Effect of processing parameters on thermoelectric properties of p-type (Bi2Te3)0.25(Sb2Te3)0.75 prepared via BMA-HP method

J. Yang, T. Aizawa, A. Yamamoto, T. Ohta

Research output: Contribution to journalArticle

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Abstract

Starting from elemental granules of Bi, Sb, and Te, p-type (Bi2Te3)0.25(Sb2Te3)0.75 thermoelectric materials was prepared via bulk mechanical alloying (BMA) plus subsequent hot pressing (HP) method in this paper. (Bi2Te3)0.25(Sb2Te3)0.75 solid solution phase appeared after 200 cycles' BMA, and alloying proceeded with increasing BMA cycles. The figures of merit (Z) of the as hot pressed samples increased with BMA cycles' increasing and leveled off after 800 cycles. Increasing the hot pressing temperature from 260 to 420 °C, electrical and thermal conductivity increased; relative densities, figures of merit of the as HPed samples also increased. The maximum figure of merit is obtained as 2.99×10-3K-1 with the processing parameter of 800 cycle BMA and hot pressing at 420 °C, 1.2GPa for 1 h. Further prolonging BMA cycles and increasing hot pressing temperature, no evident improvement to thermoelectric properties was resulted in.

Original languageEnglish
Pages (from-to)90-94
Number of pages5
JournalMaterials Chemistry and Physics
Volume70
Issue number1
DOIs
Publication statusPublished - 2001 Apr 2
Externally publishedYes

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hot pressing
Mechanical alloying
Hot pressing
alloying
cycles
Processing
figure of merit
thermoelectric materials
Alloying
Solid solutions
Thermal conductivity
solid solutions
thermal conductivity
Temperature
conductivity
electrical resistivity
temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Effect of processing parameters on thermoelectric properties of p-type (Bi2Te3)0.25(Sb2Te3)0.75 prepared via BMA-HP method. / Yang, J.; Aizawa, T.; Yamamoto, A.; Ohta, T.

In: Materials Chemistry and Physics, Vol. 70, No. 1, 02.04.2001, p. 90-94.

Research output: Contribution to journalArticle

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abstract = "Starting from elemental granules of Bi, Sb, and Te, p-type (Bi2Te3)0.25(Sb2Te3)0.75 thermoelectric materials was prepared via bulk mechanical alloying (BMA) plus subsequent hot pressing (HP) method in this paper. (Bi2Te3)0.25(Sb2Te3)0.75 solid solution phase appeared after 200 cycles' BMA, and alloying proceeded with increasing BMA cycles. The figures of merit (Z) of the as hot pressed samples increased with BMA cycles' increasing and leveled off after 800 cycles. Increasing the hot pressing temperature from 260 to 420 °C, electrical and thermal conductivity increased; relative densities, figures of merit of the as HPed samples also increased. The maximum figure of merit is obtained as 2.99×10-3K-1 with the processing parameter of 800 cycle BMA and hot pressing at 420 °C, 1.2GPa for 1 h. Further prolonging BMA cycles and increasing hot pressing temperature, no evident improvement to thermoelectric properties was resulted in.",
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