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Low‐Temperature Sintering and Electromagnetic Properties of Copper‐Modified Z‐type Hexaferrite
Author(s) -
Zhang Hongguo,
Li Longtu,
Wang Yongli,
Zhou Ji,
Yue Zhenxing,
Gui Zhilun
Publication year - 2002
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.1151-2916.2002.tb00242.x
Subject(s) - copper , sintering , materials science , microstructure , lattice constant , solid solution , stoichiometry , metallurgy , analytical chemistry (journal) , cobalt , fabrication , composite material , diffraction , chemistry , medicine , physics , alternative medicine , organic chemistry , chromatography , pathology , optics
The influence of the substitution of copper for cobalt on the low‐sintering densification, microstructure, lattice parameters, and electromagnetic properties of planar Z‐type hexaferrites, which have a stoichiometric composition of Ba 3 Co 2(10.8− x ) ‐Zn 0.4 Cu 2 x Fe 24 O 41 , were investigated. The experimental results show that densification of the copper‐substituted hexaferrite is dependent on the amount of copper substitution and sintering temperatures. XRD analysis reveals that the solid solubility of copper in Z‐type hexaferrite is limited to x ≤ 0.30. At the same time, the lattice parameters ( a and c ) of Z‐type hexaferrites with copper substitution showed a small change, that is, decrease of a parameter in the basal plane and increase of the c axial. Moreover, the microstructure becomes more homogeneous and intragranular pores decrease considerably, but the temperature‐stable range of the Z‐type phase formation is narrow. The copper‐substituted hexaferrites, with x = 0.20 and sintered at ∼1125°C for 4 h, resulted in a high density sample of ∼4.68 g/cm 3 as the optimal value, good magnetic properties, and the enormous potentiality for fabrication of multilayer chip inductors used in hyper‐frequencies.