The phase relations in the system In2O3-TiO2-MgO at 1100 and 1350°C

Noboru Kimizuka*, Francisco Brown, Maria J.R. Flores, Masaki Nakamura, Yuichi Michiue, Takahiko Mohri

*Corresponding author for this work

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The phase relations in the system In2O3-TiO2-MgO at 1100 and 1350°C are determined by a classical quenching method. In this system, there are four pseudobinary compounds, In2TiO5, MgTi2O5 (pseudobrookite type), MgTiO3 (ilmenite type), and Mg2TiO4 (spinel type) at 1100°C. At 1350°C, in addition to these compounds there exist a spinel-type solid solution Mg(2-x)In(2x)Ti(1-x)O4 (0 ≤ x ≤ 1) and a compound In6Ti6MgO22 with lattice constants a = 5.9236(7) Å, b = 3.3862(4) Å, c =6.3609(7) Å, β = 108.15(1)°, and q =0.369, which is isostrucrural with the monoclinic In3Ti2FeO10 in the system In2O3-TiO2-MgO. The relation between the lattice constants of the spinel phase and the composition nearly satisfies Vegard's law. In6Ti6MgO22 extends a solid solution range to In20Ti17Mg3O67 with lattice constants of a = 5.9230(5) Å, b =3.3823(3) Å, c =6.3698(6) Å, β = 108.10(5)°, and q =0.360. The distributions of constituent cations in the solid solutions are discussed in terms of their ionic radius and site preference effect.(C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)276-280
Number of pages5
JournalJournal of Solid State Chemistry
Issue number2
StatePublished - 2000

Bibliographical note

Funding Information:
One of the authors (N.K.) expresses his sincere thanks to Professor N. Ishizawa, Tokyo Institute of Technology, for his helpful discussion. A part of the present work was "nancially supported by the Japan International Cooperation Agency.


  • InFeO
  • InTiFeO
  • InTiMgO
  • MgInO
  • Phase relations
  • Pyrochlore-type


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