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Einfluß des Kationenleerstellengehaltes auf die Lage des Curie‐Punktes der MnZn‐Ferrite
Author(s) -
Vogler G.
Publication year - 1971
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19714820307
Subject(s) - curie temperature , spinel , materials science , sintering , annealing (glass) , ion , oxygen , analytical chemistry (journal) , ferrite (magnet) , stoichiometry , lattice constant , vacancy defect , nuclear magnetic resonance , condensed matter physics , metallurgy , chemistry , ferromagnetism , physics , organic chemistry , chromatography , diffraction , optics , composite material
A Curie point shift in MnZnFe‐ferrites after sintering or annealing at small partial oxygen pressures between 10 −1 and 10 −3 Torr at 1200°C was measured. The effect is explained with the increasing number of Zn‐ions on B‐sites and Fe 3− ‐ions on A‐sites of the spinel lattice at high temperatures. Because of the small cation vacancy concentration at these partial oxygen pressures, the Zn‐ions on B‐sites cannot return on the A‐sites during cooling and the Curie point is shifted to higher temperatures. The Curie point shift can be used to determine the stoichiometric state of MnZnFe‐ferrites, if the desaccommodation method and the determination of the active oxygen cannot be used.