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Effect of Se Substitution on Structural and Electrical Transport Properties of Bi0.4Sb1.6Se3x Te3(1−x) Hexagonal Rods

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Abstract

In the current study, novel hexagonal rods based on Bi0.4Sb1.6Te3 ingots dispersed with x amount of Se (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) in the form Bi0.4Sb1.6Se3x Te3(1−x) were synthesized via a standard solid-state microwave route. The morphologies of these rods were explored using field-emission scanning electron microscopy (FESEM). The crystal structure of the powders was examined by x-ray diffraction (XRD) analysis, which showed that powders of the 0.0 ≤ x ≤ 0.8 samples could be indexed to the rhombohedral phase, whereas the sample with x = 1.0 had an orthorhombic phase structure. The influence of variations in the Se content on the thermoelectric properties was studied in the temperature range from 300 K to 523 K. Alloying of Se into Bi0.4Sb1.6Te3 effectively caused a decrease in the hole concentration and, thus, a decrease in the electrical conductivity and an increase in the Seebeck coefficient. The maximal power factor measured in the present work was 7.47 mW/mK2 at 373 K for the x = 0.8 sample.

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Authors and Affiliations

  1. School of Physics, Universiti Sains Malaysia, 11800, Pulau Penang, Malaysia

    Arej Kadhim, Arshad Hmood & Haslan Abu Hassan

  2. Department of Physics, College of Science, University of Basrah, Basrah, Iraq

    Arej Kadhim & Arshad Hmood

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  1. Arej Kadhim
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  2. Arshad Hmood
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  3. Haslan Abu Hassan
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Correspondence to Arej Kadhim.

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Kadhim, A., Hmood, A. & Abu Hassan, H. Effect of Se Substitution on Structural and Electrical Transport Properties of Bi0.4Sb1.6Se3x Te3(1−x) Hexagonal Rods. J. Electron. Mater. 42, 1017–1023 (2013). https://doi.org/10.1007/s11664-013-2496-0

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  • DOI: https://doi.org/10.1007/s11664-013-2496-0

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