Accession Number : AD0478364

Title :   SINGLE CRYSTAL HEXAGONAL FERRITES.

Descriptive Note : Final rept. no. 8, 15 Apr 63-31 May 65,

Corporate Author : RAYTHEON CO WALTHAM MASS RESEARCH DIV

Personal Author(s) : Van Hook ,J.

Report Date : JAN 1966

Pagination or Media Count : 79

Abstract : The solubility relationships were determined between several axial and planar hexagonal ferrites and a number of oxide solvent materials used in ferrite single crystal growth. Large single crystals (>2cc) of barium ferrites (H = 17,000Oe) and barium ferrite with Al and with Co and Ti substituting for Fe were grown from NaFeO2 by conventional slow cooling (1.5 C per hr) of melts contained in platinum crucibles. Planar single crystals of (ZnMn)Y were grown principally from barium borate (2BaO-B2O3) solvent compositions by slow cooling of melts with and without seeding and seed rotation techniques. Seeding without rotation holds no advantage over the uncontrolled nucleation in conventional solvent growth, but seed rotation results in single crystals one to two orders of magnitude larger. Planar ferrite single crystals up to 15 grams have been produced during this contract. (Author)

Descriptors :   (*CRYSTAL GROWTH, FERRITES), (*FERRITES, SINGLE CRYSTALS), SYMMETRY(CRYSTALLOGRAPHY), BARIUM ALLOYS, IRON ALLOYS, SUBSTITUTES, ALUMINUM, COBALT, TITANIUM, ZINC ALLOYS, MANGANESE ALLOYS, YTTRIUM COMPOUNDS, MAGNETIC PROPERTIES, ELECTRICAL PROPERTIES, DIRECT CURRENT, ELECTRICAL RESISTANCE, RESONANCE, X RAY DIFFRACTION, FLUORESCENCE, YTTRIUM, IRON, GARNET, BARIUM COMPOUNDS, BORATES, X RAYS, CRYSTAL LATTICES, FERROMAGNETIC MATERIALS

Subject Categories : Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE