Abstract
Rutile single crystals doped with Sc 2O 3 were grown by the floating zone (FZ) method. The as-grown crystals were yellowish and transparent after the growth run, whereas an as-grown pure rutile crystal is dark-blue and not transparent even if the crystal growth is done under an oxygen atmosphere. The Sc 3+ ions could substitute Ti 4+ sites in the rutile structure to form oxygen vacancies, via which oxide ions could easily diffuse as well in Y 2O 3-doped ZrO 2, and consequently transparent as-grown crystals were obtained. The formation of low-angle grain boundaries was appreciably suppressed, but not completely, with the addition of only Sc 2O 3. Simultaneous addition of Sc 2O 3 and ZrO 2 was effective to obtain transparent and grain-boundary-free rutile single crystals by the floating zone method.
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