Characteristics of rutile single crystals grown under two different oxygen partial pressures

Rutile single crystals with subgrain-boundary free were grown by a floating zone method (FZ) under two different specific oxygen partial pressure, 0.5 MPa and 1×103 Pa, and their structural and chemical properties were compared with each other. It was found that rutile crystals grown under the higher oxygen partial pressure experienced a melting growth behavior which produced bright and transparent crystals due to the concentration of interstitial Ti3+ ions, but rutile crystals grown under the lower oxygen partial pressure exhibited a deep dark color of the whole crystal due to their solid state growth behaviors.