Lattice Distortions in TlInSe2 Thermoelectric Material Studied by X-Ray Absorption Fine Structure

Shinya Hosokawa; Jens Rüdiger Stellhorn; Hiroyuki Ikemoto; Kojiro Mimura; Kazuki Wakita; Nazim Mamedov

doi:10.1002/pssa.201700416

Lattice Distortions in TlInSe₂ Thermoelectric Material Studied by X-Ray Absorption Fine Structure

Shinya Hosokawa^*, Jens Rüdiger Stellhorn, Hiroyuki Ikemoto, Kojiro Mimura, Kazuki Wakita, Nazim Mamedov

^*Corresponding author for this work

Department of Physics

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

5 Scopus citations

Abstract

Tl L_II and In K X-ray absorption fine structure (XAFS) measurements were performed on a TlInSe₂ thermoelectric material in the temperature range of 25–300 K including the incommensurate–commensurate phase transition temperature of about 135 K. Most of the bond lengths obtained from the present XAFS measurements are in good agreement with existing X-ray diffraction data at room temperature, while only the Tl-Tl correlation shows inconsistent values indicating the commensurate properties of the Tl chains expected from the thermodynamic properties. The present XAFS data clearly support positional fluctuations of the Tl atoms found in three-dimensional atomic images reconstructed from X-ray fluorescence holography.

Original language	English
Article number	1700416
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	215
Issue number	1
DOIs	https://doi.org/10.1002/pssa.201700416
State	Published - 2018/01

Keywords

incommensurate-commensurate phase change
local structures
positional fluctuations
thermoelectric materials

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry
Surfaces, Coatings and Films
Electrical and Electronic Engineering
Surfaces and Interfaces

Access to Document

10.1002/pssa.201700416

Cite this

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title = "Lattice Distortions in TlInSe2 Thermoelectric Material Studied by X-Ray Absorption Fine Structure",

abstract = "Tl LII and In K X-ray absorption fine structure (XAFS) measurements were performed on a TlInSe2 thermoelectric material in the temperature range of 25–300 K including the incommensurate–commensurate phase transition temperature of about 135 K. Most of the bond lengths obtained from the present XAFS measurements are in good agreement with existing X-ray diffraction data at room temperature, while only the Tl-Tl correlation shows inconsistent values indicating the commensurate properties of the Tl chains expected from the thermodynamic properties. The present XAFS data clearly support positional fluctuations of the Tl atoms found in three-dimensional atomic images reconstructed from X-ray fluorescence holography.",

keywords = "incommensurate-commensurate phase change, local structures, positional fluctuations, thermoelectric materials",

author = "Shinya Hosokawa and Stellhorn, {Jens R{\"u}diger} and Hiroyuki Ikemoto and Kojiro Mimura and Kazuki Wakita and Nazim Mamedov",

note = "Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2018",

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AU - Hosokawa, Shinya

AU - Stellhorn, Jens Rüdiger

AU - Ikemoto, Hiroyuki

AU - Mimura, Kojiro

AU - Wakita, Kazuki

AU - Mamedov, Nazim

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AB - Tl LII and In K X-ray absorption fine structure (XAFS) measurements were performed on a TlInSe2 thermoelectric material in the temperature range of 25–300 K including the incommensurate–commensurate phase transition temperature of about 135 K. Most of the bond lengths obtained from the present XAFS measurements are in good agreement with existing X-ray diffraction data at room temperature, while only the Tl-Tl correlation shows inconsistent values indicating the commensurate properties of the Tl chains expected from the thermodynamic properties. The present XAFS data clearly support positional fluctuations of the Tl atoms found in three-dimensional atomic images reconstructed from X-ray fluorescence holography.

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