Magneto-dielectric properties of in-situ oxidized magnesium-aluminium spinel thin films using electrodeposition

Nazli, Hina; Anjum, Rabbiya; Iqbal, Fatima; Awan, Attia; Riaz, Saira; Kayani, Zohra Nazir; Naseem, Shahzad

doi:10.1016/j.ceramint.2019.12.091

Cited by 13 publications

(2 citation statements)

References 32 publications

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“…For example, CoFe 2 O 4 thin film materials were reported to have a value of dielectric permittivity that varies from ε = 117 to about ε = 100 at frequencies between 20 Hz and 1 MHz [ 37 ]. Bellino and colleagues reported values of the dielectric constant for MgFe 2 O 4 thin films, which decreased from ε = 140 to ε = 1 when the measuring frequency increased from ν = 20 Hz to ν = 2 MHz, respectively [ 33 ], whereas others reported values below ε = 14 for MgAl 2 O 4 [ 38 ], NiFe 2-x Cr x O 4 [ 39 ], Mg 0.6 Cu 0.2 Ni 0.2 Cr 2 O 4 [ 39 ], and CoFe 2 O 4 thin films [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Dielectric ZnCr2O4 Nanopowders and Thin Films for Parallel-Plate Capacitor Applications

Mykhailovych,

Caruntu,

Graur

et al. 2023

Micromachines

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We report here the successful shape-controlled synthesis of dielectric spinel-type ZnCr2O4 nanoparticles by using a simple sol-gel auto-combustion method followed by successive heat treatment steps of the resulting powders at temperatures from 500 to 900 °C and from 5 to 11 h, in air. A systematic study of the dependence of the morphology of the nanoparticles on the annealing time and temperature was performed by using field effect scanning electron microscopy (FE-SEM), powder X-ray diffraction (PXRD) and structure refinement by the Rietveld method, dynamic lattice analysis and broadband dielectric spectrometry, respectively. It was observed for the first time that when the aerobic post-synthesis heat treatment temperature increases progressively from 500 to 900 °C, the ZnCr2O4 nanoparticles: (i) increase in size from 10 to 350 nm and (ii) develop well-defined facets, changing their shape from shapeless to truncated octahedrons and eventually pseudo-octahedra. The samples were found to exhibit high dielectric constant values and low dielectric losses with the best dielectric performance characteristics displayed by the 350 nm pseudo-octahedral nanoparticles whose permittivity reaches a value of ε = 1500 and a dielectric loss tan δ = 5 × 10−4 at a frequency of 1 Hz. Nanoparticulate ZnCr2O4-based thin films with a thickness varying from 0.5 to 2 μm were fabricated by the drop-casting method and subsequently incorporated into planar capacitors whose dielectric performance was characterized. This study undoubtedly shows that the dielectric properties of nanostructured zinc chromite powders can be engineered by the rational control of their morphology upon the variation of the post-synthesis heat treatment process.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Dielectric ZnCr2O4 Nanopowders and Thin Films for Parallel-Plate Capacitor Applications

Mykhailovych,

Caruntu,

Graur

et al. 2023

Micromachines

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“…At higher frequencies, it was discovered that substance dispersion response was independent of the external field [28]. The dielectric nature of any substance that was dependent especially on the composition of the substance was linked to the origin of conduction and polarization phenomena like electronic or atomic polarization, orientation or dipolar polarization, space charge, ionic polarization and interfacial polarization [84][85][86]. With respect to Koop's phenomenological theory as well as Maxwell-Wagner's two-layered concept of interfacial polarization, the dielectric pattern of thin films was based on grain boundaries and grains [38].…”

mentioning

confidence: 99%

Probing the impact of Ba on properties of ZnO at the nanoscale: optical, dielectric and antibacterial activity evolution

Kayani,

Farid,

Bashir

et al. 2024

Phys. Scr.

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The sol-gel dip coating technique was used to manufacture undoped and Barium doped zinc oxide thin films. Doping is extensively used to refine semiconductor properties. Without and with varying ratios of Ba 1-9 wt.% dopant, ZnO thin films have been manufactured. The effect of Ba on the dielectric, structural, antibacterial, optical and morphological characteristics of ZnO was investigated. The optical properties demonstrate that the bandgap of the pure ZnO thin film is higher than that of Ba-doped ZnO films, which is beneficial for improving solar cell performance. According to the XRD data, all films of ZnO have hexagonal wurtzite structures According to XRD structural analysis; the incorporation of Ba lowers the crystallinity of ZnO thin films by reducing the crystallite size. The Ba doping changes the surface roughness and morphology. The hopping process defines the dielectric characteristics that follow Koop’s theory as well as the Maxwell-Wagner model. A lower dielectric constant makes it ideal for high-frequency devices. These films exhibit ferromagnetism. Barium-doped zinc oxide photocatalyst could successfully decompose methylene blue dye by making it suitable for wastewater treatment.Ba doping effectively kills both gram-negative and gram-positive bacteria. They have antimicrobial applications in the food industry and biomedicine.

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Effect of Au ions on structural, optical, magnetic, dielectric, and antibacterial properties of TiO2 dip-coated thin films

Hassan

Kayani

Anwar

2021

J Mater Sci: Mater Electron

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Magneto-dielectric properties of in-situ oxidized magnesium-aluminium spinel thin films using electrodeposition

Cited by 13 publications

References 32 publications

Fabrication and Characterization of Dielectric ZnCr2O4 Nanopowders and Thin Films for Parallel-Plate Capacitor Applications

Fabrication and Characterization of Dielectric ZnCr2O4 Nanopowders and Thin Films for Parallel-Plate Capacitor Applications

Probing the impact of Ba on properties of ZnO at the nanoscale: optical, dielectric and antibacterial activity evolution

Effect of Au ions on structural, optical, magnetic, dielectric, and antibacterial properties of TiO2 dip-coated thin films

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