Results for “Pd3(PbSe)2” | Engineering Papers

DOE OSTI2020

Materials Data on Pd3(PbSe)2 by Materials Project

Pd3(PbSe)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Pd is bonded in a distorted linear geometry to four Pb and two equivalent Se atoms. There are two shorter (3.03 Å) and two longer (3.04 Å) Pd–Pb bond lengths. Both Pd–Se bond lengths are 2.48 Å. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded to six equivalent Pd and two equivalent Se atoms to form corner-sharing PbPd6Se2 hexagonal bipyramids. Both Pb–Se bond lengths are 3.18 Å. In the second Pb site, Pb is bonded in a hexagonal planar geometry to six equivalent Pd atoms. Se is bonded in a 4-coordinate geometry to three equivalent Pd and one Pb atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Nucleation and growth of PbSeO 3 , Pb 3 (CO 3 ) 2 (OH) 2 , and Se on the PbSe surfaces by decomposing PbSe in water

PbSe materials are widely researched and utilized in visible-infrared photodetectors, displays, transistors, thermoelectric devices, and photovoltaics. However, the instability of PbSe limits practical utilization. The decomposition mechanisms of PbSe needs to be clarified for guiding targeted design to improve its stability. Here, we studied the decomposition process of PbSe in water, which is exposed to air, by using ex-situ and semi in situ transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and electron tomography reconstruction (ETR). We found that, besides water molecules, PbSe particles also react with O 2 and CO 2 that are adsorbed in water from air. Pd 3 (CO 3 ) 2 (OH) 2 , PbSeO 3 , and Se nucleate and grow on the surface of PbSe powders. This work provides understanding of the mechanism of materials nucleation, growth, and decomposition. Furthermore, the findings can be used as a reference to improve the stability and lifetime of PbSe devices.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