Frequency and temperature dependence of dielectric and electrical properties of TFe 2 O 4 (T = Ni, Zn, Zn 0.5 Ni 0.5 ) ferrite nanocrystals

Mandal, S. K.; Singh, Swati; Dey, P.; Roy, Jitendra Nath; Mandal, Purnendu; Nath, T. K.

doi:10.1016/j.jallcom.2015.10.045

Cited by 91 publications

(21 citation statements)

References 36 publications

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“…The authors related the resistive and capacitive elements to the charge transfer and accumulation, respectively, at the grain boundaries of the materials. The dominating role of the grain boundaries was attributed to the nanometric grain size of the samples . Other authors have used equivalent circuits consisting of a series connection of two R‖C elements to model the charge transfer and accumulation at both, the grain and the grain boundaries of ferrite materials ,.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

et al. 2019

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Spinel ferrites (MFe 2 O 4 , where M is a metal ion) in general, and zinc ferrite (ZnFe 2 O 4 , ZFO) in particular, have recently received considerable attention due to promising results in the field of photocatalysis and, especially, photoelectrochemistry. ZFO exhibits a variable crystal structure in which the distribution of the cations between octahedral and tetrahedral sites in the cubic close-packed oxygen lattice, i. e., the degree of inversion, is known to depend closely on the synthetic conditions. Although the effect on the magnetic and optical properties is well known, fundamental research is still missing to fully understand the impact of the cation distribution on the photoelectrochemical activity. In this context, an utmost important physicochemical property is the electrical conductivity. In this work, the dielectric properties of ZFO samples with degrees of inversion ranging from 0.07 to 0.20 were investigated. The conductivity of the ZFO samples was found to increase as the degree of inversion increases. At an onset value of the degree of inversion between 0.13 and 0.16, the bulk conductivity increases by two orders of magnitude. This increase is a direct evidence of the high impact of the cation arrangement in the crystal lattice on the electronic properties of ZFO.

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Section: Resultsmentioning

confidence: 99%

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

et al. 2019

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“…Filler material comes in different forms; these forms could be in metals, semiconducting oxides, dielectric ceramics, and carbon materials [14]. The study of the complex permittivity and electrical properties of the NiFe2O4, ZnFe2O4, and Zn0.5Ni0.5Fe2O4 nanoparticles was conducted through chemical (pyrophoric reaction) technique [15]. They found that the interfacial polarization in both dielectric and complex impedance studies of those samples can be attributed to predominant interfacial effect due to their nonmetric grain sizes.…”

Section: Advances In Polymer Technologymentioning

confidence: 99%

The Effects of SLS on Structural and Complex Permittivity of SLS-HDPE Composites

Meli

Abbas

Zaid

et al. 2019

Advances in Polymer Technology

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RS-4050 is a rigid epoxy based magnetic castable microwave absorbing material; it has been used in many areas of waveguide application as a microwave waveguide terminations and dummy loads. In recent years, there is a demand for composites material with lower dielectric constant higher loss factor for microwave application. This research, the effect of soda lime silica (SLS) on structural and complex permittivity of soda lime silica-high density polyethylene (SLS-HDPE) composites was conducted in order to explore the possibility of substituting RS-4050 with SLS-HDPE composites as a microwave waveguide terminations and dummy loads. Elemental weight composition of the SLS glass powder and HDPE was identified through scaling of different percentage of SLS and HDPE. X-ray diffraction (XRD) was used to investigate the crystallinity behavior of SLS-HDPE composites. The proposed SLS-HDPE composites material was studied at frequencies 8 to 12 GHz. The study was conducted using waveguide Agilent N5230A PNA technique. The effect of microwave frequency on complex permittivity properties for SLS-HDPE composites of different percentages of SLS and HDPE (10% SLS-90% HDPE, 20% SLS-80% HDPE, 30% SLS-70% HDPE, 40% SLS-60% HDPE, and 50% SLS-50% HDPE) were investigated. Results showed the diffraction patterns reveal good amorphous quality with a genuinely properties structure. The microwave frequency and composites percentages significantly influenced the complex permittivity (real and imaginary) properties of the composites. Moreover, the complex permittivity increased as the percentage of SLS filler increased in the host matrix HDPE as a result of increased in composite density due to less volume being occupied by the filler as the percentage increased. The complex permittivity of the smallest and largest percentages of SLS (10% and 50%) was (2.67-j0.05) and (3.45-j0.35), respectively. The study revealed that the best sample for waveguide application as microwave terminator is 50% SLS as it has the highest dielectric constant, highest loss factor, and highest loss tangent as compared to 10% SLS to 40% SLS. Also 50% SLS has the highest absorption properties as compare to 10% SLS, 20% SLS, 30% SLS, or 40% SLS. The XRD physical structure of the SLS-HDPE composites revealed the absorption characteristics of different percentages of the materials. The SLS-HDPE composites can be applied in the area of waveguide as a microwave waveguide terminations and dummy loads.

