Investigations on the Thermal and Elastic Properties of ZnO-Incorporated Phosphate Glasses and Glass Ceramics |
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Authors: | Samickannian Aravindan Venkatachalam Rajendran Nallaiyan Rajendran |
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Affiliation: | 1. Department of Physics , Government Arts College (Autonomous) , Salem , 636007 , Tamil Nadu , India;2. Centre for Nano Science and Technology , K.S. Rangasamy College of Technology , Tiruchengode , 637215 , Tamil Nadu , India;3. Department of Chemistry , Anna University Chennai, CEG Campus , Chennai , 600025 , Tamil Nadu , India |
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Abstract: | Abstract Glasses of the 45P2O5-(40-x)CaO-15Na2O-xZnO system with increasing zinc oxide (ZnO) concentrations within the ranges of 3 ≤ x ≤ 12 mol% were obtained by employing the melt-quench technique. ZnO inclusions in the phosphate glass network lead to increases in its density and, conversely, a decrease in its molar volume. On the basis of the obtained thermal analysis data, the glasses underwent thermal treatment, which helped to derive their glass ceramic equivalents. The evaluations of structural and elastic properties of glasses before and after thermal treatments were made using X-ray diffraction (XRD) studies and ultrasonic nondestructive testing. The differential thermal analysis data show the reduction in the crystallization tendency and increase in thermal properties, such as crystallization temperature (T P), thermal stability (T c – T g) (where Tc is crystallization onset temperature and T g is glass transition temperature), thermal stability parameter (S), and degree of glassification (D g) of phosphate glasses against the progressive additions of ZnO. The XRD of glass ceramics confirmed the dominance of metaphosphate, pyrophosphate, and ZnO-related crystalline features. The measured elastic moduli, such as longitudinal (L), shear (G), Young's (Y), and bulk (K), and Vicker's microhardness values increased in both glass and glass ceramics with an increase in ZnO incorporation. |
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Keywords: | Zinc phosphate glass thermal treatment differential thermal analysis ultrasonic characterization elastic moduli |
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