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# Optical and Thermal Diffusivity Measurement of Ge-Se-Te Glasses by Photoacoustic Technique

Ganesan, R and Madhusoodanan, KN and Srinivasan, C and Sangunni, KS and Gopal, ESR (1999) Optical and Thermal Diffusivity Measurement of Ge-Se-Te Glasses by Photoacoustic Technique. In: Physica Status Solidi (b), 212 . pp. 223-228.

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## Abstract

The composition dependence of optical energy gap $(E_g)$ and thermal diffusivity (\alpha) in three sets of Ge-Se-Te glasses, namely, ${Ge}_x{Se}_{80-x}{Te}_{20}$ 5\leq x \leq40 ${Ge}_x{Se}_{75-x}{Te}_{25}$ 5\leq x \leq40 and ${Ge}_x{Se}_{65-x}{Te}_{35}$ 5\leq x \leq37.5 have been studied using photoacoustic technique. The variation of \alpha with an average coordination number (r) shows a change in the slope at (r) 2:4 and 2.67. ${E_g}$ shows a local maximum at (r) 2:67. The results are discussed on the basis of the topological and chemical threshold exhibited by covalent network glasses. The relative sensitivity of \alpha and ${E_g}$ to these phenomena is discussed.

Item Type: Journal Article The copyright belongs to WILEY-VCH Verlag Berlin GmbH. optical energy gap;photoacoustic technique;glasses;ge;se;te Division of Physical & Mathematical Sciences > Physics 29 Aug 2005 19 Sep 2010 04:19 http://eprints.iisc.ernet.in/id/eprint/3560

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