Electrical and Galvanomagnetic Properties of Extruded Samples of Bi85Sb15 Solid Solutions with Pb and Te Impurities

The effect of tellurium impurities on the electrical conductivity (sigma), Seebeck coefficient (), and Hall coefficient R of extruded Bi85Sb15 + 0.001 at.% Pb is studied in the temperature range 77-300 K. It is found that doping with tellurium impurities up to 0.001 at. % compensating acceptor Pb atoms leads to a strong decrease in the electron density and, consequently, to an increase in sigma and significant decrease in the values of and R. The materials obtained can be used as the n-branch of thermoelements operating at temperatures of similar to 77 K.