The solid-solution region for the langasite-type Ca3TaGa3Si2O14 crystal as determined by a lever rule

Hengyu Zhao; Satoshi Uda; Kensaku Maeda; Jun Nozawa; Haruhiko Koizumi; Kozo Fujiwara

doi:10.1016/j.jcrysgro.2014.12.042

The solid-solution region for the langasite-type Ca₃TaGa₃Si₂O₁₄ crystal as determined by a lever rule

Hengyu Zhao, Satoshi Uda, Kensaku Maeda, Jun Nozawa, Haruhiko Koizumi, Kozo Fujiwara

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A lever rule was applied to data concerning the compositions and proportions of secondary phases coexisting with a Ca₃TaGa₃Si₂O₁₄ (CTGS) matrix to determine the boundary compositions of the solid-solution region for CTGS at 1320 °C, as a means of ascertaining the solid-solution for the langasite-type phase in the quaternary CaO-Ta₂O₅-Ga₂O₃-SiO₂ system. The compositions and proportions of secondary phases were assessed by electron probe micro-analysis as well as through back-scattered electron images. The experimental results showed that the narrow solid-solution region for CTGS is located in a Ta-poor, Ga-poor and Si-rich region relative to its stoichiometric composition.

Original language	English
Pages (from-to)	111-117
Number of pages	7
Journal	Journal of Crystal Growth
Volume	415
DOIs	https://doi.org/10.1016/j.jcrysgro.2014.12.042
Publication status	Published - 2015 Apr 1

Keywords

A1. Lever rule
A1. Phase diagrams
A1. Solid solution
B1. Oxides

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1016/j.jcrysgro.2014.12.042

Cite this

@article{c684d76e193d4dbc932315611896c08f,

title = "The solid-solution region for the langasite-type Ca3TaGa3Si2O14 crystal as determined by a lever rule",

abstract = "A lever rule was applied to data concerning the compositions and proportions of secondary phases coexisting with a Ca3TaGa3Si2O14 (CTGS) matrix to determine the boundary compositions of the solid-solution region for CTGS at 1320 °C, as a means of ascertaining the solid-solution for the langasite-type phase in the quaternary CaO-Ta2O5-Ga2O3-SiO2 system. The compositions and proportions of secondary phases were assessed by electron probe micro-analysis as well as through back-scattered electron images. The experimental results showed that the narrow solid-solution region for CTGS is located in a Ta-poor, Ga-poor and Si-rich region relative to its stoichiometric composition.",

keywords = "A1. Lever rule, A1. Phase diagrams, A1. Solid solution, B1. Oxides",

author = "Hengyu Zhao and Satoshi Uda and Kensaku Maeda and Jun Nozawa and Haruhiko Koizumi and Kozo Fujiwara",

note = "Funding Information: The authors would like to express their thanks to Mr. Y. Murakami, IMR, Tohoku University, for EPMA measurements, BEI observations and XRD analyses. This work was partially supported by the Global COE Program “Materials Integration International Center of Education and Research, Tohoku University”, MEXT, Japan . Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = apr,

day = "1",

doi = "10.1016/j.jcrysgro.2014.12.042",

language = "English",

volume = "415",

pages = "111--117",

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T1 - The solid-solution region for the langasite-type Ca3TaGa3Si2O14 crystal as determined by a lever rule

AU - Zhao, Hengyu

AU - Uda, Satoshi

AU - Maeda, Kensaku

AU - Nozawa, Jun

AU - Koizumi, Haruhiko

AU - Fujiwara, Kozo

N1 - Funding Information: The authors would like to express their thanks to Mr. Y. Murakami, IMR, Tohoku University, for EPMA measurements, BEI observations and XRD analyses. This work was partially supported by the Global COE Program “Materials Integration International Center of Education and Research, Tohoku University”, MEXT, Japan . Publisher Copyright: © 2015 Elsevier B.V.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - A lever rule was applied to data concerning the compositions and proportions of secondary phases coexisting with a Ca3TaGa3Si2O14 (CTGS) matrix to determine the boundary compositions of the solid-solution region for CTGS at 1320 °C, as a means of ascertaining the solid-solution for the langasite-type phase in the quaternary CaO-Ta2O5-Ga2O3-SiO2 system. The compositions and proportions of secondary phases were assessed by electron probe micro-analysis as well as through back-scattered electron images. The experimental results showed that the narrow solid-solution region for CTGS is located in a Ta-poor, Ga-poor and Si-rich region relative to its stoichiometric composition.

AB - A lever rule was applied to data concerning the compositions and proportions of secondary phases coexisting with a Ca3TaGa3Si2O14 (CTGS) matrix to determine the boundary compositions of the solid-solution region for CTGS at 1320 °C, as a means of ascertaining the solid-solution for the langasite-type phase in the quaternary CaO-Ta2O5-Ga2O3-SiO2 system. The compositions and proportions of secondary phases were assessed by electron probe micro-analysis as well as through back-scattered electron images. The experimental results showed that the narrow solid-solution region for CTGS is located in a Ta-poor, Ga-poor and Si-rich region relative to its stoichiometric composition.

KW - A1. Lever rule

KW - A1. Phase diagrams

KW - A1. Solid solution

KW - B1. Oxides

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JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

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