Structural and dielectric properties of undoped ZnO pellets prepared by solid state route

Chaari, Mariem; Matoussi, Adel

doi:10.1007/s00339-013-8199-9

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…Therefore, we have found that the sample doped with 3 wt% of TiO 2 content has the lowest value of resistivity, thus, less grain boundary. M. Chaari et al have fabricated zinc oxide ceramics sintered at various temperatures (700°C‐1000°C) by solid‐state route. They found that the pellet sintered at 900°C has the lowest value of resistivity, hence, less grain boundary.…”

Section: Resultsmentioning

confidence: 99%

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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ZnO/TiO2 composite ceramics have been prepared by solid‐state reaction technique at 900°C. The X‐ray diffraction results revealed the formation of secondary phases referred to as spinel Zn2TiO4 and hexagonal ZnTiO3. The structural analysis showed that all the composites that have been prepared have a polycrystalline nature and a hexagonal wurtzite structure. The complex modulus (M) and electric impedance of the samples have been investigated by broadband dielectric spectroscopy in a wide range of temperature (40°C‐110°C) and frequency (0.1 Hz to 10 MHz). The modulus plots (M′′, M′) illustrate the presence of non‐Debye type of relaxations attributed to the effects of interfacial and dipolar polarizations. The real and the imaginary parts of the impedance are well fitted to equivalent circuit models. At high temperatures, Z″max varies from 0.03 × 106 to 4.9 × 106 Ω when the TiO2 doping concentration increases from 1 to 7 wt%. From the obtained results, the secondary phase ZnTiO3 plays an important role in the electrical properties.

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Section: Resultsmentioning

confidence: 99%

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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“…Moreover, the enhancement of dielectric polarization typically at low frequencies is due to the hopping of electrons/ holes and is known as interfacial polarization or the Maxwell-Wagner-Sillars (MWS) effect. [36][37][38][39][40] At higher frequencies the dipoles lag behind the applied electric eld, thus they did not have adequate time to polarize, which resulted in steady decrease in dielectric permittivity. The orientational polarization at higher frequencies did not evidence any dielectric dispersion and attained a constant dielectric permittivity.…”

Section: Dielectric Analysismentioning

confidence: 99%

“…The existence of orientational polarization is due to the vacancies (O 2À ) and interstitials (Zn 2+ ) in the heterostructures. [38][39][40] It can be noted in the ZBT and ZCBT heterostructures, a difference in the dielectric permittivity was observed at lower frequencies (<1 kHz). The ZBT heterostructures exhibited proportionate increase in dielectric permittivity with addition of pure BaTiO 3 .…”

Section: Dielectric Analysismentioning

confidence: 99%

Schottky barrier tuning in semiconducting ZnO and BaTiO₃ hybrid heterostructures shows dielectric and electrical anisotropy

2016

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“…The pallets were compressed under a force of 50KN for 5 min to solidify them. Subsequently, they were sintered at 900 °C for 5 h, with a temperature increment rate of 5 °C per minute 66 . Sintering is a heat treatment process used to fuse the particles together and increase the density and strength of the ZnO pallets.…”

Section: Methodsmentioning

confidence: 99%

Colloidal stability and dielectric behavior of eco-friendly synthesized zinc oxide nanostructures from Moringa seeds

José,

Shinde

2024

Sci Rep

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This study centers on the environmentally benign synthesis of zinc oxide nanoparticles (ZnO NPs) derived from Zn (CH3COO)2·2H2O and Moringa seeds. The synthesized nanostructures underwent comprehensive characterization utilizing diverse analytical techniques, encompassing X-ray diffraction (XRD), UV–VIS spectroscopy, field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. XRD measurements coupled with W–H plot transformation unequivocally confirmed the formation of ZnO nanostructures, characterized by an average size of 24.9 nm. UV–VIS spectroscopy, complemented by Kubelka Munk curve analysis, elucidated the direct conduction and determined a bandgap of 3.265 eV. FESEM analysis revealed minimal particle aggregation, showcasing well-defined grain boundaries spanning sizes from 20.4 to 87.7 nm. XPS analysis substantiated the presence of Zn (2p), Zn (3p), Zn (3d), and O (1s). Raman spectroscopy identified E2H as the predominant mode, followed by E1(TO) and (E2H-E2L). ZnO thin films, fabricated via pulsed laser deposition (PLD) and deposited onto silicon (100) substrates, exhibited exemplary morphology and discernible topography, characterized by a normal grain size distribution. Zeta potential tests yielded a value of approximately ($$\mathcalligra{z}$$ z ~ − 43.8 mV), indicative of the commendable stability of the colloidal suspension, likely attributable to low particle aggregation. Dielectric measurements conducted on sintered pellets at 900 °C unveiled elevated capacitance and dielectric constant at low frequencies across the temperature range of 289.935–310 K. These findings affirm the potential utility of environmentally synthesized ZnO for a spectrum of applications, including energy devices and nanofluids.

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Structural and dielectric properties of undoped ZnO pellets prepared by solid state route

Cited by 14 publications

References 42 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Schottky barrier tuning in semiconducting ZnO and BaTiO₃ hybrid heterostructures shows dielectric and electrical anisotropy

Colloidal stability and dielectric behavior of eco-friendly synthesized zinc oxide nanostructures from Moringa seeds

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Structural and dielectric properties of undoped ZnO pellets prepared by solid state route

Cited by 14 publications

References 42 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Schottky barrier tuning in semiconducting ZnO and BaTiO3 hybrid heterostructures shows dielectric and electrical anisotropy

Colloidal stability and dielectric behavior of eco-friendly synthesized zinc oxide nanostructures from Moringa seeds

Contact Info

Product

Resources

About

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Schottky barrier tuning in semiconducting ZnO and BaTiO₃ hybrid heterostructures shows dielectric and electrical anisotropy