Dislocation-induced ultra-low lattice thermal conductivity in rare earth doped β-Zn4Sb3

Vaithinathan Karthikeyan; Clement Manohar Arava; May Zin Hlaing; Baojie Chen; Chi Hou Chan; Kwok-Ho Lam; Vellaisamy A.L. Roy

doi:10.1016/j.scriptamat.2019.08.037

Dislocation-induced ultra-low lattice thermal conductivity in rare earth doped β-Zn₄Sb₃

Vaithinathan Karthikeyan, Clement Manohar Arava, May Zin Hlaing, Baojie Chen, Chi Hou Chan, Kwok-Ho Lam, Vellaisamy A.L. Roy^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

24 Citations (Scopus)

Abstract

Defect engineering in thermoelectric materials leads to the formation of exotic transport properties. Specifically, reduction in lattice thermal conductivity (к_L) can be realized through scattering of low and high-frequency phonons by interfacial and point defects respectively. Herein we explore such phenomena by inducing dense dislocations through doping of rare earth (RE) impurities in β-(Zn_1−xRE_x)₄Sb₃ [x = 0.3–0.5 at.%] as phonon scattering source of all frequencies. Lattice anharmonicity created results in an ultra-low к_L of ~0.15 W/mK for β-(Zn_0.997 Yb_0.003)₄Sb₃. Vibrational properties and phonon scattering altered by the lattice anharmonicity are studied in detail through terahertz and infrared spectroscopies.

Original language	English
Pages (from-to)	95-101
Number of pages	7
Journal	Scripta Materialia
Volume	174
Online published	5 Sept 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.08.037
Publication status	Published - 1 Jan 2020

Funding

We acknowledge grants from the Environmental Conservation Fund project no: ECF 44/2014 and Research Grants Council of Hong Kong Special Administrative Region Project no: T42-103/16N . We thank Dr. Abhijit Pramanick for helpful discussions during the preparation of this manuscript.

Research Keywords

Anharmonicity
Defect engineering
Impurity-doping
Lattice dislocations
Thermal conductivity
Thermoelectrics

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Cite this

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title = "Dislocation-induced ultra-low lattice thermal conductivity in rare earth doped β-Zn4Sb3",

abstract = "Defect engineering in thermoelectric materials leads to the formation of exotic transport properties. Specifically, reduction in lattice thermal conductivity (кL) can be realized through scattering of low and high-frequency phonons by interfacial and point defects respectively. Herein we explore such phenomena by inducing dense dislocations through doping of rare earth (RE) impurities in β-(Zn1−xREx)4Sb3 [x = 0.3–0.5 at.%] as phonon scattering source of all frequencies. Lattice anharmonicity created results in an ultra-low кL of ~0.15 W/mK for β-(Zn0.997 Yb0.003)4Sb3. Vibrational properties and phonon scattering altered by the lattice anharmonicity are studied in detail through terahertz and infrared spectroscopies.",

keywords = "Anharmonicity, Defect engineering, Impurity-doping, Lattice dislocations, Thermal conductivity, Thermoelectrics",

author = "Vaithinathan Karthikeyan and Arava, {Clement Manohar} and Hlaing, {May Zin} and Baojie Chen and Chan, {Chi Hou} and Kwok-Ho Lam and Roy, {Vellaisamy A.L.}",

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T1 - Dislocation-induced ultra-low lattice thermal conductivity in rare earth doped β-Zn4Sb3

AU - Karthikeyan, Vaithinathan

AU - Arava, Clement Manohar

AU - Hlaing, May Zin

AU - Chen, Baojie

AU - Chan, Chi Hou

AU - Lam, Kwok-Ho

AU - Roy, Vellaisamy A.L.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Defect engineering in thermoelectric materials leads to the formation of exotic transport properties. Specifically, reduction in lattice thermal conductivity (кL) can be realized through scattering of low and high-frequency phonons by interfacial and point defects respectively. Herein we explore such phenomena by inducing dense dislocations through doping of rare earth (RE) impurities in β-(Zn1−xREx)4Sb3 [x = 0.3–0.5 at.%] as phonon scattering source of all frequencies. Lattice anharmonicity created results in an ultra-low кL of ~0.15 W/mK for β-(Zn0.997 Yb0.003)4Sb3. Vibrational properties and phonon scattering altered by the lattice anharmonicity are studied in detail through terahertz and infrared spectroscopies.

AB - Defect engineering in thermoelectric materials leads to the formation of exotic transport properties. Specifically, reduction in lattice thermal conductivity (кL) can be realized through scattering of low and high-frequency phonons by interfacial and point defects respectively. Herein we explore such phenomena by inducing dense dislocations through doping of rare earth (RE) impurities in β-(Zn1−xREx)4Sb3 [x = 0.3–0.5 at.%] as phonon scattering source of all frequencies. Lattice anharmonicity created results in an ultra-low кL of ~0.15 W/mK for β-(Zn0.997 Yb0.003)4Sb3. Vibrational properties and phonon scattering altered by the lattice anharmonicity are studied in detail through terahertz and infrared spectroscopies.

KW - Anharmonicity

KW - Defect engineering

KW - Impurity-doping

KW - Lattice dislocations

KW - Thermal conductivity

KW - Thermoelectrics

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DO - 10.1016/j.scriptamat.2019.08.037

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SN - 1359-6462

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EP - 101

JO - Scripta Materialia

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