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Behavior of oxygen bubbles during crystal growth of Ca 12 Al 14 O 33 by floating method in magnetic field
Author(s) -
Park J. K.,
Shimomura T.,
Yamanaka M.,
Watauchi S.,
Kishio K.,
Tanaka I.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410346
Subject(s) - magnetic field , oxygen , paramagnetism , magnet , crystal (programming language) , materials science , helium , oxygen gas , condensed matter physics , crystal growth , convection , analytical chemistry (journal) , chemistry , crystallography , thermodynamics , physics , chromatography , organic chemistry , quantum mechanics , computer science , programming language
Magnetic field generator using a helium‐free superconducting magnet was installed with an infrared light heating floating zone (FZ) apparatus. Single crystals of Ca 12 Al 14 O 33 , in which oxygen bubbles easily remain when it is grown by a conventional FZ, were grown in various magnetic conditions in order to investigate the behavior of oxygen bubbles in molten zone, and to research the magnetic effects on FZ growth. When the crystals were grown at the lower position than center of the magnet bore, where magnetic force to paramagnetic oxygen gas is upward, oxygen bubbles formed in the molten zone were inclined to go toward stronger field and the grown crystals were half transparent and half opaque. The distribution of remaining oxygen bubbles in crystals was rather lopsided than centered. These effects might be explained by the magnetic force effect and the magnetic convection effect driven by inhomogeneous heating of the melt.