Structural phase transitions and thermoelectric properties of AgPb 18SbTe 20 under compression

Ravhi S. Kumar; Mahalingam Balasubramanian; Matthew Jacobsen; Arunkumar Bommannavar; Mercouri Kanatzidis; Seiji Yoneda; Andrew L. Cornelius

doi:10.1007/s11664-010-1088-5

Structural phase transitions and thermoelectric properties of AgPb ₁₈SbTe ₂₀ under compression

Ravhi S. Kumar, Mahalingam Balasubramanian, Matthew Jacobsen, Arunkumar Bommannavar, Mercouri Kanatzidis, Seiji Yoneda, Andrew L. Cornelius

Emerging and Solid-State Batteries

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

9 Scopus citations

Abstract

The high-figure-of-merit thermoelectric material AgPb ₁₈SbTe ₂₀ has been investigated by in situ angular-dispersive x-ray diffraction (XRD) and x-ray absorption fine-structure (XAFS) measurements up to 30 GPa. Resistivity and thermopower were measured with Bridgman-type opposed metal anvil cells. The results show that the ambient cubic (Fm̄3m) structure transforms to orthorhombic (Pnma) at 6.4 GPa and then to the CsCl-type (Pm̄3m) structure at 15 GPa. The ambient cubic (Fm̄3m) phase is found to be recoverable on releasing the pressure. The thermoelectric power is found to increase with pressure for the cubic phase. The XAFS studies performed at the Pb L ₃-edge and Ag K-edge along with resistivity studies complement the XRD findings.

Original language	English
Pages (from-to)	1828-1831
Number of pages	4
Journal	Journal of Electronic Materials
Volume	39
Issue number	9
DOIs	https://doi.org/10.1007/s11664-010-1088-5
State	Published - Sep 2010

Funding

This work, or portions of it, were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT is supported by DOE-BES, DOE-NNSA, NSF, and the W.M. Keck Foundation. APS is supported by DOE-BES under Contract No. DE-AC02-06CH11357. Work at PNC/XOR supported by the US DOE-BES, NSERC (Canada), and its founding members. Funding support form ONT is acknowledged.

Keywords

AgPb SbTe
structural phase transition
x-ray diffraction

Access to Document

10.1007/s11664-010-1088-5

Cite this

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title = "Structural phase transitions and thermoelectric properties of AgPb 18SbTe 20 under compression",

abstract = "The high-figure-of-merit thermoelectric material AgPb 18SbTe 20 has been investigated by in situ angular-dispersive x-ray diffraction (XRD) and x-ray absorption fine-structure (XAFS) measurements up to 30 GPa. Resistivity and thermopower were measured with Bridgman-type opposed metal anvil cells. The results show that the ambient cubic (F{\=m}3m) structure transforms to orthorhombic (Pnma) at 6.4 GPa and then to the CsCl-type (P{\=m}3m) structure at 15 GPa. The ambient cubic (F{\=m}3m) phase is found to be recoverable on releasing the pressure. The thermoelectric power is found to increase with pressure for the cubic phase. The XAFS studies performed at the Pb L 3-edge and Ag K-edge along with resistivity studies complement the XRD findings.",

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AU - Kumar, Ravhi S.

AU - Balasubramanian, Mahalingam

AU - Jacobsen, Matthew

AU - Bommannavar, Arunkumar

AU - Kanatzidis, Mercouri

AU - Yoneda, Seiji

AU - Cornelius, Andrew L.

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AB - The high-figure-of-merit thermoelectric material AgPb 18SbTe 20 has been investigated by in situ angular-dispersive x-ray diffraction (XRD) and x-ray absorption fine-structure (XAFS) measurements up to 30 GPa. Resistivity and thermopower were measured with Bridgman-type opposed metal anvil cells. The results show that the ambient cubic (Fm̄3m) structure transforms to orthorhombic (Pnma) at 6.4 GPa and then to the CsCl-type (Pm̄3m) structure at 15 GPa. The ambient cubic (Fm̄3m) phase is found to be recoverable on releasing the pressure. The thermoelectric power is found to increase with pressure for the cubic phase. The XAFS studies performed at the Pb L 3-edge and Ag K-edge along with resistivity studies complement the XRD findings.

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