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

Glasses in the system (1 − x) [29Na 2O− 4Al 2O 3− 67B 2O 3]− xZnO (0 ≤ x ≤ 35 mol%), have been prepared by the melt quenching technique. Elastic properties, X-ray and FT-IR spectroscopic studies have been employed to study the role of ZnO on the structure of the investigated glass system. Elastic pr...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-05, Vol.475 (1), p.535-542
Main Authors: Gaafar, M.S., El-Aal, N.S. Abd, Gerges, O.W., El-Amir, G.
Format: Article
Language:English
Subjects:
Borate glasses
Condensed matter: structure, mechanical and thermal properties
Elastic moduli
Elasticity, elastic constants
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
FT-IR and X-ray spectroscopy
Glass transitions
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
Specific phase transitions
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Ultrasonic wave velocity
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Summary:Glasses in the system (1 − x) [29Na 2O− 4Al 2O 3− 67B 2O 3]− xZnO (0 ≤ x ≤ 35 mol%), have been prepared by the melt quenching technique. Elastic properties, X-ray and FT-IR spectroscopic studies have been employed to study the role of ZnO on the structure of the investigated glass system. Elastic properties and Debye temperature have been investigated using sound wave velocity measurements at 4 MHz at room temperature. The results showed that the density increases and the molar volume decreases while both sound velocities and the determined glass transition temperatures decrease with increase in x. X-ray and infrared spectra of the glasses reveal that the borate network consists of diborate units and is affected by the increase in the concentration of ZnO content. These results are interpreted in terms of the decrease in the N 4 values (fraction of tetrahedral coordinated boron atoms), and substitution of longer bond lengths of Zn–O in place of shorter B–O bond. The results indicate that Zinc ions have been substituted for boron ions as tetrahedral network former ions. The elastic moduli are observed to increase with the increase of ZnO content.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.07.114