Electrical conduction mechanism in Se90-xTe5Sn5Inx (x = 0, 3, 6 and 9) multi-component glassy alloys

Indra Sen Ram,Prabhakar Singh,Kedar Singh,Rajesh Kumar Singh,Sunil Kumar

doi:10.1063/1.4929577

Indra Sen Ram, Prabhakar Singh + Show 3 more

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https://doi.org/10.1063/1.4929577

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Abstract

Electrical conductivity of Se90-xTe5Sn5Inx (x = 0, 3, 6 and 9) glassy systems was studied employing impedance spectroscopic technique in the frequency range 100 Hz to 1 MHz and in the temperature range 308-388 K. The DC conductivity (σdc) at each temperature was evaluated from the low frequency plateau region for all the samples under investigation. The bulk conductivity for each sample was also evaluated from Nyquist impedance plots. The semicircle shape of Nyquist plot exhibit dipolar nature of samples. The activation energy for glassy, amorphous and crystalline region from the Arrhenius plot of the DC conductivity and bulk conductivity was evaluated. From the results it is found that activation energy varied from 0.091 to 0.194 eV in glassy, 0.686 to 0.002 eV in amorphous and 0.215 to 0.503 eV in crystalline region. The activation energy (ΔE) from DC conductivity and bulk conductivity found to be close in corresponding regions. The pre-exponential factor was also calculated for all three regions.

Highlights

Chalcogenide glasses are semiconductor materials which have a wide variety of applications in electronic industry
The activation energy (∆E) from DC conductivity and bulk conductivity found to be close in corresponding regions
The frequency independent region in low frequency range can be assigned as DC conductivity and frequency dependent dispersion region can be assigned to the hopping motion or AC conductivity of the system

Summary

INTRODUCTION

Chalcogenide glasses are semiconductor materials which have a wide variety of applications in electronic industry. The electrical properties of selenium (Se) based chalcogenide glasses have received attention because of its successful applications.[1,2,3,4,5,6,7,8,9,10] Due to unique reversible transformation properties amorphous Se has wide commercial applications.[11] But, pure Se has disadvantages owing to its short lifetime and low photosensitivity. To overcome these problems certain additives (e.g. Te, Sn, In, Sb etc.) are used to prepare binary glassy systems. The pre-exponential factor is evaluated and discussed for all the samples under investigation

EXPERIMENTAL DETAILS

RESULTS AND DISCUSSION

CONCLUSIONS