R. El-Mallawany, Amin Abd El-Moneim, I. Z. Hager, H. Mahfouz, H. A. Othman
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引用次数: 0
Abstract
In this work, the elastic properties of two tellurite glass series 80TeO2-(20−x)WO3-xBi2O3 (80TeWBi) and 70TeO2-(30−x)WO3-xBi2O3 (70TeWBi) (where x = 0 mol.%, 5 mol.%, and 10 mol.%) were quantitatively analyzed and predicted. Many structural and compositional parameters, including the density of network bonds, mean cross-link density, average bond-stretching force constant, total packing density, and dissociation energy per unit volume, were calculated using bond compression (BC), ring deformation (RD), and Makishima–Mackenzie (M–M) models. These parameters were correlated with experimental elastic properties to explore the structural role of WO3 and Bi2O3 in the tellurite network. It was found that WO3 enters the tellurite network of Bi2O3-free 80TeO2-20WO3 and 70TeO2-30WO3 glasses as a network former. This stiffened the structure through the formation of WO4 tetrahedral units, WO6 octahedral units, and Te–O–W linkages. As a result, the theoretical bulk modules (Kbc) increased from 73.23 GPa to 83.90 GPa whereas the theoretical Poisson's ratio decreased from 0.235 to 0.225 with increasing WO3 mol.%. Meanwhile, Bi2O3 enters the network of TeO2-WO3-Bi2O3 glasses as a network modifier. This weakens the glass structure and results in the transformation of some TeO4 trigonal bipyramids into TeO3 trigonal pyramids by breaking the Te–O–W linkages and creating non-bridging oxygen atoms. Excellent agreement was achieved between the theoretical and experimental values of elastic moduli and Poisson's ratio.
期刊介绍:
The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications.
Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field.
A journal of The Minerals, Metals & Materials Society.