skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Transport phenomena in mixed layered tetradymite-like compounds in the GeTe-Bi[sub 2]Te[sub 3] system

Abstract

The electrical transport properties of the GeBi[sub 2]Te[sub 4]-, Ge[sub 3]Bi[sub 2]Te[sub 6]-, and GeBi[sub 4]Te[sub 7]-layered compounds were characterized as a function of temperature and for samples with various stoichiometric deviations. The Hall Coefficient and electrical resistivity were measured from 77 to 800 K, and the Seebeck coefficient was determined in the 90--450 K temperature range. The onset of intrinsic conductivity behavior was observed in these ternary compounds at fairly low temperatures. On the basis of the variation of the electrical conductivity at elevated temperatures, energy gap values of 0.24, 0.20, and 0.22 eV were calculated at 0 K for the Ge[sub 3]Bi[sub 2]Te[sub 6], GeBi[sub 2]Te[sub 4], and GeBi[sub 4]Te[sub 7] compounds, respectively. To explain the carrier mobility temperature dependence, a mixed carrier scattering mechanism on acoustic phonons and point defects is proposed at low temperatures. It is found that the contribution of scattering by acoustic phonons increased with temperature. The analysis of experimental data for the GeBi[sub 4]Te[sub 7] compound in the 150--200 K temperature range demonstrated the need for an additional carrier scattering mechanism, probably connected to the order-disorder phenomena in the cation layers. An anomalous temperature dependence of the Hall coefficient was discovered for themore » stoichiometric GeBi[sub 2]Te[sub 4] compound. It is explained by mixed carrier conduction effects due to fluctuations of the composition and the existence of p- and n-type conductivity domains in the GeBi[sub 2]Te[sub 4] crystal.« less

Authors:
 [1]; ; ;  [2];  [3]
  1. (Russian Academy of Science, St. Petersburg (Russian Federation). A.F. Ioffe Physical-Technical Inst.)
  2. (Russian Academy of Sciences, Moscow (Russian Federation). A.A. Baikov Inst. of Metallurgy)
  3. (California Inst. of Tech., Pasadena, CA (United States). Jet Propulsion Lab.)
Publication Date:
OSTI Identifier:
6102741
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 146:2; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH TELLURIDES; CARRIER MOBILITY; ELECTRIC CONDUCTIVITY; EXPERIMENTAL DATA; GERMANIUM TELLURIDES; HALL EFFECT; SEEBECK EFFECT; STOICHIOMETRY; TEMPERATURE DEPENDENCE; BISMUTH COMPOUNDS; CHALCOGENIDES; DATA; ELECTRICAL PROPERTIES; GERMANIUM COMPOUNDS; INFORMATION; MOBILITY; NUMERICAL DATA; PHYSICAL PROPERTIES; TELLURIDES; TELLURIUM COMPOUNDS; 360606* - Other Materials- Physical Properties- (1992-)

Citation Formats

Konstantinov, P.P., Shelimova, L.E., Avilov, E.S., Kretova, M.A., and Fleurial, J.P. Transport phenomena in mixed layered tetradymite-like compounds in the GeTe-Bi[sub 2]Te[sub 3] system. United States: N. p., 1999. Web. doi:10.1006/jssc.1999.8340.
Konstantinov, P.P., Shelimova, L.E., Avilov, E.S., Kretova, M.A., & Fleurial, J.P. Transport phenomena in mixed layered tetradymite-like compounds in the GeTe-Bi[sub 2]Te[sub 3] system. United States. doi:10.1006/jssc.1999.8340.
Konstantinov, P.P., Shelimova, L.E., Avilov, E.S., Kretova, M.A., and Fleurial, J.P. Wed . "Transport phenomena in mixed layered tetradymite-like compounds in the GeTe-Bi[sub 2]Te[sub 3] system". United States. doi:10.1006/jssc.1999.8340.
@article{osti_6102741,
title = {Transport phenomena in mixed layered tetradymite-like compounds in the GeTe-Bi[sub 2]Te[sub 3] system},
author = {Konstantinov, P.P. and Shelimova, L.E. and Avilov, E.S. and Kretova, M.A. and Fleurial, J.P.},
abstractNote = {The electrical transport properties of the GeBi[sub 2]Te[sub 4]-, Ge[sub 3]Bi[sub 2]Te[sub 6]-, and GeBi[sub 4]Te[sub 7]-layered compounds were characterized as a function of temperature and for samples with various stoichiometric deviations. The Hall Coefficient and electrical resistivity were measured from 77 to 800 K, and the Seebeck coefficient was determined in the 90--450 K temperature range. The onset of intrinsic conductivity behavior was observed in these ternary compounds at fairly low temperatures. On the basis of the variation of the electrical conductivity at elevated temperatures, energy gap values of 0.24, 0.20, and 0.22 eV were calculated at 0 K for the Ge[sub 3]Bi[sub 2]Te[sub 6], GeBi[sub 2]Te[sub 4], and GeBi[sub 4]Te[sub 7] compounds, respectively. To explain the carrier mobility temperature dependence, a mixed carrier scattering mechanism on acoustic phonons and point defects is proposed at low temperatures. It is found that the contribution of scattering by acoustic phonons increased with temperature. The analysis of experimental data for the GeBi[sub 4]Te[sub 7] compound in the 150--200 K temperature range demonstrated the need for an additional carrier scattering mechanism, probably connected to the order-disorder phenomena in the cation layers. An anomalous temperature dependence of the Hall coefficient was discovered for the stoichiometric GeBi[sub 2]Te[sub 4] compound. It is explained by mixed carrier conduction effects due to fluctuations of the composition and the existence of p- and n-type conductivity domains in the GeBi[sub 2]Te[sub 4] crystal.},
doi = {10.1006/jssc.1999.8340},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 146:2,
place = {United States},
year = {1999},
month = {9}
}