Production and Magnetic Properties of Nanocomposites Made of Ferrites and Ceramic Matrices

Abstract

This investigation deals with the production of materials containing a dispersion of magnetic nanoparticles in an insulating matrix. Such a distribution of magnetic centers is expected to absorb electromagnetic radiation in a range of wavelengths. Wustite-magnetite and magnesia-magnesioferrite nanocrystalline ceramics have been prepared by mechanical milling and spark plasma sintering. As-milled powders have a nanocrystalline structure in both systems. Low energy milling gives rise to an increasingly higher volume fraction of wustite as a function of milling time in the Fe(1-x)O-Fe3O4 system. Similar results are obtained in the MgO-MgFe2O4 system with increasingly larger amounts of MgFe2O4 produced by milling. Composites of magnetic particles (Fe3O4 or MgFe2O4) in a nonconductive matrix (FeO or MgO, respectively) are found in the sintered samples. Measurement of magnetic properties can be used to determine conclusively the nature of the developed phases and the effect of grain size.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2001
Accession Number
ADP012205

Entities

People

  • A. Huerta
  • H. A. Calderon
  • K. Cornett
  • M. Umemoto

Organizations

  • Toyohashi University of Technology

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Composite Materials
  • Diffraction
  • Dispersions
  • Electron Microscopy
  • Grain Size
  • Magnetic Domains
  • Magnetic Materials
  • Magnetic Properties
  • Materials
  • Materials Processing
  • Measurement
  • Nanocomposites
  • Particles
  • Physical Properties
  • Production
  • Solid Solutions
  • Spectra

Fields of Study

  • Materials science
  • Physics

Readers

  • Powder metallurgy of Titanium alloys.
  • Superconducting Magnet Technology

Technology Areas

  • Biotechnology
  • Microelectronics