Publication Type : Journal Article
Publisher : AIP Publishing
Source : Journal of applied physics, AIP Publishing, Volume 92, Number 7, p.3530–3539 (2002)
Url : http://scitation.aip.org/content/aip/journal/jap/92/7/10.1063/1.1503385
Campus : Coimbatore
School : Center for Nanosciences
Center : Center for Industrial Research and Innovation (ACIRI)
Department : Nanosciences
Year : 2002
Abstract : We study the ultra sonic properties of five different samples of Na2O-Li2O-TeO2Na2O-Li2O-TeO2 glass system within the temperature range 140–420 K (for longitudinal polarization) and 140–300 K (for transverse polarization). The variation of ultrasonic velocity of all samples shows negative gradient with temperature and has been explained by the existing theories. No well defined broad peak has been observed in the temperature variation of attenuation and a mixed alkali type peak starts growing at temperature ≈350 K. Composition dependence of elastic properties and density shows maximum or minimum at a critical concentration of Na2O.Na2O. Optical transmission and reflection spectra were recorded in the UV-visible region at room temperature. The physical quantities such as optical energy gap, refractive index and optical dielectric constant were evaluated from the spectra. The theoretical fitting of the optical absorption indicates that the present glass system behaves as indirect gap semiconductor.
Cite this Research Publication : P. Roychoudhury, Sudip Kumar Batabyal, Paul, A., Basu, C., Mukherjee, S., and Goswami, K., “Acoustic and optical properties of (Li2O) 0.2− x (Na2O) x (TeO2) 0.8 glasses”, Journal of applied physics, vol. 92, pp. 3530–3539, 2002.