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Cooling Rate Effects on the Microstructure, Magnetic Properties, and DC Superposition Behavior of NiCuZn Ferrites
Author(s) -
Hsiang HsingI,
Wu JhaoLing
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12318
Subject(s) - materials science , grain boundary , microstructure , copper , ferrite (magnet) , superposition principle , sintering , permeability (electromagnetism) , grain size , saturation (graph theory) , composite material , magnetization , metallurgy , condensed matter physics , magnetic field , physics , mathematics , quantum mechanics , combinatorics , membrane , biology , genetics
This study investigated the cooling rate effects on the magnetic properties of NiCuZn ferrites. A copper‐rich phase segregated near the grain boundaries during sintering was observed. The amount of copper‐rich precipitates depends strongly on the cooling rate and decreases with decreasing cooling rate. The quenched sample exhibited superior initial permeability and DC ‐bias‐superposition characteristics due to the highest saturation magnetization and a thick nonmagnetic second phase segregated at the grain boundaries. A NiCuZn ferrite with superior initial permeability and DC superposition characteristics can be obtained by controlling the cooling rate to adjust the copper‐rich precipitate thickness at the grain boundaries.