Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 14, Pages 1934-1938Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2010.01.010
Keywords
MgO additive; Hexagonal ferrite; High-frequency; Electromagnetic properties
Funding
- National Fund of China [50872017]
- Foundation for Innovative Research Groups of NSFC [60721001]
- International S&T Cooperation Program of China [2006DFA53410]
- National Basic Research Program of China [2007CB31407]
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MgO was introduced into low-temperature sintered Z-type hexaferrites in order to improve their high-frequency electromagnetic properties. In the doped samples the major Z-type phase coexists with a small amount of W-type magnetoplumbite phase. The addition of MgO causes a decrease of the average grain size and an increase of the magnetocrystalline anisotropy (K(1)) and saturation magnetization (M(s)) with the increment of K(1) being larger than that of M(s). These factors result in a reduce of the initial permeability. Also, the samples with MgO additive exhibit higher Q-factor and dc resistivity. Furthermore, the introduction of MgO can decrease the dielectric constant and improve the dielectric loss tangent of the samples by reducing the electronic transition in octahedral site (B-site) between Fe(2+) and Fe(3+) ions. (C) 2010 Elsevier B.V. All rights reserved.
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