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ARTICLE

Calculation of the localized and extended energy states density for Ge₆₀Se_40-xTe_x alloy prepared by melting point method

J. H. Azzawi^a, B. A. Ahmed^b, K. A. Jasim^b, E. M. T. Salman^b,*

a Directorate of Education, Diyala, Iraq
b Department of physics, College of Education for pure sciences Ibn Al-Haitham, University of Baghdad, Iraq

* Corresponding Author:

Chalcogenide Letters 2023, 20(9), 649-656. https://doi.org/10.15251/CL.2023.209.649

Received 08 May 2023; Accepted 04 September 2023;

Abstract

The DC electrical conductivity properties of Ge₆₀Se_40-xTe_x alloy with x = 0, 5, 10, 15 and 20). The samples were formed in the form of discs with the thickness of 0.25–0.30 cm and the diameter of 1.5 cm. Samples were pressed under a pressure of 6 tons per cm² , using a ton hydraulic press. They were prepared after being pressed using a ton hydraulic press using a hydraulic press. Melting point technology use to preper the samples. Continuous electrical conductivity properties were recorded from room temperature to 475 K. Experimental data indicates that glass containing 15% Te has the highest electrical conductivity allowing maximum current through the sample compared to Lu with other samples. Therefore, it is found that the DC conductivity increases with increasing Te concentration. The electrical conductivity properties show non-ohmic behavior due to the effects of temperature on the crystal structure of the samples, which indicates that the samples remain semi-conductive after partial replacement. Three conduction mechanisms are also observed for each sample at high, medium, and low temperatures. The Fermi level local and extended state densities and conductance parameters were calculated, and all were found to change with the change of Te concentration.

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Keywords

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