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Thermoelectric properties of PbTe with indium and bismuth secondary phase

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Abstract

Lead telluride (PbTe) with indium (In) and bismuth (Bi) as micrometer sized secondary phases dispersed throughout the bulk has been prepared by matrix encapsulation method. In and Bi are not found to substitute in PbTe as shown by Rietveld and room temperature Raman studies but are present as secondary phases. Increased values of temperature dependent electrical resistivity and Seebeck coefficient show the effect of interfaces on electronic transport. As expected, thermal conductivity is found to reduce on addition of secondary phases due to a reduced electronic contribution, further confirming that electron scattering at interfaces is more important than phonon scattering in such systems for thermoelectric properties. However, due to the reduction in the power factor of the In and Bi added samples from that of the parent PbTe, the overall thermoelectric figure of merit (zT) does not increase beyond that of PbTe, for which the highest value of 0.7 is obtained at 778 K.

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Acknowledgments

The authors are thankful to Prof. A. M. Umarji for the hot press facility.

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Authors and Affiliations

  1. Thermoelectric Materials and Devices Laboratory, Department of Physics, Indian Institute of Science, Bangalore, Karnataka, 560012, India

    A. Bali, R. Chetty & R. C. Mallik

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  1. A. Bali
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  2. R. Chetty
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  3. R. C. Mallik
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Correspondence to R. C. Mallik.

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Bali, A., Chetty, R. & Mallik, R.C. Thermoelectric properties of PbTe with indium and bismuth secondary phase. Indian J Phys 90, 665–672 (2016). https://doi.org/10.1007/s12648-015-0793-6

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  • DOI: https://doi.org/10.1007/s12648-015-0793-6

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