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

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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.
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Document Type: Research Article

Affiliations: Department of Chemistry, Arizona State University, Tempe, Arizona 85287

Publication date: November 1, 2005

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