Electrical and thermal transport properties of (TlBiS2)1 x(2PbS)xalloys
Year: 2003
Type: article
Abstract: A high efficiency of thermoelectric conversion can be achieved by using materials with a maximum figure of merit Z, i.e. materials with a high Seebeck coefficient S, high electrical conductivity a and low thermal conductivity K. Investigations of transport phenomena in alloys of the (TlBiS 2 ) 1-x (2PbS) x system have shown that in solid solutions of type (A 3 B 5 C 6 2) 1-x (2A 4 B 6 ) x cation substitution according to the scheme 2A 4(+2) → A 3(+1) + B 5(+3) leads to a strong decrease in lattice thermal conductivity K L . In an area (X = 0.50) of the K L = f (C) curve the lattice part of the thermal conductivity of (TlBiS 2 ) 1-x (2PbS) x alloys decreases to 0.26 W m -1 K -1 , which is approaching the theoretical minimum. As a result, the dependence of the thermoelectric figure of merit on composition Z = f(C) of alloys of the (TlBiS 2 ) 1-x (2PbS) x system passes through a maximum in the area X = 0.50, exceeding by ∼25% the respective value of Z for lead sulfide at room temperature.
Authors: N S Popovich, V K Shura
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2021403009