Effects of Fe 2O 3 replacement of ZnO on elastic and structural properties of 80TeO 2-(20 - X)ZnO-xFe 2O 3 tellurite glass system

• Published in: Journal of Non-Crystalline Solids
• Main Author: 2-s2.0-84861865972
• Format: Article
• Language: English
• Published: 2012
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861865972&doi=10.1016%2fj.jnoncrysol.2012.04.017&partnerID=40&md5=46591357ad2ec5616b1fd3dcd494ee5f

Ternary tellurite glasses with the chemical formula 80TeO 2-(2 - x)ZnO-xFe 2O 3 (x = 0-15 mol%) have been prepared by the melt-quenching method. Elastic and structural properties of the glasses were investigated by measuring both longitudinal and shear velocities using the pulse-echo overlap method at 5 MHz and Fourier transform infrared (FTIR) spectroscopy, respectively. Both longitudinal and shear velocity showed a large increase of 3.40% and 4.68%, respectively, at x = 5 mol% before a smaller increase for x > 5 mol%. Interestingly, longitudinal modulus (L), shear modulus (G), bulk modulus (K) and Young's modulus (E) recorded similar trends with increase in Fe 2O 3. The initial large increases in shear and longitudinal velocity and related elastic moduli observed at x = 5 mol% are suggested to be due to structural modification which enhances rigidity of the glass network. FTIR analysis showed increase in bridging oxygen (BO) as indicated by the relative intensity of the TeO 4 assigned peaks and increase in intensity of the FeO 6 assigned peak (∼ 451 cm - 1) which indicates that Fe acts as a modifier in the glass network. The increase in rigidity of the glass system is suggested to be due to the increase of BO together with the formation of strong covalent FeO bond. Quantitative analysis based on the bulk compression and ring deformation models showed that the k bc/k exp value decreased gradually from 2.41 (x = 0 mol%) to 2.02 (x = 15 mol%) which infers that the glass system became a relatively more open 3D network as Fe 2O 3 was increased. © 2012 Elsevier B.V. All rights reserved.