Relationship between Thermoelectric Properties and Microstructure on p-Type (Bi2Te3)0.25(Sb2Te3)0.75 System Using Milled Powder

Takeo TOKIAI; Takashi UESUGI; Kunihito KOUMOTO

doi:10.2109/jcersj.103.1182

Relationship between Thermoelectric Properties and Microstructure on p-Type (Bi₂Te₃)_0.25(Sb₂Te₃)_0.75 System Using Milled Powder

Takeo TOKIAI, Takashi UESUGI, Kunihito KOUMOTO

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Keywords: Bismuth telluride, Thermoelectrics, PIES method, Figure of merit, Compressive strength, Seebeck coefficient, Thermal conductivity, Planetary ball mill, Hot isostatic press, Anisotropy

JOURNAL FREE ACCESS

1995 Volume 103 Issue 1203 Pages 1182-1187

DOI https://doi.org/10.2109/jcersj.103.1182

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Abstract

We have developed p-type bismuth telluride of (Bi₂Te₃)_0.25(Sb₂Te₃)_0.75 system with modified PIES method, which shows the figure of merit and compressive strength of 1.6×10^-3/K(25°C), and 9.8 MPa, respectively. Thermoelectric properties showed no anisotropy of electrical transport phenomena because the microstructure had no orientation of the grain growth. The improved compressive strength was presumably due to small grain sizes. The milling mechanism obeyed Kick's law.

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