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Orientation Superstructures and their Effects in Spinel Ferrites
Author(s) -
Marais A.,
Merceron T.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670240226
Subject(s) - spinel , anisotropy , materials science , diffusion , ionic radius , orientation (vector space) , magnetic anisotropy , crystallography , condensed matter physics , analytical chemistry (journal) , nuclear magnetic resonance , ion , chemistry , magnetization , metallurgy , magnetic field , thermodynamics , physics , chromatography , geometry , mathematics , organic chemistry , quantum mechanics
Orientation superstructures are examined using the magnetic diffusion after‐effect, the squareness ratio R , and the induced anisotropy K u , in the ferrites: Mn 0.2 Fe 2.8 O 4.014 , Cu x Mg 1−x Fe 2 O 4 (0.09 ≦ x ≦ 0.69), Mn 1+ x O 4 (0.1 ≦ x ≦ 0.8) and Fe 1.95 Ni 0.95 Co x × × Zn 0.1−x O 4 (0.02 ≦ x ≦ 0.1). In the temperature zones where disaccommodation occurs (due to the ionic or electronic diffusion), a uniaxial anisotropy can be formed with a corresponding increase of R . It is shown that a new type of electron transfer: Cu + ↔ Cu 2+ is responsible for the magnetic after‐effect in Mg‐Cu ferrites.