Abstract
The single crystals of rutile were grown from the flux of the system Li2WO4–WO3. Their growth habits varied through three types, {110}>{101}, {110}>{111} and {111}>{110}≈{253}, with increasing WO3 in the flux melt. TiO2 solubility was measured to determine the reactivity between TiO2 and WO4 or WO6 species in the flux melt. The heat of solution of TiO2 into the Li2WO4 melt was determined to be 49 kcal/mol, and decreased markedly by adding WO3 owing to the large reactivity of TiO2 with WO3 (or WO6).
It is inferred that the habit modification of rutile was attributed to the steric interaction of WO6 species which were epitaxially adsorbed on the growing surfaces.
