Abstract
An oxide of titanium, apparently Ti2O3, showed solid solubility in Al2O3 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 TiO2, 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 Ti4+ ions.
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