title: Structural evolvement and thermoelectric properties of Cu(3-x)Sn(x)Se₃ compounds with diamond-like crystal structures.
abstract: Polycrystalline samples of Cu(3-x)Sn(x)Se3 were synthesized in the composition range x = 0.87-1.05. A compositionally induced evolvement from tetragonal via cubic to monoclinic crystal structures is observed, when the composition changes from a Cu-rich to a Sn-rich one. The Cu(3-x)Sn(x)Se3 materials show a metal-to-semiconductor transition with increasing x. Electronic transport properties are governed by the charge-carrier concentration which is well described by a linear dispersion-band model. The lattice component of the thermal conductivity is practically independent of x which is attributed to the opposite influence of the atomic ordering and the inhomogeneous distribution of the Cu-Se or Sn-Se bonds with different polarities in the crystal structure. The highest thermoelectric figure of merit ZT of 0.34 is achieved for x = 1.025 at 700 K.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, 200050 Shanghai, China. cld@mail.sic.ac.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Fan
authors.forename: Walter
authors.initials: W
authors.lastname: Schnelle
authors.forename: Iryna
authors.initials: I
authors.lastname: Antonyshyn
authors.forename: Igor
authors.initials: I
authors.lastname: Veremchuk
authors.forename: Wilder
authors.initials: W
authors.lastname: Carrillo-Cabrera
authors.forename: Xun
authors.initials: X
authors.lastname: Shi
authors.forename: Yuri
authors.initials: Y
authors.lastname: Grin
authors.forename: Lidong
authors.initials: L
authors.lastname: Chen