ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The preparation of glasses in the CoO-Fe2O3-B2O3 system is described and it is shown that the magnetic spinel cobalt ferrite (CoFe2O4) can be obtained in precipitate when the glasses are heat-treated. The identity of the crystalline phase is established by means of Mössbauer spectroscopy. It is shown that the magnetic properties of the glass-ceramics can be controlled by means of the heat-treatment schedule and intrinsic coercivities as high as 1900 Oe are recorded. The magnetic properties of the as-cast and heat-treated material are discussed generally in terms of superparamagnetic, single domain and multi-domain behaviour. The highest values of the intrinsic coercivity and remanence are compared to those calculated for an assembly of non-interacting single domain particles with positive cubic magnetocrystalline anisotropy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00551841
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