Thermal anomalies in ternary Ge42-xPbxSe58 glasses near the charge carrier reversal threshold

Ramesh, K and Prashantha, M and Gopal, ESR and Reddy, N Koteeswara (2009) Thermal anomalies in ternary Ge42-xPbxSe58 glasses near the charge carrier reversal threshold. In: Journal of applied physics, 106 (11).

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Abstract

The carrier type reversal (CTR) from p- to n-type in semiconducting chalcogenide glasses is an important and a long standing problem in glass science. Ge-Se glasses exhibit CTR when the metallic elements Bi and Pb are added. For example, bulk Ge42-xSe58Pbx glasses exhibit CTR around 8-9 at. % of Pb. These glasses have been prepared by melt quenching method. Glass transition temperature (T-g), Specific heat change between the liquid and the glassy states (Delta C-p) at T-g and the nonreversing heat flow (Delta H-nr) measured by modulated differential scanning calorimetry exhibit anomalies at 9 at. % of Pb. These observed anomalies are interpreted on the basis of the nano scale phase separation occurring in these glasses.

Item Type:	Journal Article
Publication:	Journal of applied physics
Publisher:	American Institute of Physics
Additional Information:	Copyright for this article belongs to American Institute of Physics.
Keywords:	chalcogenide glasses; differential scanning calorimetry; enthalpy; germanium compounds; glass transition; lead compounds; phase separation; selenium compounds; specific heat; vitreous state
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	12 Jan 2010 08:51
Last Modified:	19 Sep 2010 05:54
URI:	http://eprints.iisc.ac.in/id/eprint/25372

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