American Chemical Society, Inorganic Chemistry, 19(52), p. 11288-11294, 2013
DOI: 10.1021/ic401516m
Full text: Unavailable
Exchanging one Ge2+ with two Li+ per formula unit in (GeTe)n(Sb2Te3) (n = 1, 2, 3, .) eliminates cation vacancies, because it leads to an equal number of cations and anions. This substitution results in the solid solution (GeTe)x(LiSbTe2)2 (with x = n – 1, but n not necessarily an integer). For x 6, (GeTe)x(LiSbTe2)2 forms a GeTe-type structure that shows a phase transition to a cubic high-temperature phase at ca. 280 °C. The thermoelectric properties of (GeTe)11(LiSbTe2)2 have been investigated and show that this compound is a promising thermoelectric material with a ZT value of 1.0 at 450 °C. The high ZT value of the thermodynamically stable compound is caused by a low phononic contribution to the thermal conductivity; probably, Li acts as a “pseudo-vacancy”.