LAUSR

Abstract β-In 2 S 3 was developed as a potential thermoelectric material both experimental and computational. In this work, Mg doped In 2 S 3 samples were prepared by conventional solid-state reaction method followed by pulsed current sintering. For In 2- x Mg x S 3 (0 ≤  x  ≤ 0.20), the prepared samples maintains tetragonal β -In 2 S 3 phase while α-In 2 S 3 with cubic structure were obtained at x  ≥ 0.30. The both Mg and S concentrations were less than the nominal values, and the lack of S naturally lead to an effective increase of electron concentration in the bands crossing the Fermi level. The lattice thermal conductivity was reduced by the Mg-substitution, and the value of ZT reached 0.53 at 700 K for x  = 0.05, which is 1.4 times larger than that of non-doped sample.