Structural, electrical and magnetic properties of Cu1−xZnxFe2O4 ferrites (0≤x≤1)

Ajmal, Muhammad; Maqsood, Asghari

doi:10.1016/j.jallcom.2007.06.019

Cited by 102 publications

(33 citation statements)

References 20 publications

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“…Thus, the polarization formation depends directly on the accumulation of charge via conducting in the grain interior. For ferrite materials, the polarization mechanism is related to the conduction in the bulk ceramics, and electron exchange between Fe 2+ and Fe 3+ resulting in the local displacement of the electrons [27][28][29]. Therefore, the dielectric dispersion characteristics of the NCZFO samples can be attributed to the transport of the charge carriers in the grain interiors.…”

Section: Resultsmentioning

confidence: 99%

High Dielectric Permittivity and Maxwell–Wagner Polarization in Magnetic Ni0.5Cu0.3Zn0.2Fe2O4 Ceramics

Laokul

Thongbai

Yamwong

et al. 2011

J Supercond Nov Magn

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Nanocrystalline Ni 0.5 Cu 0.3 Zn 0.2 Fe 2 O 4 (NCZFO) powder was fabricated by a modified sol-gel method and then the compacted powder of NCZFO was sintered at 950, 1000, and 1100 • C for 6 h. The dielectric and electrical properties of sintered samples were investigated as functions of frequency and temperature. All of the NCZFO samples exhibit the high dielectric response behavior and show the Debye-like relaxation, which is attributed to the Maxwell-Wagner polarization and thermally activated mechanisms. The impedance spectroscopy analysis reveals that the NCZFO ceramics are electrically heterogeneous. The sintering temperature has significant influence on the dielectric dispersion behavior of the NCZFO samples, which should be mainly attributed to the large variation of the grain conduction activation energies.

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Section: Resultsmentioning

confidence: 99%

High Dielectric Permittivity and Maxwell–Wagner Polarization in Magnetic Ni0.5Cu0.3Zn0.2Fe2O4 Ceramics

Laokul

Thongbai

Yamwong

et al. 2011

J Supercond Nov Magn

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“…This observed increase in densities is attributed to differences in atomic masses of Cd (112.41) and Mn (54.93). Since greater atomic mass Cd 2+ replaces the Mn 2+ this affects the density and volume of unit cell of synthesized material [14]. Figure 1c shows the correlation between the porosity and measured density as a function of dopant concentration (x) for the prepared nanoferrites.…”

Section: X-rays and Sem Analysismentioning

confidence: 99%

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

Faraz

Ahmad

2011

J Supercond Nov Magn

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Spinel mixed Li-ferrites with incorporation of various dopants (Cd 2+ and Ni 2+ ) concentration in ranges 0.00 ≤ x ≤ 0.80 are prepared using sol-gel technique. The various phases, lattice constant/parameter, X-ray density and crystallite size are confirmed using X-ray diffraction (XRD). The particle size and lattice parameters are found in the range 15-33 nm and 8.35-8.66 Å. This confirmed that incorporating dopant strongly influences the material structure and an increase is observed in lattice parameter and particle size with increase in dopant concentration. The structure is influenced by the dopant position, at the octahedral (B) and tetrahedral (A) sites. The decrease in activation energy (E) is observed with increase in dopant concentration. Furthermore, analysis of the crystallite size and morphology is done using scanning electron microscopy (SEM), which confirmed that the observed particle size is comparable with the X-ray diffraction (XRD) results. The dopant affects electrical properties such as dc electrical resistivity and drift mobility. The observed trend for drift mobility and dc electrical resistivity confirmed the semiconducting behavior of the synthesized material. The magnetic parameters saturation magnetization (M s ), remanence (M r ) and coercivity (H c ) are strongly affected by dopant concentration. A sudden increase in magnetic parameters M r and M s is observed A. Faraz ( ) Thermal Transport Laboratory (TTL), School of chemical and materials Engineering (by incorporating a small amount of dopant up to x = 0.40 and with further incorporation cause a decrease in the values of these parameters due to the non-magnetic behavior of incorporating dopant Cd 2+ ions. These decreases in values can be explained using the spin canted model and cations positioning at tetrahedral (A) and octahedral (B) sites. The decrease in Curie temperature, observed with increase in dopant incorporation, is due to the decrease/weakening interaction between tetrahedral (A) and octahedral (B) sites.

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“…The electron exchange between Fe 3+ and Fe 2+ gives local displacement of electron in the direction of the applied electric field and consequently induces electric polarization. Beyond a certain frequency, the electron exchange does not follow the alternating field and so the dielectric constant reaches a constant and small value (Wagner, 1913;Murthy and Sobhanadri, 1976;Kharabe et al, 2006;Ajmal and Maqsood, 2008). In addition, from Fig.…”

Section: ε' and ε"mentioning

confidence: 93%

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

Eltabey

Hassan²,

Ali

2014

American Journal of Applied Sciences

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Ferrite samples with chemical formula Mg x Cu 0.5-x Zn 0.5 Fe 2 O 4 (x = 0.0, 0.2 and 0.4) was prepared by the conventional ceramic method. The enhanced changes in the dc/ac resistivity and the dielectric constant due to γ-rays irradiation by 60 Co source were measured using the two probes technique. The samples showed decreasing of their resistivity at room temperature after irradiation for both dc and ac applied electric fields. Temperature dependence curves of the dc resistivity, before and after irradiation, showed three regions with different activation energies. It was also observed that the activation energy decreased after irradiation at every region. The frequency dependence of ac resistivity and dielectric constant parameters were investigated before and after irradiation process. Both real part (ε') and imaginary part (ε'') of the dielectric constant were decreased due to irradiation. These results were discussed in the view of gamma rays interaction with ferrite lattice.

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Structural, electrical and magnetic properties of Cu1−xZnxFe2O4 ferrites (0≤x≤1)

Cited by 102 publications

References 20 publications

High Dielectric Permittivity and Maxwell–Wagner Polarization in Magnetic Ni0.5Cu0.3Zn0.2Fe2O4 Ceramics

High Dielectric Permittivity and Maxwell–Wagner Polarization in Magnetic Ni0.5Cu0.3Zn0.2Fe2O4 Ceramics

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

THE ELECTRICAL PROPERTIES OF Mg-Cu-Zn FERRITES IRRADIATED BY Î³-RAYS OF <sup>60</sup>Co SOURCE

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