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Structure and thermoelectric properties of the silver lead bismuth selenides Ag5Pb9Bi19Se40 and AgPb3Bi7Se14

Abstract

In the system Ag/Pb/Bi/Se, two new thermoelectric phases derived from lillianite (Pb3Bi2S6) have been characterized. The crystal structures corespond to the 8,8L- and 5,5L-types, respectively, both in the space group Cmcm. The room-temperature unit-cell parameters of 8,8L-Ag5Pb9Bi19Se40 are a = 4.2151(8) Å, b = 13.951(3) Å and c = 35.284(7) Å and those of 5,5L-AgPb3Bi7Se14 are a = 4.2337(8) Å, b = 13.864(2) Å and c = 24.653(3) Å. The temperature-dependent evolution of the lattice parameters of Ag5Pb9Bi19Se40 becomes steeper at temperatures above 300 °C and hints at mobility of Ag+ ions. Samples containing both phases exhibit thermoelectric figures of merit up to ZT = 0.23 at 250 °C. HRTEM investigations on such samples showed well-ordered areas of the lillianite-like phases seperated by large slabs that exhibit a high concentration of defects and may compensate lattice misfits between the lillianite-type phases.

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Publication details

The article was received on 10 May 2018, accepted on 10 Aug 2018 and first published on 11 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT01895B
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Structure and thermoelectric properties of the silver lead bismuth selenides Ag5Pb9Bi19Se40 and AgPb3Bi7Se14

    F. Heinke, F. Nietschke, C. Fraunhofer, I. Dovgaliuk, J. Schiller and O. Oeckler, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01895B

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