METHOD FOR PRODUCING ORTHOFERRITE SINGLE CRYSTALS

1294272 Zone-melting NIPPON ELECTRIC CO Ltd 6 Jan 1971 [5 Aug 1970] 695/71 Heading BIS While growing orthoferrite single crystals, by the floating zone-melting method, the formation of gas bubbles and pores, caused by slight variation from the stoichiometric proportions of Fe 2 O 3 to R 2 O 3 , (whe...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMURA S,JA, MAKINO H,JA, MATSUMI K,JA, OKADA T,JA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY CRYSTAL GROWTH METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Zusammenfassung:	1294272 Zone-melting NIPPON ELECTRIC CO Ltd 6 Jan 1971 [5 Aug 1970] 695/71 Heading BIS While growing orthoferrite single crystals, by the floating zone-melting method, the formation of gas bubbles and pores, caused by slight variation from the stoichiometric proportions of Fe 2 O 3 to R 2 O 3 , (where R is En, Tb, Y or Yb), is counteracted by operating in an atmosphere of oxygen at a pressure of from 1 to 10 Atmospheres. The polycrystalline orthoferrite feed rod is produced by conventional methods and fused to a seed crystal, for growth generally parallel to the c-axis. The greater the deviation from stoichrometric proportions, the greater the oxygen pressure required. A small proportion of the Fe 2 O 3 , may be replaced by Co 2 O 3 or a combination of CoO and TiO 2 .