RESEARCH ON THE CHEMISTRY AND SINGLE CRYSTAL GROWTH OF MAGNETIC OXIDES

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 and/or 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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 05, 1961
Accession Number
AD0260769

Entities

People

  • A. E. Paladino
  • B. D. Roiter
  • H. J. Van Hook
  • R. L. Mozzi
  • T. Kohane

Organizations

  • RTX

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aluminum Oxides
  • Body Weight
  • Chemical Analysis
  • Chemical Synthesis
  • Chemistry
  • Crystal Growth
  • Crystal Structure
  • Crystallization
  • Crystals
  • Diffraction
  • Electrical Conductivity
  • Fermi Levels
  • Mixtures
  • Partial Pressure
  • Phase Diagrams
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.