N.S. Abd El-Aal

National Institute of Standards

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Structure and Ultrasonic Properties of Vanadium Tellurite Glasses ContainingCopper Oxide

Archives of Acoustics (2009)

N.S. Abd El-Aal H. Afifi

The elastic properties of vanadium tellurite glasses, 65TeO2-(35-x)V2O5-xCuO, with different compositions of Copper (x=7.5 to 17.5mol% in steps of 2.5mol%) have been studied at room temperature (300K). The ultrasonic velocity measurements have been made, using a transducer having resonating frequency of 4MHz (both longitudinal and shear). The density, molar volume, and ultrasonic velocities show interesting features, which are used to explore the structural changes in the network. Elastic moduli, Poisson ratio, crosslink density, Microhardnes, and Debye temperature of the glasses have been determined using the experimental data. The composition dependence of the elastic properties explores useful information about the physical properties of the vanadium tellurite glasses doped with Copper. Quantitative analysis has been carried out in order to obtain more information about the structure of the glass under the study, based on bond compression model and the Makishima [ampersand] Mackenzie model. The observed results through ultrasonic non-destructive evaluation, investigate the structural changes and mechanical properties of the glass.

Debye model

Poisson's ratio

Source

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Citations (17)

Interpretation of mechanical properties and structure of TeO2–Li2O–B2O3 glasses

Physica B Condensed Matter (2007)

Yasser B. Saddeek H. Afifi N.S. Abd El-Aal

Lithium borate

Debye model

10.1016/j.physb.2007.04.011

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Citations (79)

Elastic properties and structural studies on some zinc-borate glasses derived from ultrasonic, FT-IR and X-ray techniques

Journal of Alloys and Compounds (2008)

M.S. Gaafar N.S. Abd El-Aal O.W. Gerges Ghada El-Amir

Debye model

Zinc borate

10.1016/j.jallcom.2008.07.114

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Citations (156)

Facile synthesis of graphene sheets decorated nanoparticles and flammability of their polymer nanocomposites

Polymer Degradation and Stability (2016)

Nour F. Attia N.S. Abd El-Aal Mohamed Hassan

Exfoliation joint

Acrylonitrile butadiene styrene

Polymer nanocomposite

10.1016/j.polymdegradstab.2016.01.017

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Citations (74)

A.C. conductivity and relaxation dynamics in zinc–borate glasses

Progress in Natural Science Materials International (2012)

Ghada E. El-Falaky Osiris W. Guirguis N.S. Abd El-Aal

The frequency-dependent dielectric dispersion of ZnO–Na2O–Al2O3–B2O3 (in mol%) glass prepared by the melt quenching technique is investigated in the temperature ranges from room temperature to 420 K. Dielectric relaxation has been analyzed based on the behavior of electric modulus behavior. An analysis of the real and imaginary parts of dielectric is performed assuming the ideal Debye behavior as confirmed by Cole–Cole plot. The activation energy associated with the dielectric relaxation determined from the electric modulus spectra was found to be 1.863 eV, which is close to that the activation energy for d.c. conductivity (1.871 eV), indicating the similar nature of relaxation and conductivity.

Cole–Cole equation

Debye

Zinc borate

10.1016/j.pnsc.2012.03.012

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Citations (50)

Study the influence of oxygen-deficient (δ = 0.135) in SrFeO_3-δ nanoparticles perovskite on structural, electrical and magnetic properties

The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics (2020)

A. Abd El-Naser E. K. Abdel-Khalek Ahmed Nabhan D. A. Rayan M.S. Gaafar

In this report, SrFeO3-δ nanoparticle perovskite sample was prepared by the co-precipitation method. Rietveld refinement of the X-ray diffraction (XRD) data of SrFeO3-δ sample showed that it has a cubic phase (space group: Pm3 m). The morphology and average size (11.15 nm) of the SrFeO3-δ nanoparticle samples were characterised by the high-resolution transmission electron microscope (HRTEM). Mössbauer spectroscopy and X-ray photoelectron spectroscopy (XPS) results showed that the iron exists in different oxidation states. The SrFeO3-δ nanoparticle sample exhibits a small energy band gap in the visible region. The ferroelectric nature in SrFeO3-δ nanoparticle sample has been deduced from the dielectric measurement which is confirmed by differential scanning calorimetric (DSC) study. The magnetic order in SrFeO3-δ nanoparticle sample has been deduced from the magnetic measurement which confirmed by Mössbauer spectroscopic study. Based on the obtained results, we concluded the presence of multiferroic nature in SrFeO3-δ nanoparticle sample.

Rietveld Refinement

10.1080/14786435.2020.1862427

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Citations (16)

Structural Analysis of Some Alkali Diborate Glasses

Acta Physica Polonica A (2009)

Yasser B. Saddeek M.S. Gaafar N.S. Abd El-Aal L. Abd El-Latif

This manuscript presents a theoretical analysis of the correlation between the computed bulk modulus and the structure of a series of multicomponent sodium diborate based glasses in terms of the bond compression model.The main parameters in the analysis were the computed elastic moduli, the average stretching force constant and the average atomic ring size.These parameters were calculated for every glass series and for every glass composition.The results showed that the average force constant and the elastic moduli of these glasses are sensitive to the decrease in the sodium diborate content.This behaviour was attributed to the increase in the molar volume, and to the role of the different modifiers.

Constant (computer programming)

10.12693/aphyspola.116.211

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Citations (22)

Elastic and structural properties of vanadium–lithium–borate glasses

The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics (2008)

M.A. Sidkey Amin Abd El-Moneim M.S. Gaafar N.S. Abd El-Aal L. Abd El-Latif

The ternary xV2O5–(40 − x)Li2O–60B2O3 glass system, where x = 1, 2, 3, 4 and 6 mol%, was prepared by normal quenching. Ultrasonic velocities and attenuation were measured at room temperature using a pulse-echo technique. Various parameters, such as elastic moduli, micro-hardness, Poisson's ratio and Debye temperature, were determined from the measured densities and velocities. The composition dependence of these parameters, in addition to the glass-transition temperature, suggested that vanadium ions were incorporated into these glasses as a network modifier, resulting in the reconversion of BO4 tetrahedra to BO3 triangles by the breaking of B–O–B linkages and the formation of nonbridging oxygens (NBOs). The outcome was a reduction in network connectivity and rigidity with increasing V2O5 content. The results are explained quantitatively in terms of fractal bond connectivity, average atomic volume, network dimensionality, packing density, number of network bonds per unit volume, cross-link density and atomic ring size. The Makishima and Mackenzie model appears to be valid for the studied glasses when the fate of BO4 tetrahedra and creation of NBOs are taken into account.

Lithium borate

Debye model

Coordination number

10.1080/14786430802279752

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Citations (29)

Ultrasonic relaxation in Zinc–Borate glasses

Current Applied Physics (2011)

Ghada E. El-Falaky M.S. Gaafar N.S. Abd El-Aal

Zinc borate

10.1016/j.cap.2011.09.009

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Citations (33)