Phase relations around langasite (La3Ga5SiO14) in the system La2O3-Ga2O3-SiO2 in air

Shou Qi Wang, Satoshi Uda

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Phase relations around langasite (LGS, La3Ga5SiO14) were studied on the basis of phase assemblage observed during calcination and crystallization process of samples of various compositions in the ternary system La2O3-Ga2O3-SiO2. A ternary compound of apatite structure, La14GaxSi9-xO39-x/2 was found for the first time. Crystallization of this compound was observed in the cooling process of molten samples of stoichiometric LGS as well as LGS single crystal, demonstrating that LGS is an incongruent-melting compound. A phase diagram was established primarily based on the crystallization sequence in the cooling process.

Original languageEnglish
Pages (from-to)463-470
Number of pages8
JournalJournal of Crystal Growth
Issue number3-4
Publication statusPublished - 2003 Apr
Externally publishedYes


  • A1. Phase diagrams
  • A2. Growth from melt
  • B2. Oxides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry


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