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Magnesioferrite formation in low-concentration Fe/MgO single crystals

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Abstract

Single crystals of MgO containing iron in concentrations from 310 to 12900 ppm have been examined by magnetic resonance and reflection electron diffraction before and after ageing in oxygen in the temperature range 600–800° C. Before ageing, only the e.s.r. spectrum of isolated Fe3+ ions in cubic sites was seen and the diffraction patterns revealed MgO alone. After ageing, a strong anisotropic line, centered near g=2.00 and exhibiting the characteristics of ferrimagnetic resonance, was found and its presence was coupled with the appearance of a spinel pattern superimposed on that of the MgO. Analysis of the variation of anisotropy field with ageing time gave estimates of the room-temperature magnetization, first anisotropy constant and Curie temperature of 258 emu cm−3, −2.7× 10−3 J cm−3 and 500±10 K, respectively, which, in view of the close agreement with published data, suggested magnesioferrite formation even at very low iron concentrations. In the initial stages of ageing a strong isotropic resonance line was observed which appeared to be a precursor of the anisotropic ferrimagnetic line.

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Author notes

  1. A. D. Inglis

    Present address: Chemistry Division, National Research Council, Ottawa, Canada

Authors and Affiliations

  1. Department of Applied Physics and Electronics, University of Durham, South Road, Durham, UK

    A. D. Inglis, G. J. Russell & J. S. Thorp

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  1. A. D. Inglis
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  2. G. J. Russell
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  3. J. S. Thorp
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Inglis, A.D., Russell, G.J. & Thorp, J.S. Magnesioferrite formation in low-concentration Fe/MgO single crystals. J Mater Sci 17, 2939–2946 (1982). https://doi.org/10.1007/BF00644673

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  • DOI: https://doi.org/10.1007/BF00644673

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