Electrical and Dielectric Properties of Yttrium–Iron Ferrite Garnet Polycrystals Grown by the Radiation–Thermal Sintering Technology

Костишин, В. Г.; Shakirzyanov, R. I.; Nalogin, A. G.; Щербаков, С. В.; Isaev, I. M.; Nemirovich, M. A.; Михайленко, М. А.; Korobeinikov, M. V.; Mezentseva, M. P.; Салогуб, Д. В.

doi:10.1134/s1063783421030094

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…Generally, the dielectric properties of ceramics depend on electronic polarization, ionic polarization, relaxation, and resonance. Low-frequency relaxation in oxide ceramics with transition elements or ions of different valences can occur in accordance with Koop's theory, which considers ceramic to be a nonhomogeneous medium with intergranular boundaries and crystalline grains with different dielectric properties [17,41]. In such a medium, there is a possibility of the Maxwell-Wagner polarization mechanism occurring between poorly conducting intergranular interfaces and well-conducting crystalline grains.…”

Section: Resultsmentioning

confidence: 59%

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Structural, Dielectric, and Mechanical Properties of High-Content Cubic Zirconia Ceramics Obtained via Solid-State Synthesis

Giniyatova,

Kozlovskiy,

Shakirzyanov

et al. 2023

Applied Sciences

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In this work, the structural, electrical, and mechanical properties and phase composition of high-content cubic zirconium oxide ceramics stabilized with Ca were investigated. The novelty of this work lies in evaluating the potential use of porous ceramics obtained using calcium carbonate as a matrix for dispersed nuclear fuel. Experimental samples were prepared using solid-phase synthesis through sintering in air at 1500 °C. The X-ray diffraction method and Raman spectroscopy showed that the fraction of the cubic zirconium oxide ZrO2-c phase gradually increased as the mass concentration changed from Cw = 0.00 to Cw = 0.15, and the CaZrO3 phase was present at concentrations of Cw = 0.20 and Cw = 0.25. When the phase composition was altered, significant changes occurred in the internal microstructure of the ceramics due to the processes of grain sintering and pore formation. Quantitative XRD analysis demonstrated the incorporation of Ca into the cubic structure of the ZrO2-c polymorph. Dielectric spectroscopy at low frequencies revealed that the synthesized ceramics had a dielectric constant of 16.8–22 with a low dielectric loss of ~ 0.005. The microhardness value at a load of 200 kgf (HV0.2) of the obtained samples varied between 5 and 12 GPa and depended on the internal microstructure and phase composition. The obtained results clearly indicate that the mechanical and electrical properties and phase composition of synthesized ceramics make them suitable as a matrix for dispersed nuclear fuels.

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Section: Resultsmentioning

confidence: 59%

“…As is known, the most widespread method of producing functional ceramics is solidphase synthesis using oxides, which includes co-milling of the initial reagents, pressing, and sintering [17,18]. However, other reagents, such as carbonates, are often used in ceramic technology to control shrinkage and pore formation [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Structural, Dielectric, and Mechanical Properties of High-Content Cubic Zirconia Ceramics Obtained via Solid-State Synthesis

Giniyatova,

Kozlovskiy,

Shakirzyanov

et al. 2023

Applied Sciences

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“…The complex structure of ceramic ferrite is conducive to the formation of space charges between high-resistance grain boundaries and low-resistance grains. Owing to hopping conductivity in ferrites between Me 2+ and Me 3+ ions (sites A and B), electrons or holes accumulate at the interfaces between grains and grain boundaries and form space charges [20,21]. Maxwell−Wagner relaxation is observed in this context at low frequencies (below several MHz).…”

Section: Resultsmentioning

confidence: 99%

Radar absorbing properties of polyvinyl alcohol/Ni-Znferrite-spinel composite

et al. 2022

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The electromagnetic and radio-absorbing characteristics offerrite-polymer composites with conductive inclusions based on polyvinylalcohol are investigated. The Ni-Zn spinel ferrite powder of 2000NN gradewith composition Ni0.32Zn0.68Fe2O4 was used as filler. It is shown that theobtained composites are effective absorbers in the frequency range of 2-5 GHz with peak reflection loss less than ~20 dB. Through the analysis of thepermittivity spectra and permeability spectra, as well as the calculatedreflection loss spectra, critical factors of the electromagnetic waveabsorption in obtained composites are established. Keywords: polymer composite, radio absorption, nickel-zinc ferrite,polyvinyl alcohol\

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“…This feature can be explained by the relatively high conductivity of ceramics [3]. If a metal oxide consists of multivalence cations, its conductivity becomes higher due to the hopping electron mechanism [31]. Because of the high conduction, the dielectric losses increased, similar to joule losses in conductors.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the Phase Composition, Structural, Mechanical, and Dielectric Properties of (1 − x)∙ZrO2-x∙CeO2 Ceramics Synthesized by the Solid-State Method

Giniyatova,

Shakirzyanov,

Garanin

et al. 2024

Applied Sciences

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Ceramics based on zirconium dioxide are very important compounds for dental, implant, and structural material applications. Despite the fact that tetragonally stabilized YSZ has been well studied, the search for new compositions of zirconia-based ceramics is still in progress. The ZrO2-CeO2 system is one of the alternatives for YSZ materials, but there is conflicting experimental data on its phase composition and mechanical properties depending on the ratio of components. In this study, we investigated the phase composition, and microstructural, mechanical, and physical properties of (1 − x)∙ZrO2-x∙CeO2 (step of x = 0.05) ceramics obtained by the solid-state sintering process from micron-sized powders. For the characterization of samples, XRD, Raman spectroscopy, SEM, the Vickers Microhardness Test, and dielectric spectroscopy were implemented. The results showed that by varying the CeO2 concentration, it is possible to synthesize stable tetragonal ZrO2 at room temperature with a high microhardness HV0.05 value of ~1500, low porosity (~2.5%), and a high dielectric constant of 36. The pronounced combined effect of tetragonal phase formation, densification, and grain size reduction on the mechanical and dielectric properties of the experimental samples was investigated. Refined experimental data make it possible to synthesize high-quality zirconia–ceria ceramics for use as refractories, dispersed nuclear fuel, or solid oxide fuel cells.

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Electrical and Dielectric Properties of Yttrium–Iron Ferrite Garnet Polycrystals Grown by the Radiation–Thermal Sintering Technology

Cited by 10 publications

References 9 publications

Structural, Dielectric, and Mechanical Properties of High-Content Cubic Zirconia Ceramics Obtained via Solid-State Synthesis

Structural, Dielectric, and Mechanical Properties of High-Content Cubic Zirconia Ceramics Obtained via Solid-State Synthesis

Radar absorbing properties of polyvinyl alcohol/Ni-Znferrite-spinel composite

Investigation of the Phase Composition, Structural, Mechanical, and Dielectric Properties of (1 − x)∙ZrO2-x∙CeO2 Ceramics Synthesized by the Solid-State Method

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