Self-glazing dielectric ceramic bodies fabricated from Egyptian rhyodacite and kaolin

El-Mehalawy, N.; Awaad, M.; Turky, Gamal; Ali‐Bik, Mohamed W.; Rahim, Said H. Abd El; Naga, S. M.

doi:10.1016/j.matchemphys.2021.124785

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The less frequency dependence at higher frequencies (⩾ 100 kHz) reflects clearly the lag of the hopping time and/or the alteration of the polarization behind the frequency of the applied electric field. [63][64][65][66][67] AC-conductivity.-Figure 10 depicts the variation in the real part of complex conductivity, σ′, as a function of frequency in the range of 0.1 Hz to 20 MHz at two selected temperatures namely, 303 and 423 K. The two selected temperatures were chosen just as representative examples. Although the base (LGFO) shows a perfect insulator compounds its σ′ decreases gradually or even linearly with frequency and its conductivity has a values in the order of sub-PicoSiemens (≈10 −13 ) per cm at lower limit of the frequency window (0.1 Hz), it behaves like many other conductive glasses, ionconducting glass-forming liquids and conductive polymers for the MCFO doped compositions.…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Moustafa

Gad²,

Turky

et al. 2022

ECS J. Solid State Sci. Technol.

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Multiferroic composite materials with the nominal composition (La0.8Gd0.2FeO3)1-x(Mn0.5Cu0.5Fe2O4)x, x=0.0≤x≤1 were prepared using the co-precipition method. XRD, FTIR, and Raman were utilized to investigate the structure phase, microstructural characteristics, and vibrational bands. The optical properties were analyzed and the VSM was used to investigate the magnetic properties of the composites. Broadband dielectric spectroscopy was employed to investigate the dielectric and electrical performance of the prepared multiferroic composites. Rietveld refinement of the XRD patterns confirmed the orthorhombic phase for lanthanum gadolinium iron oxide (La0.8Gd0.2FeO3) and cubic phase for manganese copper ferrite (Mn0.5Cu0.5Fe2O4). The crystallite size of LGFO phase pointed out that it increases with increasing the MCFO phase, while the microstrain found to decline. The FTIR results elucidated the tetrahedral and octahedral bands. The deduced optical properties revealed that the samples have optical energy gap in the range 4.18 -4.5 eV. The magnetic properties revealed that the composites exhibit typical ferromagnetic hysteresis loops, indicating the presence of ordered magnetic structure. The frequency dependence of permittivity (f) and real part of complex conductivity, (f) exhibits a development of a net of micro-capacitors like behavior that stores charge carriers.

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Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Moustafa

Gad²,

Turky

et al. 2022

ECS J. Solid State Sci. Technol.

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“…The lower influence of composition, frequency, and temperature on the permittivity at higher frequencies is now a prominent feature in condensed matter physics. It is attributed to the lag of alteration of any dynamic fluctuation behind this higher frequency of the applied electric field [34][35][36][37]. However, ε′ increases slightly with decreasing frequency in the case of the two nanocomposites.…”

Section: Dielectric Spectroscopy Investigationsmentioning

confidence: 93%

Comparative study of CdS&TiO₂ based polyaniline/polyvinyl alcohol nanocomposites as electrode for supercapacitors

Maged¹,

Shawkey²,

Rayan³

et al. 2022

Phys. Scr.

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The researchers used the oxidative chemical polymerization of aniline to prepare the polyaniline/polyvinyl alcohol (PANI/PVA) blend and its nanocomposites loaded with cadmium sulfide and Titanium dioxide nanoparticles (CdS-NPs & TiO2-NPs) were synthesized by aniline oxidative chemical polymerization. CdS and TiO2 were incorporated into the prepared nanocomposite to reinforce the mechanical and electrical energy storage performance. XRD revealed the presence of CdS NPs & TiO2 NPs in the polymer matrix; meanwhile, SEM confirms they are well dispersion in the polymer matrix and are dispersed well on the superficies of the synthesized nanocomposites. The presence of characteristic peaks in the Fourier transforms infrared proved the compatibility of the investigated nanocomposite. The analysis of the cyclic voltammetry, CV, confirms the possibility of using the synthesized nanocomposites as a supercapacitor electrode in a 2 M KOH electrolyte. A broadband dielectric spectroscopy was used to examine the electrical and dielectric properties of the prepared samples over a broad range of frequencies and at four selected temperatures. Therefore, this study is devoted to shedding more light on the blend's performance and nanocomposites under investigation as an electrode or even solid electrolyte in superconductor technology. The study shows that the blend behaves similarly to its two nanocomposites in the activation plot. However, the blend has higher dc-conductivity by about four orders of magnitude, an electrode polarization is developed accompanied by apparently colossal of the  values. This makes it very promising for applications in many fields of advanced microelectronics.

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Characterization of Soil from Areas Degraded by Mining Activity in Campos Dos Goytacazes-RJ, Brazil

Azevedo¹,

Brainer²,

Marvila³

et al. 2022

Characterization of Minerals, Metals, and Materials 2022

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Self-glazing dielectric ceramic bodies fabricated from Egyptian rhyodacite and kaolin

Cited by 8 publications

References 25 publications

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Comparative study of CdS&TiO₂ based polyaniline/polyvinyl alcohol nanocomposites as electrode for supercapacitors

Characterization of Soil from Areas Degraded by Mining Activity in Campos Dos Goytacazes-RJ, Brazil

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Self-glazing dielectric ceramic bodies fabricated from Egyptian rhyodacite and kaolin

Cited by 8 publications

References 25 publications

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach

Comparative study of CdS&TiO2 based polyaniline/polyvinyl alcohol nanocomposites as electrode for supercapacitors

Characterization of Soil from Areas Degraded by Mining Activity in Campos Dos Goytacazes-RJ, Brazil

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Comparative study of CdS&TiO₂ based polyaniline/polyvinyl alcohol nanocomposites as electrode for supercapacitors