Research Article Effect of Concurrent ZnO Addition and AlF 3 Reduction on the Elastic Properties of Tellurite Based Glass System Haji Abdul Aziz Sidek, 1 Raouf El-Mallawany, 2 Krishnaswamy Hariharan, 3 and Shaharuddin Rosmawati 1 1 Glass, Ceramic and Composite Research Group, Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia 2 Department of Physics, Faculty of Science, Menoia University, Shebin Al-Kom, Egypt 3 Department of Physics, Indian Institute of Technology Madras, Chennai, India Correspondence should be addressed to Haji Abdul Aziz Sidek; sidek@upm.edu.my Received 30 April 2014; Revised 19 June 2014; Accepted 19 June 2014; Published 8 July 2014 Academic Editor: Changgui Lin Copyright © 2014 Haji Abdul Aziz Sidek et al. his is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. New ternary zinc oxyluorotellurite (ZOFT) with the composition (ZnO)  -(AlF 3 )  -(TeO 2 )  , where 5≤<35; 5≤≤25; 60 ≤  ≤ 70, has been successfully prepared by the conventional rapid melt quenching technique. Density, molar volume, and glass transition temperature have been assessed for each ZOFT glass sample. he longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system at 5 MHz frequency and room temperature. he longitudinal modulus (), shear modulus (), Young’s modulus (), bulk modulus (), and Poisson’s ratio () are assessed from both velocity data and their respective density. he compositional dependence of the ultrasonic velocities and related parameters are discussed to understand the rigidity and compactness of the glass system studied. 1. Introduction Tellurite glasses are very interesting glasses due to their unique physical properties and applications [1–12]. Tellurite glass was applied at the back of amorphous silicon solar cells in combination with a rear relector to improve the eiciency of the cell [3]. he propagation of ultrasonic waves in solids provides valuable information about the solid state motion in the material. In recent years, the subject of glasses has rapidly increased because of their various applications in electronics, nuclear and solar energy technologies, and acoustooptic devices [11, 12]. he acoustic wave propagation in bulk glasses has been of considerable interest to understand their mechanical properties. Elastic properties provide infor- mation on the structures of solids which are directly related to the interatomic potentials. Glasses are isotropic and have only two independent elastic constant: longitudinal and shear elastic moduli. hese two parameters are obtained from the longitudinal and shear sound velocities and density of the glass [13]. An extensive series of research works related to elastic properties of binary, ternary, and quaternary tellurite glasses have been carried out recently [14–23]. he choice of new ternary glass series, namely, zinc oxyluorotellurite (ZOFT), is of particular interest since they are expected to have chemical durability and thermal stability representing a compromise between pure luoride and oxide glass with lexible optical properties. Furthermore, the intro- duction of metal halides into the system could improve such properties and will decrease their hygroscopic behaviour which limits the applications of many pure halides glasses. Also, the main objective of the current work is to study the efect of concurrent ZnO addition and AlF 3 reduction on the density and the elastic properties of zinc tellurite glass systems. 2. Materials and Experimental Method Zinc oxyluorotellurite (ZOFT) with the composition (ZnO)  -(AlF 3 )  -(TeO 2 )  , where 5≤<35; 5≤≤25; Hindawi Publishing Corporation Advances in Condensed Matter Physics Volume 2014, Article ID 174362, 7 pages http://dx.doi.org/10.1155/2014/174362