Lead sulfide structure

Lead fluoride, 193 Lead halides, 197 bivalent structure, 193 Lead iodide, 194 Lead oxide structure, 202 Lead phosphates, 222 Lead selenide structure, 202 Lead sulfate, 222 Lead sulfide structure, 202 Lead tclluride structure, 202 Lewisite, 256 Lipophilicity... 

Cathodic deposition of lead sulfide from acidic aqueous solutions of Pb(II) ions (nitrate salts mainly) and Na2S203 on various metallic substrates at room temperature has been reported. Stoichiometric PbS films composed of small crystallites (estimated XRD diameter 13 nm) of RS structure were obtained at constant potential on Ti [204]. Also, single-phase, polycrystalline thin films of RS PbS were electrode-posited potentiostatically on Ti, Al, and stainless steel (SS) [205]. It was found that the Al and Ti substrates promoted growth of PbS with prominent (200) and (111)... 

So, if both sodium and lead are defined as metals and chlorine and sulfur as nonmetals, why is sodium chloride so different from lead sulfide Something appears to be missing in our definition of a metal. It is true that metals tend to lose electrons to nonmetals in a chemical reaction, but that definition turns out to be so broad that it is not very useful. How, then, should a metal be defined The answer was arrived at years before the electronic structure of atoms was known. Simply put, metals are best defined by their common physical properties ... 

We show by X-ray diffraction in the Bragg-Brentano geometry that the atomic stmcture of lead sulfide nanoparticles in thin films prepared by wet chemical method is different from the B stmcture, which is the equilibrium phase for bulk single-crystalline PbS. The atomic structure of nanoparticles can be desaibed by the cubic space group Fm-3m with both tetrahedral and octahedral coordinations for sulfur atoms. 

Lead sulfide (PbS) is a narrow band gap semiconductor used for many optical applications, like IR detectors [1], It is well known that semiconducting properties of PbS can be tailored by reducing the size of particles down to the nanometer scale. Semiconducting properties are greatly affected by the atomic structure. However, the atomic structure of nanoparticles may not be the same as the structure of the same substance in bulk. This paper focuses on study of the atomic structure of PbS nanoparticles. 

Lead sulfide QDs of 4.5 nm in size embedded in glass and colloid matrices have been studied using picosecond pump-probe differential absorption and luminescence techniques. Energy and temporal characteristics of charge carriers relaxation processes by direct electron-hole recombination and through deep surface defect states are evaluated. An influence of type of matrix on the defect structure and relaxation rate is discussed. 

Morozov PV, Khnykov AY, Grigor ev El, Zav yalov SA, Klimenko VG, Chvalun SN, et al. Structure and optical properties of poly-/ -xylylene-lead sulfide nanocomposites derived by vapor deposition polymerization. Nano-technol Russ 2012 7(l-2) 41-6. 

Peng, X. G Guan, S. Q., Chai, X. D., Jiang, Y. S., and Li, T. J., Preparation and. structure of Q-state lead sulfide monolayers in meiastable stearic acid Langmuir-Blodgett films, J. Phys. Chem., 96, 3170-3174 (1992). 

The predominantly ionic alkali metal sulfides M2S (Li, Na, K, Rb, Cs) adopt the antifluorite structure (p. 118) in which each S atom is surrounded by a cube of 8 M and each M by a tetrahedron of S. The alkaline earth sulfides MS (Mg, Ca, Sr, Ba) adopt the NaCl-type 6 6 structure (p. 242) as do many other monosulfides of rather less basic metals (M = Pb, Mn, La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Th, U, Pu). However, many metals in the later transition element groups show substantial trends to increasing covalency leading either to lower coordination numbers or to layer-lattice structures. Thus MS (Be, Zn, Cd, Hg) adopt the 4 4 zinc blende structure (p. 1210) and ZnS, CdS and MnS also crystallize in the 4 4 wurtzite modification (p. 1210). In both of these structures both M and S are tetrahedrally coordinated, whereas PtS, which also has 4 4... 

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