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Title: Calorimetric and Optical Study of Amorphous Se85 − xTe15Bix Glassy Alloy
Authors: Sharma, Ambika
Barman, P.B.
Keywords: Glass transition
Activation energy
Optical band gap
Issue Date: 2009
Publisher: Jaypee University of Information Technology, Solan, H.P.
Abstract: Bulk samples of Se85 − xTe15Bix (where x=0, 1, 2, 3, 4, 5) glassy alloys are obtained by melt quenching technique. Differential scanning calorimetric (DSC) technique has been applied to determine the thermal properties of Se-rich Se85 − xTe15Bix glassy alloys in the glass transition and crystallization regions at four heating rates (5, 10, 15, 20 K min−1). The glass transition temperature (Tg) and peak crystallization temperature(Tp) are found to shift to a higher temperature with increasing heating rate. With Bi addition, the value of (Tg)increases. (Tp) is found to increase as Bi is introduced to the Se–Te host, however further increase in Bi concentration is responsible for the reduction of. Thin film of bulk samples are deposited on glass substrate using thermal evaporation technique under vacuum for optical characterization. Optical band gap is estimated using Tauc's extrapolation and is found to decrease from 1.46 to 1.24 eV with the Bi addition.
Description: Thin Solid Films 517 (2009) 3020–3023
ISSN: 0040-6090
Appears in Collections:Journal Articles

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