Results 231 to 240 of about 105,758 (267)

Structure and Composition of Polished PbS Surfaces

Crystal Research and Technology, 1986
Abstract{100} surfaces, produced from sublimation grown PbS single crystals by cutting, mechanical and chemical polishing, were characterized with regard to topography, structure and chemical composition. For this purpose, some methods independent from another were used, for instance profile measuring, dislocation etching, X‐ray rocking‐curves, RHEED ...
Y. Tomm, A. Engel, A. M. Gaskov
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Crystal structure of `Pb'-1234 superconductor

Physica C: Superconductivity, 1998
Abstract A sample with a nominal composition of Pb:Sr:Ca:Cu=5.0:28.0:27.0:40.0 has been prepared by using a high-pressure synthesis technique. A micro-composition analysis by an energy dispersive X-ray (EDX) measurement indicated that the ratio of cations in the main phase was Pb:Sr:Ca:Cu=5.5:24.6:27.9:41.4.
X.-J Wu, T Tamura, S Adachi, T Tatsuki, K Tanabe   +4 more
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Pb(II)-Carboxylate Structure and Reactivity: from Pb(II) Coordination Compounds to PbS Colloidal Nanocrystals

Inorganic Chemistry
Lead(II)-carboxylates are important precursors for preparing Pb-based semiconductor nanocrystals (NCs). However, the atomic structure of common Pb-carboxylate precursors (e.g., Pb-oleate) remains elusive. Here, we use a rigid yet soluble 4-tert-butylbenzoate (TBBA) as a model ligand to probe the binding and reactivity of Pb-carboxylates.
Joshua O. Gibson, Robert A. Brown, Fuyan Ma, Saryvoudh A. Mech, Chenjie Zeng   +4 more
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Structure of liquid K-Pb alloys

Physica B+C, 1987
The structure factors of liquid Pb, Ko.zsPbo 75r KO 6sPbo 35 and Ko.80Pbo 2ohave been measured by means of neutron diffraction. The main peaks of the structure factorsof the alloys are preceded by a pre-peak which is most pronounced in Ko,50Pbo This prepeakindicates that there is considerable orderingin the alloys, although there is also evidencefor a ...
Reijers, HTJ, van der Lugt, W, van Dijk, C   +2 more
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Electronic Structure of PbS, PbSe, and PbTe

physica status solidi (b), 1970
AbstractThe electronic band structures of PbS, PbSe, and PbTe have been calculated using the relativistic Green's function method. The choice of a relativistic atomic potential for Pb and of nonrelativistic atomic potentials for S, Se, and Te inthe muffin‐tin spheres results in similar band models for the lead salts.
H. Overhof, U. Rössler
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The structure of Bacillus subtilis bacteriophage PBS 1

Journal of Ultrastructure Research, 1967
The structure of bacteriophage PBS 1 has been studied by electron microscopy using negative staining. Two unique structures were observed: several large helical tail fibers, and a number of “contraction fibers” seen only on contracted particles. The tail sheath was seen at several different stages of contraction. Approximate dimensions of the phage are
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The crystal structure of the superconductor with Pb substitution

Journal of Physics: Condensed Matter, 1997
Pb-doped superconductors with x = 0.0 to 0.50 and increment steps of 0.1 have been synthesized. For x = 0.30, the sample has the highest superconducting transition temperature, (the zero-resistance temperature), and (the diamagnetic onset temperature) (results given by Shao H M, Lam C C, Fung P C W, Wu X S, Du J H, Shen G J, Chow J C L, Ho S L, Hung
X S Wu, S S Jiang, H M Shao, F M Pan, N Xu, Mao Zhiqing, Zuo Jian, Zhang Yuheng   +7 more
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LEED structure analysis of Pb(110)

Surface Science, 1990
Abstract The multilayer relaxation of Pb(110) was investigated by LEED. Data were taken at 130 and 300 K using a computer controlled video based technique. They were analyzed by full dynamical calculations. A quantitative comparison between experiment and theory via the Pendry R -factor confirms the strong contraction of the first layer spacing ...
U. Breuer, K.C. Prince, H.P. Bonzel, W. Oed, K. Heinz, G. Schmidt, K. Müller   +6 more
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New Pb–Pb bonds: syntheses and molecular structures of hexabiphenyldiplumbane and tri(trisbiphenylplumbyl)plumbate

Chem. Commun., 2004
Reaction of lead(II) chloride with biphenylmagnesium bromide yields Bp(3)Pb-PbBp(3) and [(THF)(3)Mg(mu-Cl)(3)Mg(THF)(3)][Pb(PbBp(3))(3)](Bp = biphenyl), which, upon single crystal X-ray crystallographic analysis, reveals an interesting variation of Pb-Pb bond distances.
Yuzhong, Wang, Brandon, Quillian, Pingrong, Wei, Xiao-Juan, Yang, Gregory H, Robinson   +4 more
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PbS/PbSe structures with core–shell type morphology synthesized from PbS nanocrystals

Nanotechnology, 2007
Colloidal PbS/PbSe nanostructures with core-shell type morphology have been synthesized for the first time using a simple chemical procedure where template PbS nanocrystals (NCs) were treated with Se solution in tributylphosphine at elevated temperature. The Se-coated PbS NCs were structurally and optically characterized by high resolution transmission
Dmitry S, Koktysh, James R, McBride, Sriram K, Dixit, L C, Feldman, Sandra J, Rosenthal   +4 more
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