Effect of composition on thermoelectric properties in PbTe-Bi 2Te 3 composites

Ju Hyuk Yim; Kyooho Jung; Hyo Jung Kim; Hyung Ho Park; Chan Park; Jin Sang Kim

doi:10.1007/s11664-010-1485-9

Effect of composition on thermoelectric properties in PbTe-Bi ₂Te ₃ composites

Ju Hyuk Yim, Kyooho Jung, Hyo Jung Kim, Hyung Ho Park, Chan Park, Jin Sang Kim

Department of Materials Science and Engineering

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

13 Citations (Scopus)

Abstract

The solidification of alloys in the Bi ₂Te ₃-PbTe pseudobinary system at off- and near-eutectic compositions was investigated for their microstructure and thermoelectric properties. Dendritic and lamellar structures were clearly observed due to the phase separation and the existence of a metastable ternary phase. In this system, three phases with different compositions were observed: binary Bi ₂Te ₃, PbTe, and metastable PbBi ₂Te ₄. The Seebeck coefficient, electrical resistivity, and thermal conductivity of ternary alloys as well as binary compounds were measured. The phonon thermal conductivities of Pb-Bi-Te alloys were lower than those in binary PbTe and Bi ₂Te ₃, which could have resulted from the increased interfacial area between phases due to the existence of the metastable ternary phase and the resultant phase separation.

Original language	English
Pages (from-to)	1010-1014
Number of pages	5
Journal	Journal of Electronic Materials
Volume	40
Issue number	5
DOIs	https://doi.org/10.1007/s11664-010-1485-9
Publication status	Published - 2011 May

Bibliographical note

Funding Information:
This research was supported by the Converging Research Center Program through the Ministry of Education, Science, and Technology (2010K000979) and the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (# K0006007).

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

Access to Document

10.1007/s11664-010-1485-9

Cite this

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title = "Effect of composition on thermoelectric properties in PbTe-Bi 2Te 3 composites",

abstract = "The solidification of alloys in the Bi 2Te 3-PbTe pseudobinary system at off- and near-eutectic compositions was investigated for their microstructure and thermoelectric properties. Dendritic and lamellar structures were clearly observed due to the phase separation and the existence of a metastable ternary phase. In this system, three phases with different compositions were observed: binary Bi 2Te 3, PbTe, and metastable PbBi 2Te 4. The Seebeck coefficient, electrical resistivity, and thermal conductivity of ternary alloys as well as binary compounds were measured. The phonon thermal conductivities of Pb-Bi-Te alloys were lower than those in binary PbTe and Bi 2Te 3, which could have resulted from the increased interfacial area between phases due to the existence of the metastable ternary phase and the resultant phase separation.",

author = "Yim, {Ju Hyuk} and Kyooho Jung and Kim, {Hyo Jung} and Park, {Hyung Ho} and Chan Park and Kim, {Jin Sang}",

note = "Funding Information: This research was supported by the Converging Research Center Program through the Ministry of Education, Science, and Technology (2010K000979) and the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (# K0006007).",

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AU - Yim, Ju Hyuk

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AU - Kim, Hyo Jung

AU - Park, Hyung Ho

AU - Park, Chan

AU - Kim, Jin Sang

N1 - Funding Information: This research was supported by the Converging Research Center Program through the Ministry of Education, Science, and Technology (2010K000979) and the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (# K0006007).

PY - 2011/5

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AB - The solidification of alloys in the Bi 2Te 3-PbTe pseudobinary system at off- and near-eutectic compositions was investigated for their microstructure and thermoelectric properties. Dendritic and lamellar structures were clearly observed due to the phase separation and the existence of a metastable ternary phase. In this system, three phases with different compositions were observed: binary Bi 2Te 3, PbTe, and metastable PbBi 2Te 4. The Seebeck coefficient, electrical resistivity, and thermal conductivity of ternary alloys as well as binary compounds were measured. The phonon thermal conductivities of Pb-Bi-Te alloys were lower than those in binary PbTe and Bi 2Te 3, which could have resulted from the increased interfacial area between phases due to the existence of the metastable ternary phase and the resultant phase separation.

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