High-Temperature Phase Equilibria of the Magnesium-Niobium-Titanate System

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,...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-11, Vol.88 (11), p.3192-3197
Main Authors: Mangham, Robert I., Petuskey, William T.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Chemistry
Cross-disciplinary physics: materials science
rheology
Crystallization
Electrotechnical and electronic ceramics
Exact sciences and technology
High temperature
Ions
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of other materials
Physics
Technical ceramics
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Summary: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 1/3(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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00584.x