title: Design and synthesis of a new layered thermoelectric material LaPbBiS3O.
abstract: A new quinary oxysulfide LaPbBiS3O was designed and successfully synthesized via a solid-state reaction in a sealed evacuated quartz tube. This material, composed of stacked NaCl-like [M4S6] (where M = Pb, Bi) layers and fluorite-type [La2O2] layers, crystallizes in the tetragonal space group P4/nmm with a = 4.0982(1) Å, c = 19.7754(6) Å, and Z = 2. Electrical resistivity and Hall effect measurements demonstrate that it is a narrow gap semiconductor with an activation energy of ∼17 meV. The thermopower and the figure of merit at room temperature were measured to be -52 μV/K and 0.23, respectively, which makes LaPbBiS3O and its derivatives be promising for thermoelectric applications.
authors.affiliation: Department of Physics, Zhejiang University , Hangzhou 310027, China.
authors.forename: Yun-Lei
authors.initials: YL
authors.lastname: Sun
authors.forename: Abduweli
authors.initials: A
authors.lastname: Ablimit
authors.forename: Hui-Fei
authors.initials: HF
authors.lastname: Zhai
authors.forename: Jin-Ke
authors.initials: JK
authors.lastname: Bao
authors.forename: Zhang-Tu
authors.initials: ZT
authors.lastname: Tang
authors.forename: Xin-Bo
authors.initials: XB
authors.lastname: Wang
authors.forename: Nan-Lin
authors.initials: NL
authors.lastname: Wang
authors.forename: Chun-Mu
authors.initials: CM
authors.lastname: Feng
authors.forename: Guang-Han
authors.initials: GH
authors.lastname: Cao