Premium
Nickel‐Zinc Ferrites: I, Effect of Composition on the Magnetic Properties of a Nickel‐Zinc‐(Cobalt) Ferrite
Author(s) -
BROCKMAN F. G.,
MATTESON K. E.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb16004.x
Subject(s) - nickel , zinc , electrical resistivity and conductivity , cobalt , ferrite (magnet) , materials science , stoichiometry , metallurgy , beta ferrite , zinc ferrite , composition (language) , analytical chemistry (journal) , chemistry , austenite , microstructure , composite material , physics , linguistics , philosophy , chromatography , quantum mechanics
By varying the mole percent of Fe 2 O 3 in a nickel‐zinc‐(cobalt) ferrite in very small increments, it was found that an optimum composition exists. Deviations from this composition as small as 0.1% can cause a decrease in resistivity by e.g. a factor of 1000. The ferrite is stoichiometric at the optimum composition, and its resistivity has a narrow, sharp maximum; the μ o Q product is also maximal. Such a coincidence has not been previously observed. The usual eddy‐current relation between resistivity and ac losses fails to explain this phenomenon because of the very high resistivities involved.