Lead telluride nanocrystalline thin films: Structure, optical characterization and a broadband dielectric spectroscopy study

Mahdy, Manal A.; Zawawi, I. K. El; Turky, Gamal

doi:10.1016/j.cap.2019.04.011

Cited by 24 publications

(8 citation statements)

References 35 publications

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“…This interfacial polarization can be explained according to Maxwell-Wagner-Siller (MWS-type) polarization that is usually found in the heterogeneous medium. The considered medium here contains conducting grains separated by grain boundaries of lower electrical conductivity just like a net of micro-capacitors [51,52,56,57]. These bending is remarkably shifted towards higher frequencies (became faster) as the temperature increased b Fig.…”

Section: Dielectric and Electrical Investigationsmentioning

confidence: 98%

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Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Ibrahim

Abo-Mosallam

Mahdy

et al. 2022

J Mater Sci: Mater Electron

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Glasses with the composition (11.5 − ×) CaO − 23.5Li2O − 65SiO2: × NiO mol. % (0 $$\le \times \leq$$ ≤ × ≤ 11.5) were synthesized by melt-quenching method. And a number of physical parameters have been established. The refractive index and energy gap were also used to estimate the metallization criterion, where these glasses have shown values fallings between high (insulators) and low (metals), indicating that they are semiconductors. The XRD pattern shows the amorphous nature of investigated glasses. A number of spectroscopic analyses of the studied glasses were performed, in relation to NiO content, including Fourier transform infrared (FTIR) and UV–Visible diffuse reflectance spectroscopy (DRS). Due to compositional changes, FTIR measurements have revealed structural changes in the glass network. Furthermore, with increasing NiO content, the asymmetrical bands of silicate units increase. The creation of Ni–O–Si bonds in the silicate matrix has been attributed to the introducing heavier Ni+2 as [NiO4]2− tetrahedral species in substitution of the lighter silicon ion in the [SiO4]4− network, but it could also operate as a network modifier in glass materials. The Ni2+ ion may have behaved as a network intermediary, causing more compact structure. The mechanism of charge transfer in the glass compositions under investigation is studied using broadband dielectric spectroscopy. For the first time, the relationship between the hopping time of free ions and dc conductivity is illustrated. All of the glasses under investigation have the same charge transport mechanism. The results suggest the semiconducting nature of these glasses.

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Section: Dielectric and Electrical Investigationsmentioning

confidence: 98%

“…iM'' are determined and interpreted according to their interrelationships as detailed in Refs. [50][51][52][53]. The frequency dependence of the parameters: e, tan d, M 00 , and r 0 will be considered here.…”

Section: Dielectric and Electrical Investigationsmentioning

confidence: 99%

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Ibrahim

Abo-Mosallam

Mahdy

et al. 2022

J Mater Sci: Mater Electron

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“…This generates a potential barrier, and therefore, the charge carriers accumulate at the grain boundary. The space charge polarization can be explained by Maxwell-Wagner-Siller (MWS-type) polarization processes usually found in inhomogeneous medium containing of conducting grains separated by grain boundaries of high electrical resistivity [49][50][51][52]. At the region of high-frequency, the space charge polarization consequence is decreased, and the hopping rate of charge carriers lags behind that of the applied electric field.…”

Section: Dielectric and Electrical Investigationsmentioning

confidence: 99%

Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Abouhaswa

Badr

Nasr

et al. 2021

J Inorg Organomet Polym

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Fe 2 Cd 1-x Mn x O 4 (x= 0, 0.25, 0.5, 0.75, 1) spinel ferrite nanoparticle samples were synthesized using a flash auto-combustion technique and analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). The inspection of dielectric and magnetic properties of the prepared ferrites was carried out by using broadband dielectric spectroscopy (BDS) and vibration sample magnetometer (VSM) measurements, respectively. Xray diffraction analysis verified the formation of the main cubic phase with space group Fd3m and a decrease in lattice constants with the increase in Mn-content.FTIR study revealed the two characteristic absorption bands of spinel ferrites and their dependence on Mn-content was investigated and explained. Elastic moduli such as Longitudinal, transverse and mean elastic wave velocities (𝑉 𝑙 , 𝑉 𝑡 𝑉 𝑚 ), bulk modulus (𝐵), rigidity modulus (𝐺), Young modulus (𝐸) and calculated Debye temperature ( D ) have been studied and found to decrease with the increase in Mncontent. SEM analysis revealed nanoparticles agglomeration of uniform grains with increasing in the average grain size as Mn-content increased. The VSM measurements showed an increase in saturation magnetization (M s ) accompanied by a decrease in coercivity (H c ) as Mn-content increased. Dielectric investigations showed very high values of permittivity and dielectric loss at lower frequencies reflecting the combination of exchange of electrons between ferrous and ferric ions and ions' transport. The ac-conductivity showed a plateau that yields the dcconductivity (σ dc ) at lower frequencies followed by a characteristic frequency (ν c ) at which it tends out to follow a power law. The relation between these two parameters confirms the empirical BNN-relation.

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“…The representation of the imaginary part of electric modulus is usually used in the dielectric characterization because it suppresses undesirable capacitance effects due to electrode contacts and provides a clear view of the DC conduction and dipole relaxation. [32][33][34][35][36] The AC conductivity follows the power law at higher frequencies for the samples under consideration. As frequency decreases, the onset of the AC conductivity effect sets in at frequency = f c , leading to pronounced distortions of the measured dielectric response.…”

Section: Resultsmentioning

confidence: 99%

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Turky

Hamzawy

Bassyouny

et al. 2021

ECS J. Solid State Sci. Technol.

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Synthesis and characterization of biocomposite materials of hydroxyapatite (HA) and yttrium oxide (Y2O3) were investigated. HA nanoparticles powder was obtained from mussel shells via a wet chemical precipitation routine. HA powder was doped with 1 and 2 wt% of Y2O3 . For microstructural examination, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) coupled with energy dispersive X-rays (EDX) were used. In addition, the dielectric and electrical properties and antimicrobial activities were investigated. XRD patterns reveal the crystallization of the oxyapatite. The peak intensities of pristine HA are inferior compared to the yttrium containing HA composites, thus suggesting that the addition of yttrium promotes the crystallization of HA due to the variance in their ionic radii. FT-IR shows a variation in the phosphate wavenumber, indicating the integration of yttrium into the HA matrix. SEM reveals nanorod- or worm-like crystals arose in clusters. With increasing Y2O3, from 1 to 2 wt%, the DC conductivity reduces from 16 to 9.3 nS/cm, which confirms that high amounts of Y3+ substitute Ca2+ in the HA matrix. In the high-frequency range, the AC conductivity linearly increases with increasing frequency following the universal power law. Further, antimicrobial activity results showed that the addition of yttrium in HA improves the antimicrobial effects against pathogenic bacteria and fungi. Additional research is needed to investigate the doping concentration of yttrium ions, and an anticipated property could be comprehended for several forthcoming biomedical applications

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Lead telluride nanocrystalline thin films: Structure, optical characterization and a broadband dielectric spectroscopy study

Cited by 24 publications

References 35 publications

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Impact of high NiO content on the structural, optical, and dielectric properties of calcium lithium silicate glasses

Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

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