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Phase Formation, Sintering Behavior, and Magnetic Properties of Low‐Temperature Fired Mg–Cu–Zn Ferrites
Author(s) -
Mürbe Julia,
Töpfer Jörg
Publication year - 2012
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.1551-2916.2012.05386.x
Subject(s) - sintering , ferrite (magnet) , materials science , curie temperature , analytical chemistry (journal) , microstructure , permeability (electromagnetism) , metallurgy , zinc , phase (matter) , ferromagnetism , chemistry , composite material , condensed matter physics , physics , chromatography , biochemistry , organic chemistry , membrane
The phase formation, sintering behavior, and magnetic properties of Mg – Cu – Zn ferrites with composition Mg 1− x − y Cu y Zn x + z Fe 2− z O 4− z /2 with 0.4 ≤ x ≤ 0.8; 0 ≤ y ≤ 0.35; and 0 ≤ z ≤ 0.06 were investigated. Ferrite formation from starting oxides is complete at 900°C. To guarantee sufficient densification at 900°C substoichiometric compositions with small iron deficiency z = 0.02 are required. Substitution of Cu for Mg with 0 ≤ y ≤ 0.35 in a ferrite with x = 0.5 has minor effect on permeability only; however, the shrinkage is significantly shifted to temperatures as low as T < 900°C. The permeability is mainly governed by the Zn concentration; μ increases from μ = 200 to 700 as x increases from x = 0.4 to 0.6, whereas simultaneously the Curie temperature is reduced from 180°C to 40°C, respectively. Mg – Cu – Zn ferrites represent an interesting alternative to Ni – Cu – Zn ferrites with large potential for multilayer applications.