The thermoelectric properties of Ag1-x (Pb1 -y Sn y ) m Sb1 -z Te m+2 (4≤m≤16, -0.1≤x≤0.3, 1/3≤y≤2/3, 0.2≤z≤0.4; Lead Antimony Silver Tellurium Tin, LASTT-m) compositions were investigated in the temperature range of 300 to ~670K. All samples crystallize in the average NaCl-type structure without any noticeable second phase and exhibit very narrow bandgaps of 0.9Pb5Sn5Sb0.8Te12 mainly due to the very low lattice thermal conductivity of ~0.4W/(mK) around 660K. Also, samples with charge-balanced stoichiometries, Ag(Pb1 -y Sn y ) m SbTe m+2, were studied and found to exhibit a lower power factor and higher lattice thermal conductivity than the Ag1 -x (Pb1 -y Sn y ) m Sb1 -z Te m+2 compositions.
ASJC Scopus subject areas
- Condensed Matter Physics
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Ceramics and Composites
- Electronic, Optical and Magnetic Materials
- Materials Chemistry