Synthesis and Thermoelectric Properties of the YbTe-YbSb System

Airi Kawamura; Yufei Hu; Susan M. Kauzlarich

doi:10.1007/s11664-015-4202-x

Synthesis and Thermoelectric Properties of the YbTe-YbSb System

Airi Kawamura, Yufei Hu, Susan M. Kauzlarich

Chemistry

Research output: Contribution to journal › Article

Abstract

The syntheses of YbTe_1−xSb_x (x = 0, 0.05, 0.2, 0.5, 0.8, 1) were investigated by solid state reactions and formed into dense pellets by spark plasma sintering. X-ray powder diffraction and microprobe analysis indicated no solubility of Sb in YbTe, and these phases are better described as composite phases (YbTe)_1−x(YbSb)_x (x = 0, 0.05, 0.2, 0.5, 0.8, 1). Thermal conductivity, electrical resistivity, and Seebeck coefficients were acquired for the larger values of x (x = 0.2, 0.5, 0.8, 1) from room temperature to 773 K, and the figure of merit was calculated. Thermal conductivities for x = 0, 0.05 are also reported; however, measurements of Seebeck coefficients and electrical resistivity were not possible due to large resistivity. The figure of merit for all samples was low, and the maximum zT measured was zT_791K = 0.018 for YbSb. Low figures of merit were primarily the result of very high resistivity in YbTe rich samples, and high thermal conductivity, and a small Seebeck coefficient in all samples.

Original language	English (US)
Pages (from-to)	1-7
Number of pages	7
Journal	Journal of Electronic Materials
DOIs	https://doi.org/10.1007/s11664-015-4202-x
State	Accepted/In press - Nov 25 2015

Keywords

powder x-ray diffraction
rock-salt structure
seebeck
Thermoelectric composite
transport properties
YbSb
YbTe

ASJC Scopus subject areas

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

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Kawamura, A., Hu, Y., & Kauzlarich, S. M. (Accepted/In press). Synthesis and Thermoelectric Properties of the YbTe-YbSb System. Journal of Electronic Materials, 1-7. https://doi.org/10.1007/s11664-015-4202-x

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abstract = "The syntheses of YbTe1−xSbx (x = 0, 0.05, 0.2, 0.5, 0.8, 1) were investigated by solid state reactions and formed into dense pellets by spark plasma sintering. X-ray powder diffraction and microprobe analysis indicated no solubility of Sb in YbTe, and these phases are better described as composite phases (YbTe)1−x(YbSb)x (x = 0, 0.05, 0.2, 0.5, 0.8, 1). Thermal conductivity, electrical resistivity, and Seebeck coefficients were acquired for the larger values of x (x = 0.2, 0.5, 0.8, 1) from room temperature to 773 K, and the figure of merit was calculated. Thermal conductivities for x = 0, 0.05 are also reported; however, measurements of Seebeck coefficients and electrical resistivity were not possible due to large resistivity. The figure of merit for all samples was low, and the maximum zT measured was zT791K = 0.018 for YbSb. Low figures of merit were primarily the result of very high resistivity in YbTe rich samples, and high thermal conductivity, and a small Seebeck coefficient in all samples.",

keywords = "powder x-ray diffraction, rock-salt structure, seebeck, Thermoelectric composite, transport properties, YbSb, YbTe",

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AB - The syntheses of YbTe1−xSbx (x = 0, 0.05, 0.2, 0.5, 0.8, 1) were investigated by solid state reactions and formed into dense pellets by spark plasma sintering. X-ray powder diffraction and microprobe analysis indicated no solubility of Sb in YbTe, and these phases are better described as composite phases (YbTe)1−x(YbSb)x (x = 0, 0.05, 0.2, 0.5, 0.8, 1). Thermal conductivity, electrical resistivity, and Seebeck coefficients were acquired for the larger values of x (x = 0.2, 0.5, 0.8, 1) from room temperature to 773 K, and the figure of merit was calculated. Thermal conductivities for x = 0, 0.05 are also reported; however, measurements of Seebeck coefficients and electrical resistivity were not possible due to large resistivity. The figure of merit for all samples was low, and the maximum zT measured was zT791K = 0.018 for YbSb. Low figures of merit were primarily the result of very high resistivity in YbTe rich samples, and high thermal conductivity, and a small Seebeck coefficient in all samples.

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