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US 4,305,777 AGranted
Method of producing ferrite single crystals
AssigneeHitachi, Ltd.
InventorsToshio Kobayashi, Tetsu Oi
Life of this patent
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Abstract
A method of producing ferrite single crystals which comprises steps of melting a ferrite starting material in oxygen atmosphere containing nitrogen, argon or the like of a partial pressure of at least 0.1 atm. and solidifying the melt. According to this method, the popping out of the gas contained in the melt is prevented and the ferrite single crystals of high qualities can be produced easily.
Claims16
A method of producing ferrite single crystals from a melt comprising:
- (i) a step of melting a ferrite starting material in an atmosphere comprising at least one gas selected from the group consisting of rare-gases, nitrogen and carbon dioxide having a partial pressure of at least 0.1 atm and oxygen having a partial pressure higher than that in the air under a total pressure of at least 1 atm, and (ii) a step of solidifying the ferrite starting material molten in step (i) into a single crystal by anyone of the Bridgman's, Czochralski's, or the floating zone method, whereby popping of gas in the melt is substantially prevented.
Dependencies are inferred from the claim text.