On the electrical behavior of nickel ferrite-gallates

Fayek, Mostafa; Mostafa, M. F.; Sayedahmed, F.M.; Ata‐Allah, S.S.; Kaiser, M. E.

doi:10.1016/s0304-8853(99)00612-5

Cited by 59 publications

(20 citation statements)

References 9 publications

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“…For spinel structures, the power parameter generally decreases with increase in temperature and their conductivity behavior is explained by Correlated Barrier Hopping (CBH) model in some studies [39]. Whereas there are also a few studies in which small polaron hopping [40] and quantum mechanical tunneling [41] types of conductivity are reported to take place.…”

Section: Conductivitymentioning

confidence: 99%

Overlapping large polaron tunneling conductivity and giant dielectric constant in Ni0.5Zn0.5Fe1.5Cr0.5O4 nanoparticles (NPs)

Tan

Köseoğlu

Alan

et al. 2011

Journal of Alloys and Compounds

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Section: Conductivitymentioning

confidence: 99%

Overlapping large polaron tunneling conductivity and giant dielectric constant in Ni0.5Zn0.5Fe1.5Cr0.5O4 nanoparticles (NPs)

Tan

Köseoğlu

Alan

et al. 2011

Journal of Alloys and Compounds

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“…The temperature dependence of n is used to explain the mechanism of ac conduction in the ferrite [29,30,20]. In that case where n is temperature independent, quantum mechanical tunneling is expected [31].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

On the structural, magnetic and electrical properties of sol–gel derived nanosized cobalt ferrite

Gopalan

Joy

Al‐Omari

et al. 2009

Journal of Alloys and Compounds

143

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“…The substitution of some trivalent non-magnetic ions such as Ga 3+ in place of Fe 3+ in spinel ferrites will reduce the magnetic moment and alter their magnetic and electrical properties [11,12]. In this re-gard, it was aimed to prepare a spinel oxide system Mg 0.5 Cu 0.5 Ga x Fe 2-x O 4 with 0.0 ≤ x ≤ 0.5 by a ceramic technique and investigate the electrical transport properties, such as electrical conductivity, in the lowfrequency range (10…”

Section: Introductionmentioning

confidence: 99%

Low frequency conductivity study of gallium‐substituted magnesium–copper spinel ferrite

Kaiser

Ata‐Allah

2005

Physica Status Solidi (b)

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Mixed ferrites with the chemical formula Mg 0.5 Cu 0.5 Ga x Fe 2-x O 4 (0.0 ≤ x ≤ 0.5) were prepared by a ceramic route. X-ray diffraction results confirmed the presence of single-phase spinel structure for these samples. Electrical properties of these ferrites at various compositions were investigated from room temperature up to 550 K in the frequency range 10 2 -10 5 Hz. The obtained results revealed semiconductor behavior at high frequency and metallic behavior at low frequency in these materials. All studied compositions exhibit a transition with a change in the slope of the conductivity versus temperature curve. The obtained transition temperature T C is found to decrease linearly with increasing Ga concentration. As Ga substitutes Fe in these compounds the activation energy for electrical conduction in the ferrimagnetic region (E f ) has a small variation with frequency. In contrast, the activation energy in the paramagnetic region (E p ) shows undefined behavior reflecting the nature of this disordered state. The relation of the universal exponent s with temperature gives evidence for the presence of the large overlap polaron (LOP) hopping conduction mechanism in these compounds. The obtained results are explained in the light of the cation -anioncation and cation -cation interactions present over the octahedral B-sites in the spinel structure.

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On the electrical behavior of nickel ferrite-gallates

Cited by 59 publications

References 9 publications

Overlapping large polaron tunneling conductivity and giant dielectric constant in Ni0.5Zn0.5Fe1.5Cr0.5O4 nanoparticles (NPs)

Overlapping large polaron tunneling conductivity and giant dielectric constant in Ni0.5Zn0.5Fe1.5Cr0.5O4 nanoparticles (NPs)

On the structural, magnetic and electrical properties of sol–gel derived nanosized cobalt ferrite

Low frequency conductivity study of gallium‐substituted magnesium–copper spinel ferrite

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