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E-bok
PDF, Engelska, 201316 785 kr
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In the first part of this volume the nitrogen-containing compounds of molybdenum are described. The Mo-N system shows that M0 N and MoN are the stable nitrides. MOlybdenum 2 metal dissolves nitrogen to some extent but only at high temperatures. To get better insight into the reactions between nitrogen and molybdenum, the solubility, diffusion, adsorption and desorption phenomena, and ion bombardment are included in the section of the Mo-N system. M0 N has a large range of homogeneity toward lower nitrogen concentrations. The black 2 hexagonal MoN has only a narrow range of homogeneity. In addition some molybdenum compounds containing nitrogen and oxygen are known. The second part contains a full description of the compounds of molybdenum with fluorine. The fluorides MoF n with n ~ 2 are metastable while those with n = 3 to 6 are stable and have been observed in the Mo-F system. Pure MoF can exist without traces of oxygen, in co nt rast 3 to earlier assumptions. MoF was unambigously prepared and characterized in 1957. Its crystal 4 structure is still unknown. MoF is often contaminated with the oxide fluoride MoOF and it is s 4 difficult to remove. Even sm all amounts affect the properties of MoF . MoF , which is liquid at s 6 room temperature and solidifies to a "plastic" crystal modification below ca. 17SC, is the most investigated of all the molybdenum fluorides.
E-bok
PDF, Engelska, 20131 116 kr
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The present volume continues the description of the chemical reactions of eiemental tungsten started with "Tungsten" Suppl. Vol. A 7. It covers the reactions with the metallic elements from zinc to actinoids. The treatment includes phase diagrams, bulk reactions, and surface processes which again are of outstanding importance in most systems. The raader is referred to the introductory remarks on pp. X/XI. Frankfurt am Main Ernst Koch November 1987 Introductory Remarks Abbreviations In order not to overload the text, the following abbreviations are sometimes used without definitions in the present volume, in addition to the abbreviations usual in the Gmelin Handbook. a. c. alternating current AE Auger electron Auger electron spectroscopy(ic) or spectrum AES bcc body-centered cubic CPD contact potential difference counts per second cps d. c. direct current DTA differential thermoanalysis Fermi Ievel EF EI electron impact ELS electron energy loss spectroscopy or spectrum EMF, emf electromotive force fcc face-centered cubic FE field emission field electron (emission) microscope(ic) FEM FES field emission spectroscopy FIM field ion microscope(ic) F-N Fowler-Nordheim hcp hexagonal close-packed 6 L Langmuir=1·10- Torr·s LEED low energy electron diffraction monolayer ML PES photoelectron spectroscopy PSD photon-stimulated desorption RHEED reflection high energy electron diffraction room temperature RT SI secondary ion SIMS secondary ion mass spectrometry TDS thermal desorption spectroscopy(ic) or spectrum TE thermionic emission total energy distribution TED UHV ultra-high vacuum UPS ultra-violet photoelectron spectroscopy(ic) or spectrum XPS X-ray photoelectron spectroscopy(ic) or spectrum Gmelin Handbock WSuppl. Vol.
E-bok
PDF, Engelska, 20131 379 kr
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Häftad, Engelska, 2013
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This voLume continues the description of the physicaL properties of tungsten metaL and covers specificaLLy surface properties, eLectron emission, and fieLd evaporation. Tungsten surfaces are probabLy the most extensiveLy studied metaL surfaces. RecentLy, experimentaLists and theorists have focused their interest on the atomic structure, Lattice dynamics, and eLectronic properties of the W(100) surface. WhiLe the structure of the recon- structed Low-temperature surface is weLL estabLished, there are still unresoLved probLems concerning the structure at and above room temperature, the nature of the phase transition, and the driving force for the reconstruction. Other Low-index tungsten surfaces have been studied in much Less detail. There are numerous and partLy confLicting data on the surface energy, the seit-diffusion parameters, and the work function of singLe-crystaL and poLycrystaL tungsten surfaces. ELec- tron emission, which is of fundamentaL importance for many appLications, comprises therm- ionic, fieLd, photofieLd, and photoeLectric emission as weLL as emission induced by impinging eLectrons, atoms, or ions.Pioneering work in areas Like thermionic or fieLd emission is comprehensiveLy discussed. Very recent studies of vaLence-band and core-LeveL spectra moreover provide detaiLed information on intrinsic surface properties. FieLd evaporation phenomena are treated at the end of this voLume. Frankfurt am Main Woltgang HuisL November 1993 fable of Contents Page 1 Atomic Structure, LaHice Dynamies, and Electronic Structure of Tungsten Surfaces 1 1.1 W(100) ...1.1.1 Atomic Structure. Reconstruction and Relaxation Survey ...