TY - JOUR
T1 - Reduction of thermal conductivity in PbTe:Tl by alloying with TlSbTe 2
AU - Wang, Heng
AU - Charoenphakdee, Anek
AU - Kurosaki, Ken
AU - Yamanaka, Shinsuke
AU - Snyder, G. Jeffrey
PY - 2011/1/27
Y1 - 2011/1/27
N2 - A series of single-phase polycrystalline (TlSbTe2) x(Tl0.02Pb0.98Te)1-x (x=0, 0.05,0.1) compounds were made to reduce thermal conductivity while maintaining the enhanced Seebeck coefficients found in PbTe doped with Tl. Transport property measurements confirmed that high Seebeck coefficients from doping with Tl are retained by alloying with TlSbTe2. At the same time, a thermal conductivity as low as 0.8 W/mK at room temperature, and 0.6 W/mK at 673 K was observed, corresponding to a 30% reduction in lattice thermal conductivity at 673 K compared with 2%Tl-PbTe. However, the maximum zT in this system is 0.8 (at 623 K), which is lower than that of 2%Tl-PbTe prepared in this work (1.2 at 673 K) owing to a decrease of the charge-carrier mobility when alloying with TlSbTe2. Possible influences on the mobility are discussed.
AB - A series of single-phase polycrystalline (TlSbTe2) x(Tl0.02Pb0.98Te)1-x (x=0, 0.05,0.1) compounds were made to reduce thermal conductivity while maintaining the enhanced Seebeck coefficients found in PbTe doped with Tl. Transport property measurements confirmed that high Seebeck coefficients from doping with Tl are retained by alloying with TlSbTe2. At the same time, a thermal conductivity as low as 0.8 W/mK at room temperature, and 0.6 W/mK at 673 K was observed, corresponding to a 30% reduction in lattice thermal conductivity at 673 K compared with 2%Tl-PbTe. However, the maximum zT in this system is 0.8 (at 623 K), which is lower than that of 2%Tl-PbTe prepared in this work (1.2 at 673 K) owing to a decrease of the charge-carrier mobility when alloying with TlSbTe2. Possible influences on the mobility are discussed.
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U2 - 10.1103/PhysRevB.83.024303
DO - 10.1103/PhysRevB.83.024303
M3 - Article
AN - SCOPUS:79551591669
SN - 1098-0121
VL - 83
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
M1 - 024303
ER -