Effects of crystal-alignment and grain shape on the thermoelectric properties of Bi 0.5Sb 1.5Te 3 alloys

Koo Chul Je; Beyungduk Ko; Cham Kim; Hoyoung Kim; Dong Hwan Kim

doi:10.1016/j.jallcom.2011.12.030

Effects of crystal-alignment and grain shape on the thermoelectric properties of Bi _0.5Sb _1.5Te ₃ alloys

Koo Chul Je
, Beyungduk Ko
, Cham Kim
, Hoyoung Kim
, Dong Hwan Kim

Division of Nanotechnology

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

5 Scopus citations

Abstract

We investigated the thermoelectric properties of sintered Bi _0.5Sb _1.5Te ₃ alloys containing grains for their alignment, sizes and shapes. The figure of merit can be improved as the result of lower resistivity by increasing the alignment, which is realized by using the spark plasma sintering method and a strong magnetic field. In addition, making the grains more spherical can improve the thermoelectric efficiency as a result of carrier quantum confinement and enhancement of the band gap energy.

Original language	English
Pages (from-to)	75-79
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	517
DOIs	https://doi.org/10.1016/j.jallcom.2011.12.030
State	Published - 15 Mar 2012

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( NRF-2010-0021173 ) and by Gyeongbuk Province and Gyeongju City through their support of the DGIST's Green Energy Research in the Republic of Korea.

Keywords

Alignment
Grain shape
Quantum confinement
Thermoelectric properties

Access to Document

10.1016/j.jallcom.2011.12.030

Cite this

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title = "Effects of crystal-alignment and grain shape on the thermoelectric properties of Bi 0.5Sb 1.5Te 3 alloys",

abstract = "We investigated the thermoelectric properties of sintered Bi 0.5Sb 1.5Te 3 alloys containing grains for their alignment, sizes and shapes. The figure of merit can be improved as the result of lower resistivity by increasing the alignment, which is realized by using the spark plasma sintering method and a strong magnetic field. In addition, making the grains more spherical can improve the thermoelectric efficiency as a result of carrier quantum confinement and enhancement of the band gap energy.",

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note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( NRF-2010-0021173 ) and by Gyeongbuk Province and Gyeongju City through their support of the DGIST's Green Energy Research in the Republic of Korea.",

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T1 - Effects of crystal-alignment and grain shape on the thermoelectric properties of Bi 0.5Sb 1.5Te 3 alloys

AU - Je, Koo Chul

AU - Ko, Beyungduk

AU - Kim, Cham

AU - Kim, Hoyoung

AU - Kim, Dong Hwan

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( NRF-2010-0021173 ) and by Gyeongbuk Province and Gyeongju City through their support of the DGIST's Green Energy Research in the Republic of Korea.

PY - 2012/3/15

Y1 - 2012/3/15

N2 - We investigated the thermoelectric properties of sintered Bi 0.5Sb 1.5Te 3 alloys containing grains for their alignment, sizes and shapes. The figure of merit can be improved as the result of lower resistivity by increasing the alignment, which is realized by using the spark plasma sintering method and a strong magnetic field. In addition, making the grains more spherical can improve the thermoelectric efficiency as a result of carrier quantum confinement and enhancement of the band gap energy.

AB - We investigated the thermoelectric properties of sintered Bi 0.5Sb 1.5Te 3 alloys containing grains for their alignment, sizes and shapes. The figure of merit can be improved as the result of lower resistivity by increasing the alignment, which is realized by using the spark plasma sintering method and a strong magnetic field. In addition, making the grains more spherical can improve the thermoelectric efficiency as a result of carrier quantum confinement and enhancement of the band gap energy.

KW - Alignment

KW - Grain shape

KW - Quantum confinement

KW - Thermoelectric properties

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DO - 10.1016/j.jallcom.2011.12.030

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