melting point which suggests that the stoichiometric composition of CNGS is different in the congruent composition. Furthermore, in the DTA measurements the peaks of impurity phases were detected around 1550 °C for the CNGS sample with Ca/Ga = 1.02.

Original languageEnglish
Title of host publicationMaterials Integration
PublisherTrans Tech Publications Ltd
Pages247-252
Number of pages6
ISBN (Print)9783037853764
DOIs
Publication statusPublished - 2012
EventInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011 - Sendai, Japan
Duration: 2011 Dec 12011 Dec 2

Publication series

NameKey Engineering Materials
Volume508
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

OtherInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011
CountryJapan
CitySendai
Period11/12/111/12/2

Keywords

  • Congruent composition
  • Langasite single crystal
  • Second phase
  • TG-DTA

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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