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language
eng
Author
Description
β-FeSi2 is called the “environment-friendly thermoelectric semiconductor” but the origin of its high thermoelectromotive power is still unknown. In the present study, the temperature-dependence data of the electrical conductivity, the Hall coefficient, and the Seebeck coefficient on bulk single crystal p-type β-FeSi2 samples reported in literature have been analyzed in a multi-band model. In the model, the effects of the 2nd maximum of the valence band, the 2nd minimum of the conduction band, and an acceptor impurity band are included and are proved to be important. Through the simultaneous fits to the temperature-dependence data of the three transport coefficients, the effective masses of holes at the 1st and the 2nd maximum of the valence band and those of electrons at the 1st and the 2nd minimum of the conduction band are deduced together with the energy separations among the bands. In addition, by including the temperature-dependent Hall factor for impurity hopping conduction, impurity concentrations have been significantly corrected from those previously estimated in a simple two-band model.
Subject
Thermoelectric materials
Electrical transport
Impurity conduction
Hall effect
Journal Title
Journal of Alloys and Compounds
Volume
846
ISSN
0925-8388
Published Date
2020-12-15
DOI
Publisher
Elsevier B.V.
NII Type
Journal Article
Format
PDF
Text Version
著者版
Gyoseki ID
39068
OAI-PMH Set
Faculty of Science and Engineering