Phase morphology effects on the thermoelectric properties of Pb 0.25Sn0.25Ge0.5Te

Yaniv Gelbstein

doi:10.1016/j.actamat.2012.11.027

Phase morphology effects on the thermoelectric properties of Pb _0.25Sn_0.25Ge_0.5Te

Yaniv Gelbstein

Department of Materials Engineering

Ben-Gurion University of the Negev

Research output: Contribution to journal › Article › peer-review

Abstract

Seeking novel thermoelectric materials for power generation applications, the p-type Pb_0.25Sn_0.25Ge_0.5Te composition is currently being investigated. This composition, lying in the miscibility gap of the quasi-ternary phase diagram of PbTe-GeTe-SnTe, exhibits a tendency for phase separation into fine submicron domains in addition to nearly optimized electronic properties. The maximal figure of merit, ZT, of ∼1.2 was obtained at 450 °C, showing a high thermoelectric potential. Possible routes for further enhancement of ZT up to ∼1.8, upon precise controlling of the morphological alignment of the involved phases, are described.

Original language	American English
Pages (from-to)	1499-1507
Number of pages	9
Journal	Acta Materialia
Volume	61
Issue number	5
DOIs	https://doi.org/10.1016/j.actamat.2012.11.027
State	Published - 1 Mar 2013

Keywords

Phase separation
Spinodal decomposition
Thermoelectric

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2012.11.027

Cite this

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title = "Phase morphology effects on the thermoelectric properties of Pb 0.25Sn0.25Ge0.5Te",

abstract = "Seeking novel thermoelectric materials for power generation applications, the p-type Pb0.25Sn0.25Ge0.5Te composition is currently being investigated. This composition, lying in the miscibility gap of the quasi-ternary phase diagram of PbTe-GeTe-SnTe, exhibits a tendency for phase separation into fine submicron domains in addition to nearly optimized electronic properties. The maximal figure of merit, ZT, of ∼1.2 was obtained at 450 °C, showing a high thermoelectric potential. Possible routes for further enhancement of ZT up to ∼1.8, upon precise controlling of the morphological alignment of the involved phases, are described.",

keywords = "Phase separation, Spinodal decomposition, Thermoelectric",

author = "Yaniv Gelbstein",

note = "Funding Information: The author would like to acknowledge Dr. Sergey Remennik from the Department of Materials Engineering at BGU, for his major contribution in interpretation of the SAED patterns. The work was supported by the United States–Israel Binational Science Foundation (BSF) , Grant No. 2008114 .",

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T1 - Phase morphology effects on the thermoelectric properties of Pb 0.25Sn0.25Ge0.5Te

AU - Gelbstein, Yaniv

N1 - Funding Information: The author would like to acknowledge Dr. Sergey Remennik from the Department of Materials Engineering at BGU, for his major contribution in interpretation of the SAED patterns. The work was supported by the United States–Israel Binational Science Foundation (BSF) , Grant No. 2008114 .

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AB - Seeking novel thermoelectric materials for power generation applications, the p-type Pb0.25Sn0.25Ge0.5Te composition is currently being investigated. This composition, lying in the miscibility gap of the quasi-ternary phase diagram of PbTe-GeTe-SnTe, exhibits a tendency for phase separation into fine submicron domains in addition to nearly optimized electronic properties. The maximal figure of merit, ZT, of ∼1.2 was obtained at 450 °C, showing a high thermoelectric potential. Possible routes for further enhancement of ZT up to ∼1.8, upon precise controlling of the morphological alignment of the involved phases, are described.

KW - Phase separation

KW - Spinodal decomposition

KW - Thermoelectric

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DO - 10.1016/j.actamat.2012.11.027

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