Transformation of the incongruent-melting state to the congruent-melting state via an external electric field for the growth of langasite

Satoshi Uda, Xinming Huang, Shinji Koh

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The imposition of an external electric field on a growth system affects the crystallization process in two manners: (i) the thermodynamic effect and (ii) the growth-dynamic effect. The former modifies the chemical potentials of associated phases in equilibrium which could convert the incongruent-melting state into congruent-melting state. Langasite (La3Ga 5SiO14), an incongruent-melting material in the ternary system of La2O3-Ga2O3-SiO 2, became congruent-melting under an external electric field of 600 V/cm. This conversion was attributed to the inversion of the stability relationship in terms of the molar free energy between the primary phase in equilibrium with liquid and the liquid phase at the composition of langasite. Such a transformation is generally possible when the electrical permittivities of liquid, primary phase and incongruent-melting material increase toward the end component of the primary phase.

Original languageEnglish
Pages (from-to)481-491
Number of pages11
JournalJournal of Crystal Growth
Volume281
Issue number2-4
DOIs
Publication statusPublished - 2005 Aug 1

Keywords

  • A1. Electric fields
  • A1. Growth models
  • A1. Phase diagrams
  • A1. Phase equilibria
  • A2. Growth from melt
  • B1. Oxides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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