Accession Number:

AD0260769

Title:

RESEARCH ON THE CHEMISTRY AND SINGLE CRYSTAL GROWTH OF MAGNETIC OXIDES

Descriptive Note:

Final rept.

Corporate Author:

RAYTHEON CO WALTHAM MA

Report Date:

1961-06-05

Pagination or Media Count:

113.0

Abstract:

Phase relationships in the liquidus range under different oxygen partial pressures are described for the oxide systems involving yttrium-iron garnet and yttrium-gadolinium-iron garnet phase. These data are applied to an analysis of the conditions for crystal growth of the incongruently melting garnet phase from oxide liquids as concerns the temperature-composition-oxygen pressure range for stable growth, and the composition of garnets crystallized under these conditions. Some preliminary results are presented on single crystal growth of yttrium-iron garnet by a modification of the Czochralski technique. Phase equilibrium data in the systemrium-gadolinium-iron garnet phases. These data are applied to an analysis of the conditions for crystal growth of the incongruently melting garnet phase from oxide liquids as concerns the temperature-composition-oxygen pressure range for stable growth, and the composition of garnets crystallized under these conditions. Some preliminary results are presented on single crystal growth of yttrium-iron garnet by a modification of the Czochralski technique. Phase equilibrium data in the systems Ni-Fe-O and Co-Fe-O are described with emphasis on the conditions necessary to prepare the spinel solid solutions Fe3O4-NiFe2O4 and Fe3O4-Co3O4. Cation distribution studies by x-ray diffraction techniques are given for single phase spinels in the system Mg-Fe-O as well as preliminary data for spinel composition preparation in the system FeAl-O. The effect of substitution of the cations Ni2, Co2 and Al3 for divalent andor trivalent iron on electrical conductivity in magnetite is discussed. Resistivity and thermoelectric data are given for a series of nickel ferrous ferrites a d the results are analyzed quantitatively.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE