Thermoelectric properties of Bi-Sb extruded alloys prepared by plasticity processing

Lee, Yong-Hoon; Koyanagi, T.; Tabuchi, Toshihide; Sano, Shiro

doi:10.1109/ict.2003.1287507

Cited by 1 publication

(1 citation statement)

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“…In most studies, alloys corresponding to the semiconducting region and containing more than 8 at.0%0 Sb were studied. [12][13][14][15] It was established that values of Z in polycrystalline samples decrease compare to those in monocrystalline ones. In [13], for solid solutions in the concentration range 8 -17 at.0%0 Sb, the possibility of enhancing Z of polycrystalline samples by a long homogenizing annealing (200 days) at 523 K after quenching the melt in liquid nitrogen was shown.…”

Section: Introductionmentioning

confidence: 99%

Anomalies in the isotherms of the thermoelectric properties of Bi-Sb solid solutions

Рогачева

Дроздова

Dresselhaus

2006

2006 25th International Conference on Thermoelectrics

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The goal of the present work is a detailed study of the thermoelectric property-composition dependences of polycrystalline Bi-Sb solid solutions in the range of 0 -15 at.%0 Sb. The Seebeck coefficient, electrical conductivity, Hall coefficient, and magnetoresistance were measured in the temperature range 77 -300 K. In the isotherms of these properties, distinct extrema were observed in the certain concentration ranges. The presence of the concentration anomalies is attributed to 1) the transition from the dilute impurity range to the impurity continuum and possible selforganization processes accompanying this transition; 2) the reconstruction of the energy band structure under increasing Sb concentration. It was established that the maximum values of the figure of merit Z reached in the semiconductor region for the studied polycrystals, practically correspond to the values of Z observed in single crystals in the direction perpendicular to a trigonal axis. The obtained results should be taken into account when developing new thermoelectric materials based on Bi-Sb solid solutions.

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