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Published May 2015 | Published
Journal Article Open

Origin of resistivity anomaly in p-type leads chalcogenide multiphase compounds

Abstract

The electrical resistivity curves for binary phase compounds of p-type lead chalcogenide (PbTe)_((0.9−x)) (PbSe) _(0.1) (PbS)_ x, (x = 0.15, 0.2, 0.25), which contain PbS-rich secondary phases, show different behaviour on heating and cooling between 500-700 K. This is contrast to single phase compounds which exhibit similar behaviour on heating and cooling. We correlate these anomalies in the electrical resistivities of multiphase compounds to the variation in phase composition at high temperatures. The inhomogeneous distribution of dopants between the matrix and secondary phase is found to be crucial in the electronic transport properties of the multiphase compounds. These results can lead to further advances in designing composite Pb-chalcogenides with high thermoelectric performance.

Additional Information

© 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. Received 19 July 2014; accepted 2 December 2014; published online 27 February 2015. This work is supported by Australian Research Council (ARC) Discovery Early Career Award DE130100310, the Materials Project funded by U.S. Department of Energy's Basic Energy Sciences program under Grant No. EDCBEE, DOE contract DE-AC02-05CH11231 and the Air Force Office of Scientific Research – Multidisciplinary Research Program of the University Research Initiative (AFOSR-MURI) and the Russian Ministry of Education.

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August 20, 2023
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