Bonding arrangement in Sn doped Se-Te glassy alloy: Far IR study

International Conference and Exhibition on Mesoscopic & Condensed Matter Physics

June 22-24, 2015 Boston, USA

Raman Sharma1, Pawan Heera1,2 and Anup Kumar1

1Himachal Pradesh University, India 2Govt. College Amb, India

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

The chalcogenide glasses have been the subject of great interest due to their wide technological applications. The chalcogenide materials containing Te show high transmittance, i.e., 2-12 �¼m, in the IR region. In the present work far infrared transmission spectra of Se30Te70-xSnx (x=0, 1.5, 2.5 and 4.5) glassy alloys have been studied, at room temperature, in the spectral range 30â��700 cmâ��1. Various structural parameters have been investigated in the light of existing models such as function of average coordination number and valence force field theory using force constants. The overall mean bond energy of a covalent network for a ternary system is interpreted in terms of vibrations of isolated molecular units, to preserve fourfold and twofold coordination for Sn and chalcogen atoms (Se, Te), respectively. The infrared spectra of Se30Te70- xSnx glassy alloy has been explained by assigning different modes to the observed bands. It is found that Sn forms bond with Se, having bond energy 49.23 kcal/mol, and is favored by the CONM model. It may be due to the fact that replacement of Te with Sn leads to absorptions that occur at longer wavelength. It is observed that addition of Sn results in shifting of infrared spectra towards lower frequency with formation of new bands as reported in the earlier studies. It has been correlated with the structural changes occurring in the alloy due to the addition of Sn.

Biography :

Raman Sharma has completed my PhD from Himachal Pradesh University, Shimla, India. He joined as faculty member in July 1999, at Physics Department, H. P. U., Shimla. He remained Chair person of the department from February 2013 to March 2015. He has been a member of various academic committees in the University. He has published more than 50 papers in reputed journals of international repute and has been serving as reviewer for different Journals of repute. His research interest includes theory, simulations as well as experimental study. Presently he is working on pristine and hetero structure nano tubes, chalcogenide materials, and trapped quantum gases.

Email: sramanb70@mailcity.com, pawanheera@yahoo.com