Abstract
A new type of infrared-heated floating-zone (FZ) crystal apparatus was designed and fitted with a magnetic field generator utilizing a liquid-helium-free superconducting magnet to grow crystals under a high magnetic field. An ellipsoidal mirror and two different parabolic mirrors were combined to guide the heating light from a 5 kW xenon lamp to the growth stage placed inside a superconducting magnet. The distance between the heating lamp and the center of the magnet was set to 1.6 m to suppress the instability of the lamp caused by the leakage of the magnetic field. The approximate range of melting points achieved is from 900 to 1800 °C, as determined through the melting of various oxides. The effect of the magnetic field on crystal growth was experimentally investigated by growing Ca12Al14O33 crystals under several different magnetic conditions and focusing on the behavior of oxygen bubbles in the melt.
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