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• W64116789 abstract "In this work, three series of soft ferrites were synthesized via solid state route. Theseare Nio.3-xCu,Zno.7Fe20(4x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30), Ni0.S-.C&Zno.~Fe204 (x=O.O, 0.1, 0.2, 0.3, 0.4, and 0.5) and Y3..NdxFes0~2 (x=O.O, 0.4,0.8, 1.2 and 1.6). The X-ray diffraction patterns showing single phases for these threesamples series, confirmed that the spinel and garnet structure had been formed in theNi-Zn ferrites and YIG respectively.Ni-Zn ferrites substituted with copper oxide showed exaggerated grain growthwhereas the other series substituted with cobalt oxide had no massive changes in themicrostructure. For the YIG substituted with neodymium oxide, the first sampleexhibited a porous microstructure and developed to become a more compact andporeless microstructure as neodymium increased.Measurement of the electrical properties was carried out in the temperature rangefrom 28°C to 300°C in the low frequency region of 10 Hz to 1 MHz. Impedance analyzer was employed in the ac data acquisition whereas a pico-ammeter and a dcvoltage source were used to measure electric current at different voltages.The results obtained from dielectric measurements indicate that microstructure of thesamples plays an important role in the dielectric dispersion. A sample with higherporosity is associated with a low value of dielectric permittivity due to its highresistivity. Meanwhile a sample with a more compact structure exhibits higherdielectric permittivity due to its higher conductivity. Hence, electron hoppingbetween ~ ean~d ~+e w~ou'ld increase in the conductive sample and give higherdielectric permittivity if compared with the resistive one.The dielectric response for every sample in the three series of soft ferrites displayeddifferent mechanisms throughout the investigated temperature range. Therefore,dielectric behaviour of a sample can be modeled into at least two equivalent circuits.The complex impedance plots of both samples Ni-Zn ferrites and YIG showedoverlapping semicircles. However, at high temperature the high frequency arcdisappeared and there remained just one semicircle. The center of the semicircle forall samples was depressed below the real impedance axis and described by theparameter a. The results indicate that all these three series of soft ferrites can berepresented by two parallel RC circuits connected in series that correspond to thecontributions of grain and grain boundary.The ac conductivity for the three series of soft ferrites showed almost similarbehaviour. At lower temperature, the ac curves can be divided into two region. The low frequency region showed that the ac conductivity was weakly dependent onfrequency whereas at high frequency region, it was strongly dependent on frequency.As the temperature increased, the ac conductivity seemed independent of frequency.Extrinsic and intrinsic conductions had been inferred to occur in these samples.It is also found that microstructural entities such as grains and porosity play animportant role in the dc resistivity. The two activation energies obtained indicatedthat there were probably two parallel conduction mechanisms or spin reorientationphase transition occurred." @default.
• W64116789 created "2016-06-24" @default.
• W64116789 creator A5028606935 @default.
• W64116789 date "2006-01-01" @default.
• W64116789 modified "2023-09-24" @default.
• W64116789 title "Dielectric Properties of Nd-Doped Yttrium Iron Garnet and Cu Or Co-Doped Nickel Zinc Ferrites" @default.
• W64116789 hasPublicationYear "2006" @default.
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