NDLI: Electric and magnetic properties of Y-type Ba$_{2}$Mg$_{2}$Fe$_{12}$O$_{22}$ hexaferrites with various Co doping

Content Provider	Springer Nature Link
Author	Wu, Meixia Liu, Laijun Gao, Xingsen Liu, Zhongwu
Copyright Year	2016
Abstract	Y-type hexaferrites Ba$_{2}$Mg$_{2−x }$Co$_{ x }$Fe$_{12}$O$_{22}$ (x = 0.4, 0.8, 1.2, 1.6) were synthesized by solid state reaction method. The impedance spectrum, AC conductivity, and dielectric properties were investigated at various temperatures and in a wide range of frequency. The dielectric properties and AC conductivity have been explained on the basis of space charge polarization and the electric exchange between Fe$^{3+}$ and Fe$^{2+}$ as well as the hole hopping between Co$^{2+}$ and Co$^{3+}$ ions at octahedral side. The complex impedance analysis indicates the existence of space charge and the presence of electrical processes at increased temperatures. The change of the activation energy obtained from lnf $_{max}$ versus 1/T and lnσ $_{dc}$ versus 1/T plots indicated that with increasing Co content, the transport mechanisms at low and high temperatures are different. Two magnetic phase transitions were observed in these samples and their transition temperatures increased with increasing Co$^{2+}$ doping. High Co content suppresses the second magnetic structure transition under an applied magnetic field. For all samples, the room temperature coercivity is less than 20 Oe, while the saturation magnetization increases with increasing Co content. The present work provides a fundamental understanding of the dielectric and conductivity mechanism of Mg$_{2}$Y type hexaferrite, which is essential for microwave and electronic applications in the materials.
Starting Page	10516
Ending Page	10524
Page Count	9
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	27
Issue Number	10
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-06-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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