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

doi:10.4028/www.scientific.net/KEM.508.247

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 proceeding › Conference 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 Ca_3-xNbGa_3+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 language	English
Title of host publication	Materials Integration
Publisher	Trans Tech Publications Ltd
Pages	247-252
Number of pages	6
ISBN (Print)	9783037853764
DOIs	https://doi.org/10.4028/www.scientific.net/KEM.508.247
Publication status	Published - 2012
Event	Int. 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 1 → 2011 Dec 2

Publication series

Name	Key Engineering Materials
Volume	508
ISSN (Print)	1013-9826
ISSN (Electronic)	1662-9795

Other

Other	Int. 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
Country/Territory	Japan
City	Sendai
Period	11/12/1 → 11/12/2

Keywords

Congruent composition
Langasite single crystal
Second phase
TG-DTA

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.4028/www.scientific.net/KEM.508.247

Cite this

Futami, Y., Yokota, Y., Sato, M., Tota, K., Pejchal, J., Yanagida, T., Onodera, K., & Yoshikawa, A. (2012). Study on phase diagram of Ca₃NbGa₃Si ₂O₁₄ piezoelectric material by differential thermal analysis and X-ray diffraction measurement. In Materials Integration (pp. 247-252). (Key Engineering Materials; Vol. 508). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.508.247

Study on phase diagram of Ca₃NbGa₃Si ₂O₁₄ piezoelectric material by differential thermal analysis and X-ray diffraction measurement. / Futami, Yoshisuke; Yokota, Yuui; Sato, Masato et al.
Materials Integration. Trans Tech Publications Ltd, 2012. p. 247-252 (Key Engineering Materials; Vol. 508).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Futami, Y, Yokota, Y, Sato, M, Tota, K, Pejchal, J, Yanagida, T, Onodera, K & Yoshikawa, A 2012, Study on phase diagram of Ca₃NbGa₃Si ₂O₁₄ piezoelectric material by differential thermal analysis and X-ray diffraction measurement. in Materials Integration. Key Engineering Materials, vol. 508, Trans Tech Publications Ltd, pp. 247-252, Int. 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, 11/12/1. https://doi.org/10.4028/www.scientific.net/KEM.508.247

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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.",

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AB - 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.

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