Synthesis, crystal and electronic structure of a new ternary parkerite selenide Pt3Pb2Se2

Abstract A new platinum-based ternary selenide, Pt3Pb2Se2 was successfully synthesized at 1123 K by using a traditional solid-state method. It crystallizes in a orthorhombic structure with the Cmcm space group, and consists of quasi-2D [Pt3Pb2Se2] layers connected by inherent Pt–Pb bonds. It is related to the parkerite structures with half transition metal occupation. Therefore, it belongs to the half anti-perovskite family structure. The R-T curve reveals its metallic behavior and shows high conductivity (RRR = 20.5) at room temperature. The X-ray photoelectron and ultraviolet photoelectron spectroscopy spectrums were collected. It has low work function (φ = −4.02 eV). First principles calculations were consistent with the experimental results.