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Issue 35, 2018
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Structure and thermoelectric properties of the silver lead bismuth selenides Ag5Pb9Bi19Se40 and AgPb3Bi7Se14

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Abstract

In the system Ag/Pb/Bi/Se, two new thermoelectric phases derived from lillianite (Pb3Bi2S6) have been characterized. The crystal structures correspond 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 the 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 separated by large slabs that exhibit a high concentration of defects and may compensate for lattice misfits between the lillianite-type phases.

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

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Article information


Submitted
10 May 2018
Accepted
10 Aug 2018
First published
11 Aug 2018

Dalton Trans., 2018,47, 12431-12438
Article type
Paper

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, 47, 12431
DOI: 10.1039/C8DT01895B

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