Aluminum Oxide‐Titanium Oxide Solid Solution

WILLIAM DEAN McKEE, EUGENE ALESHIN

doi:10.1111/j.1151-2916.1963.tb13771.x

Aluminum Oxide‐Titanium Oxide Solid Solution

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<jats:p>An oxide of titanium, apparently Ti<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, showed solid solubility in Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> of 1.0, 1.8, and 2.5 mole % at 1400°, 1600°, and 1700°C, respectively, when heated in hydrogen with a dew point of about ‐50°C. At the same temperatures in air, however, no indication of solid solubility (of TiO<jats:sub>2</jats:sub>, presumably) was found by X‐ray diffraction. It is concluded, therefore, that titania effects densification and grain growth of alumina by grain‐boundary action rather than by a defect mechanism in the corundum lattice resulting from the substitutional solution of Ti<jats:sup>4+</jats:sup> ions.</jats:p>