Impedance spectroscopy study of Na2Nb4O11 ceramic matrix by the addition of Bi2O3

Oliveira, R. G. M.; Romeu, Mairton Cavalcante; Costa, M. M.; Silva, P. M. O.; Fílho, J. Mendes; Junqueira, Cynthia; Sombra, A. S. B.

doi:10.1016/j.jallcom.2013.08.208

Cited by 17 publications

(7 citation statements)

References 28 publications

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“…Generally, the M′ of the non-porous HAp/ST composites increases with frequency, which is attributed to the conduction phenomena due to the dominance of charge carriers with short-range mobility. It is associated with the insufficiency of restoring force to govern the mobility of charge carriers by exposure to a high-frequency electric field [ 14 , 18 , 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…As can be observed from Figure 3 , M′ and M″ of the porous HAp/ST composites decrease and increase, respectively, when the ST proportion increases from 60 wt% to 90 wt%. As the starch proportion increases, the reduction of the agglomeration effect and the increment of interfacial interaction signify the high ionic conductivity [ 15 , 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…This behaviour may be ascribed to the overall increment of the electrical conduction mechanism and the identical dielectric relaxation process for the non-porous composites. It is associated with the enhancement of hopping/tunneling transport of charge carriers between the localized ions when frequency increases [ 23 , 24 , 25 , 38 ]. The non-porous HAp/ST composites have maximal values for Z′ and Z” at low frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…It remains constant at high frequency. In Figure 5 a, it can also be observed that Z′ with ST proportion ≤ 50 wt% is lower than the porous HAp/ST composites with ST proportion ≥60 wt% due to the abundant charge carriers (enhancement of ac conductivity) from the contribution of HAp content [ 1 , 25 ]. It becomes significant, especially at low frequencies.…”

Section: Resultsmentioning

confidence: 99%

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Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

You

Cheng²,

Tan³

et al. 2023

Polymers

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This study aims to investigate the electric responses (complex modulus and complex impedance analysis) of hydroxyapatite/starch bone scaffold as a function of hydroxyapatite/starch proportion and the microstructural features. Hence, the non-porous and porous hydroxyapatite/starch composites were fabricated with various hydroxyapatite/starch proportions (70/30, 60/40, 50/50, 40/60, 30/70, 20/80, and 10/90 wt/wt%). Microstructural analysis of the porous hydroxyapatite/starch composites was carried out by using scanning electron microscopy. It shows that the formation of hierarchical porous microstructures with high porosity is more significant at a high starch proportion. The complex modulus and complex impedance analysis were conducted to investigate the electrical conduction mechanism of the hydroxyapatite/starch composites via dielectric spectroscopy within a frequency range from 5 MHz to 12 GHz. The electrical responses of the hydroxyapatite/starch composites are highly dependent on the frequency, material proportion, and microstructures. High starch proportion and highly porous hierarchical microstructures enhance the electrical responses of the hydroxyapatite/starch composite. The material proportion and microstructure features of the hydroxyapatite/starch composites can be indirectly reflected by the simulated electrical parameters of the equivalent electrical circuit models.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

You

Cheng²,

Tan³

et al. 2023

Polymers

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“…In this paper, experimental measurements, numerical simulations and analysis of the characteristic of microwave NN ceramic matrix was conducted with additions of 0%, 2%, 5% and 10% Bi 2 O 3 . On the other hand, working on advanced materials involve a complex fabrication process that takes a certain time for selecting an adequate material among all possibilities available in nature .…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of Na₂Nb₄O₁₁ dielectric resonator antenna added with Bi₂O₃ for microwave applications

Oliveira¹,

Freitas²,

Romeu³

et al. 2016

Micro & Optical Tech Letters

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In this paper is reported an experimental and numerical investigation of the microwave dielectric properties of Na2Nb4O11 (NN), ceramic matrix added with (0, 2, 5, and 10 wt%) of Bi2O3, obtained through a new procedure based on the solid‐state method. The experimental and theoretical characteristics of the resonator like return loss, bandwidth, input impedance are in good agreement. The simulations of radiation patterns are presented. For NN reference sample, frequency response bandwidth is of 43MHz (simulated) and 35MHz (experimental) for frequency operation around 2.28 GHz. The NN reference sample showed a dielectric permittivity around 58.4, with loss around 7.3 × 10− 3. The adding of bismuth oxide (2 and 5 wt%) reduced the value of the dielectric permittivity, otherwise the adding of 10 wt% increases its value. The temperature coefficient of resonant frequency (τf) was also measured for all dielectric samples. The values obtained were in the range of −3378 to −250ppm/°C. The results obtained confirm the necessity of producing composites of this material with others positive τf materials for obtaining dielectric resonator antennas with τf = 0. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1211–1217, 2016

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Investigation of Charge Transfer Mechanism and Dielectric Relaxation in CsCdCl₃ Perovskite

Chakchouk,

Almalawi,

Smaili

et al. 2024

Applied Organom Chemis

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The exceptional optoelectronic capabilities of all‐inorganic metal halide perovskite semiconductor components open up a multitude of possible applications. Among all the metal halides, the chloride of cesium cadmium has not been investigated in great detail. Here, we describe a straightforward method for creating CsCdCl3 perovskite single crystals using the slow evaporation solution growth approach. These were investigated by utilizing X‐ray powder diffraction, and optical and impedance spectroscopies. The creation of a single‐phase with a hexagonal‐type structure was verified by the X‐ray powder diffraction (XRPD) data. The compound's semiconductor characteristics were verified by the optical measurement, indicating a direct band‐gap value of about 3.16 eV. The absorption and reflectance spectrum was also used to calculate and explain the optical extinction coefficient, Urbach energy, and skin depth as functions of the input photon's wavelength. Besides, the impedance spectroscopy technique was employed to investigate the characteristics of this component, across a frequency range of 10−1 Hz to 106 Hz and at temperatures ranging from 313 K to 453 K. The frequency behavior of the AC conductivity, σac, was analyzed using the universal Jonscher law. The outcomes of the charge transport investigation on CsCdCl3 imply that the perovskite material possessed a quantum mechanical tunneling (QMT) model for T < 363 K and a large polaron tunneling (OLPT) paradigm for T > 363 K. A correlation between the ionic conductivity and the crystal structure was established and discussed. Ultimately, the low dielectric loss and high dielectric constant of CsCdCl3 make it a promising material for energy harvesting devices.

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Impedance spectroscopy study of Na2Nb4O11 ceramic matrix by the addition of Bi2O3

Cited by 17 publications

References 28 publications

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

Design and simulation of Na₂Nb₄O₁₁ dielectric resonator antenna added with Bi₂O₃ for microwave applications

Investigation of Charge Transfer Mechanism and Dielectric Relaxation in CsCdCl₃ Perovskite

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Impedance spectroscopy study of Na2Nb4O11 ceramic matrix by the addition of Bi2O3

Cited by 17 publications

References 28 publications

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

Design and simulation of Na2Nb4O11 dielectric resonator antenna added with Bi2O3 for microwave applications

Investigation of Charge Transfer Mechanism and Dielectric Relaxation in CsCdCl3 Perovskite

Contact Info

Product

Resources

About

Design and simulation of Na₂Nb₄O₁₁ dielectric resonator antenna added with Bi₂O₃ for microwave applications

Investigation of Charge Transfer Mechanism and Dielectric Relaxation in CsCdCl₃ Perovskite