Results 251 to 260 of about 116,856 (306)

Supercrystal structures of polyhedral PbS nanocrystals

Journal of Colloid and Interface Science, 2011
The construction of supercrystals with non-spherical building blocks has attracted increasing attention due to their potential applications in the fabrication of novel devices. In this study, we report the large-scale preparation of dimension-controllable supercrystals of polyhedral PbS nanocrystals through a solvent evaporation approach.
Zhihui, Zhao, Junhu, Zhang, Fengxia, Dong, Bai, Yang   +3 more
openaire   +2 more sources

Structure and properties of PbS–polyacrylamide nanocomposites

Applied Physics A, 2005
A synthetic procedure for the incorporation of PbS nanoparticles in a polyacrylamide (PAM) matrix is introduced. The method is based on the simultaneous polymerization of the monomer and thermal decomposition of the dithiooxamide–lead complex. X-ray diffraction analysis revealed that the PbS nanoparticles have a sphalerite crystal structure (galena). A
Nair, PS, Radhakrishnan, T, Revaprasadu, N, Kolawole, GA, Luyt, AS, Đoković, Vladimir   +5 more
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Pressure-induced orthorhombic structure of PbS

Journal of Physics: Condensed Matter, 2010
The pressure-induced crystal structure of lead sulfide (PbS) above 2.2 GPa has been studied with single-crystal x-ray diffraction in a diamond anvil cell at room temperature. It has been found to be twinned and of the TlI type (Cmcm, Z=4), in which the Pb atoms are surrounded by seven S atoms in a capped trigonal prism coordination.
Andrzej, Grzechnik, Karen, Friese
openaire   +2 more sources

Structure and growth of epitaxial Pb on Si(111)

Physical Review B, 1992
A detailed study on the structure, growth, and morphology of epitaxial Pb layers on Si(111) is presented. Grey et al. already determined the structures of the Si(111)(7 x 7)-Pb and Si(111)(unroofed radical 3BAR x unroofed radical 3BAR)R 30-degrees-Pb(beta) monolayer phases with grazing-incidence x-ray diffraction.
WEITERING, HH, HESLINGA, DR, HIBMA, T
openaire   +3 more sources

Structure change of Pb melt

Physics Letters A, 2006
Abstract Using viscometer, densitometer, magnetic susceptibility device, DSC and X-ray diffractometer for high temperature (XRD), the Pb melt has been investigated between 800–1200 K. Anomalous changes in the physical properties were found near the same temperature. X-ray diffraction shows that the size of clusters in the low temperature zone is much
Jixin Hou, Hongxuan Guo, Jianjun Sun, Xuelei Tian, Chengwei Zhan, Xubo Qin, Xichen Chen   +6 more
openaire   +1 more source

Structure and properties of PbS films

Journal of Alloys and Compounds, 2013
Abstract The crystal structure of thin lead sulfide (PbS) films prepared by chemical deposition from aqueous solutions on a glass substrate is studied by X-ray diffraction analysis. It is established that the PbS films studied have a cubic (space group Fm 3 ¯ m ) D03-type crystal structure different from the B1-type structure ...
S.I. Sadovnikov, A.I. Gusev
openaire   +1 more source

The electronic band structure of PbS

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1953
Abstract The cellular method has been applied to the determination of electronic wave functions of the Bloch type in PbS. In each cell ψ is expanded in terms of ‘Kubic harmonics', and a table of these functions (for a NaCl type of lattice) for prominent points in momentum space is included. An attempt has been made to establish a self-
Bell, D. G., Hum, D. M., Pincherle, L., Sciama, D. W., Woodward, P. M.   +4 more
openaire   +2 more sources

Electrical Structure of PbS Films

Physical Review, 1960
The electrical properties of chemically deposited lead sulfide films were investigated as a function of frequency from direct current into the microwave range. Conductivity and Hall mobility measurements were made on both the dark and the photoexcited carriers. The dark conductivity is independent of frequency below 100 Mc/sec.
D. P. Snowden, A. M. Portis
openaire   +1 more source

Josephson effect in a planar Pb-Sn-Pb proximity structure

Solid State Communications, 1975
Abstract Reliable S(lead)-N(tin)-S(lead) junctions using an original planar geometry have been studied. Above the critical temperature of tin d.c. and a.c. Josephson behaviour have been observed for short enough tin film. We also report measurements of the supercurrent temperature dependence in agreement with a simplified proximity effect description.
J.P. Romagnan, A. Gilabert, J.P. Laheurte, J.C. Noiray, E. Guyon   +4 more
openaire   +1 more source

An STM study of the step structure of Pb(110) and Pb(111)

Surface Science, 1995
The (110) and (111) surfaces of lead are investigated by scanning tunneling microscopy. They are atomically resolved with corrugations of 0.1A and 0.6A respectively. The STM images allow conclusions about the motion of the atoms at step edges and step step interaction.
S. Speller, W. Heiland, A. Biedermann, E. Platzgummer, C. Nagl, M. Schmid, P. Varga   +6 more
openaire   +1 more source