Relationship between incongruent-melting langatate (La3Ta0.5Ga5.5O14) and associated phases in the system La2O3-Ga2O3-Ta2O5

Hiromitsu Kimura, Satoshi Uda, Xinming Huang

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The phase relationship between langatate (LTG, La3Ta0.5Ga5.5O14) and associated phases was studied. Equilibrium solid phase tie lines were obtained for the ternary system La2O3-Ga2O3-Ta2O5 by phase identification of sintered samples with various compositions through X-ray diffraction analysis. The solid solution range of LTG was determined in the temperature range of 1300-1350 °C. A new compound was identified that was stable above 1485 °C up to its melting point. Liquidus phases were investigated by in-situ observation of the crystallization process from melts having various compositions. Differential scanning calorimetry analysis was carried out to study the phase transitions associated with eutectic and peritectic reactions. On the basis of the results of these experiments, a primary phase diagram was established around LTG. It was concluded that LTG is an incongruent-melting compound and has a peritectic relation to LaGaO3.

Original languageEnglish
Pages (from-to)36-43
Number of pages8
JournalJournal of Crystal Growth
Issue number1
Publication statusPublished - 2006 Sept 15


  • A1. Phase diagrams
  • A1. Solid solutions
  • A2. Growth from melt
  • B1. Oxides
  • B2. Piezoelectric materials


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