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“…With further increase in temperature above 300°C, ε r increases again, particularly at lower frequencies, which may be attributed to dipolar and interfacial polarization . The interfacial polarization is caused primarily by the continuous accumulation of charges at the grain boundaries and leakage current on account of the magnetic phase, which is coincident with tanδ varying with temperature in Fig. (b).…”

Section: Resultsmentioning

confidence: 85%

Crystallization Behavior and Multiferroic Properties of Bi_3.15Nd_0.85Ti₃O₁₂/CoFe₂O₄ Powders Synthesized by Sol–Gel Method

Zhang

Wang

et al. 2016

J. Am. Ceram. Soc.

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Bi 3.15 Nd 0.85 Ti 3 O 12 (BNdT)/CoFe 2 O 4 (CFO) composite ceramic powders with embedded structures were successfully prepared by sol-gel processing. Their crystallization behavior was characterized by XRD, DTA, FT-IR, and HRTEM. The magnetic and ferroelectric phases of these composite ceramic powders segregate during calcination. The CFO phase forms easily at~300°C, thereafter the BNdT matrix phase nucleates with grain growth at the CFO grain boundaries at temperatures >500°C. The CFO phase acts as a heterogeneous nucleation point for formation of the ferroelectric BNdT phase. Furthermore, the 0.5BNdT-0.5CFO composite ceramic powders go through a ferroelectric-paraelectric phase transition at 259°C, and the magnetic CFO nanoparticles (50-100 nm, under calcination at 600°C) embedded in the ferroelectric matrix, show superior magnetic behavior (M max = 16.50 emu/g), comparable to pure CFO nanoparticles.

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Frequency and temperature dependence of dielectric and electrical properties of TFe 2 O 4 (T = Ni, Zn, Zn 0.5 Ni 0.5 ) ferrite nanocrystals

Cited by 91 publications

References 36 publications

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

The Effects of SLS on Structural and Complex Permittivity of SLS-HDPE Composites

Crystallization Behavior and Multiferroic Properties of Bi_3.15Nd_0.85Ti₃O₁₂/CoFe₂O₄ Powders Synthesized by Sol–Gel Method

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Frequency and temperature dependence of dielectric and electrical properties of TFe 2 O 4 (T = Ni, Zn, Zn 0.5 Ni 0.5 ) ferrite nanocrystals

Cited by 91 publications

References 36 publications

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe2O4

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe2O4

The Effects of SLS on Structural and Complex Permittivity of SLS-HDPE Composites

Crystallization Behavior and Multiferroic Properties of Bi3.15Nd0.85Ti3O12/CoFe2O4 Powders Synthesized by Sol–Gel Method

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Product

Resources

About

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe₂O₄

Crystallization Behavior and Multiferroic Properties of Bi_3.15Nd_0.85Ti₃O₁₂/CoFe₂O₄ Powders Synthesized by Sol–Gel Method