High-temperature phase equilibria of the magnesium-niobium-titanate system

Robert I. Mangham, William Petuskey

Research output: Contribution to journalArticlepeer-review


The high-temperature phase equilibria for the MgO-Nb2O5-TiO2 system have been determined in air and at 1 atm O2. Three isothermal sections, namely 1450°, 1350°, and 1250°C, were determined experimentally. From this, the 1000°C isothermal section was deduced by extrapolation. Throughout each diagram, most compounds were found to have an extended range of solubility, each exhibiting the same substitutional pattern of the combination 13(MgNb2)4+ replacing Ti4+. Furthermore, entropic stabilization because of cation mixing is evident for all phases except for the columbite solid solution, in which case the solid solution range decreased with increasing temperature.

Original languageEnglish (US)
Pages (from-to)3192-3197
Number of pages6
JournalJournal of the American Ceramic Society
Issue number11
StatePublished - Nov 2005

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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