Influence of impurities on the thermoelectric properties of layered anisotropic PbBi{sub 4}Te{sub 7} compound: Experiment and calculations

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Semiconductors

DOI:https://doi.org/10.1134/S1063782610060072· OSTI ID:21562284

Nemov, S A; Muhtarova, A A ^[1]; Shelimova, L E; Svechnikova, T E ^[2]; Konstantinov, P P ^[3]

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1. St. Petersburg State Politechnical University (Russian Federation)
2. Russian Academy of Sciences, Baikov Institute of Metallurgy and Materials Science (Russian Federation)
3. Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)

The kinetic coefficients of high-quality single crystals of ternary layered n-PbBi{sub 4}Te{sub 7} compounds have been measured in the temperature range of 77-400 K. These crystals, doped with electroactive Cd and Ag impurities, were grown by Czochralski pulling with melt supply through a floating crucible. A significant anisotropy of the thermoelectric properties is found. The means of incorporation of electroactive impurities into the ternary compound lattice is established. The experimental values of the Nernst-Ettingshausen coefficient have been analyzed together with the Seebeck, Hall, and conductivity data. The features of transport phenomena in PbBi{sub 4}Te{sub 7} can be explained within the single-band model of nonparabolic energy spectrum and mixed mechanism of electron scattering from acoustic phonons and the Coulomb potential of impurities. It is suggested that acoustic phonon scattering is dominant along the cleavage plane, whereas the impurity scattering dominates along the trigonal axis.

• OSTI ID: 21562284
• Journal Information: Semiconductors, Journal Name: Semiconductors Journal Issue: 6 Vol. 44; ISSN SMICES; ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CLEAVAGE
COULOMB FIELD
CRUCIBLES
CRYSTALS
DOPED MATERIALS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTRONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMIONS
IMPURITIES
LEPTONS
MATERIALS
MICROSTRUCTURE
MONOCRYSTALS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SCATTERING
SPECTRA
TEMPERATURE RANGE
THERMOELECTRIC PROPERTIES