Dielectric and impedance properties’ studies of the of lead doped (PbO)-Co2Y type hexaferrite (Ba2Co2Fe12O22 (Co2Y))

Costa, M. M.; Júnior, G. F. M. P.; Sombra, A. S. B.

doi:10.1016/j.matchemphys.2010.03.026

Cited by 120 publications

(34 citation statements)

References 17 publications

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“…Up to now, many investigations have been focused on the dielectric properties and conductivity properties of Y-type hexaferrite, such as the Zn 2 Y hexaferrite [19,20], Co 2 Y hexaferrite [21][22][23], and Ni 2 Y hexaferrite [10,13,24]. However, there is few work related to the dielectric and conductivity properties of Mg 2 Y hexaferrite.…”

Section: Introductionmentioning

confidence: 99%

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Liu

Gao

et al. 2016

J Mater Sci: Mater Electron

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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 lnr 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.

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Section: Introductionmentioning

confidence: 99%

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Liu

Gao

et al. 2016

J Mater Sci: Mater Electron

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“…Two semicircular arcs are often obtained in Cole-Cole plot, when the grain boundary resistance is larger than that of the grain. The distribution of relaxation time, which results in deviation from ideal semicircles, is attributed to various factors, such as disorder in sample and inhomogeneity in microstructure [13]. Many physical properties of polycrystalline ferrites are very sensitive to the measuring temperature SM T .…”

Section: Introductionmentioning

confidence: 99%

“…Many physical properties of polycrystalline ferrites are very sensitive to the measuring temperature SM T . The grain (bulk) and grain boundary formed heterostructures are the two main components that determine resistivity, and depending on SM T , their electrical properties are more intriguing [13]. Thus, the information about the associated electrical parameters of the components on the heterostructures is important in understanding the overall properties of the materials [14].…”

Section: Introductionmentioning

confidence: 99%

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

2015

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Abstract:The electrical properties of Ni 0.27 Cu 0.10 Zn 0.63 Fe 2 O 4 (NCZF) prepared from auto combustion synthesis of ferrite powders have been studied by impedance and modulus spectroscopy. We studied frequency and temperature dependencies of impedance and electric modulus of NCZF in a wide frequency range (20 Hz-5 MHz) at different measuring temperatures SM T (30-225 ℃). The complex impedance spectra clearly showed both grain and grain boundary effects on the electrical properties. The observed impedance spectra indicated that the magnitude of grain boundary resistance gb R becomes more prominent compared to grain resistance b R at room temperature, and with the increase in SM T , gb R decreases faster than the intrinsic b R . The frequency response of the imaginary part of impedance showed relaxation behavior at every SM T , and the relaxation frequency variation with SM T appeared to be of Arrhenius nature and the activation energy has been estimated to be 0.37 eV. A complex modulus spectrum was used to understand the mechanism of the electrical transport process, which indicated that a non-Debye type of conductivity relaxation characterizes this material.

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“…Their region where the peak occurs is indicative of the transition from long-range to short-range mobility with increase in frequency. Further, the appearance of peak in the modulus spectrum provides a clear indication of conductivity relaxation [22]. The condition for observing maxima in (Mʺ) of a material is [23].…”

Section: Complex Modulus Analysismentioning

confidence: 99%

HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

Irfan¹

2016

Ceramics - Silikaty

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Dielectric and impedance properties’ studies of the of lead doped (PbO)-Co2Y type hexaferrite (Ba2Co2Fe12O22 (Co2Y))

Cited by 120 publications

References 17 publications

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

Complex impedance and electric modulus studies of magnetic ceramic Ni0.27Cu0.10Zn0.63Fe2O4

HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

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