A solid silaethene: isolation and characterization
The first reported solid silaethene, m.p. 95 °C, stable at room temperature under argon, but highly reactive in air has been isolated and characterized by i.r., n.m.r. and mass spectrometry.
Materials Literature
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Fast Breeder Reactors
This book describes the major design features of fast breeder reactors and the methods used for their design and analysis. The foremost objective of this book is to fulfill the need for a textbook on Fast Breeder Reactor (FBR) technology at the graduate level or the advanced undergraduate level. It is assumed that the…
Synthesis and X-ray structural characterization of the centred icosahedral gold cluster compound [Aul3(PMe2Ph)10Cl2](PF6)3; the realization of a theoretical prediction
The gold(I) complexes AuCl(PR3)(PR3= PPh3, PMePh2, and PMe2Ph) react with Ti(η-C7H8)2 to form a variety of cationic gold cluster complexes; single-crystal X-ray analysis of one of these, [Au13-(PMe2Ph)10Cl2](PF6)3, has confirmed a centred icosahedral geometry for the cluster, in agreement with an earlier theoretical p…
Agglomerate and Particle Size Effects on Sintering Yttria‐Stabilized Zirconia
The initial‐, intermediate‐, and final‐stage sintering of fine crystallite yttria‐stabilized zirconia was studied. Experiments were conducted on powder lots of differing agglomerate size and one specially prepared agglomerate‐free powder. Initial‐stage sintering kinetics were compared with a sintering study on larger…
Water structure and changes in thermal stability of the system poly(ethylene oxide)–water
The phase behaviour of aqueous solutions of poly(ethylene oxide), PEO, is analysed by means of a structural model of the system and a simple statistical-mechanical model based thereupon. The intention is to elucidate the structural questions involved in the water–PEO coupling and to gain some insight in possible conse…
Fluorimetry study of N-(1-pyrenyl)iodoacetamide-labelled F-actin. Local structural change of actin protomer both on polymerization and on binding of heavy meromyosin.
A fluorescent reagent, N-(1-pyrenyl)iodoacetamide, was conjugated to rabbit skeletal muscle actin at the site of the most reactive sulfhydryl group, and fluorescence characteristics (excitation and emission spectra, quantum yields, lifetimes) of the conjugate were investigated. Associated with polymerization of labell…
Normal mode determination in crystals
Abstract The group theoretical methods by which the symmetries of normal modes in crystals may be determined are outlined, and a series of tables are presented to facilitate rapid determination of the selection rules for vibrational transitions. Emphasis is placed on the method of nuclear site group analysis in which…
The Formation, Structure, and Properties of the Extracomplexes of Porphyrins
The results of studies on the extracomplexes of metalloporphyrins namely the conditions of their formation, structure, spectroscopy, kinetics, and thermodynamics, are considered. The bibliography includes 245 references.
Optical detection of EPR of recombination centres in YAG
Crystals of yttrium aluminium garnet (YAG) emit a broad luminescent band peaking at 270 nm under X-irradiation at 4K. Exploitation of the magneto-optical properties of this emission makes possible measurement of EPR spectra of an excited state of the emitting centres. It is suggested that at least three different cent…
Conduction bipolarons in low-temperature crystalline WO3-x
Conduction electrons in the low-temperature phase of crystalline WO 3-x (x>or approximately=0.0001) are found to be paired diamagnetically, forming bipolarons due to joint lattice distortion. They can be dissociated with light in a broad band of wavelengths peaked at 1.1 eV, as monitored by the appearance of W 5+ E…
Core level binding energies for the elements Hf to Bi (Z=72-83)
The binding energies of all core levels in the N and O shells for the elements Hf to Bi have been measured by means of electron spectroscopy. The binding energies obtained are compared to previously reported values.
Kristallstruktur und Farbe bei Perylen‐3,4:9,10‐bis(dicarboximid)‐Pigmenten
Abstract Es wird versucht, extreme Farbtonunterschiede bei Perylen‐3,4:9,10‐bis(dicarboximid)‐Pigmenten durch ihre Kristallstruktur zu erklären. Dabei werden drei schwarze Pigmente mit fünf entsprechenden roten verglichen. Das N,N′ ‐Di(2,6‐xylyl)perylen‐3,4: 9,10‐bis(dicarboximid) wird gesondert diskutiert.
The structure of the high-temperature solid electrolyte lithium sulphate at 908K
The structure of the high-temperature, plastic form of lithium sulphate has been determined from neutron powder diffraction data collected at 908K. The structure is face-centred cubic, a=7.07 AA with the SO 4 2- ion situated at the origin and the oxygen atoms rotationally disordered about the sulphur atom. The Li + io…
The decomposition of hydrogen peroxide catalyzed with BF3 etherate; the use of this initiation system in the preparation of HO‐terminated telechelic polymers and copolymers of butadiene
Abstract Kinetics of the catalyzed decomposition of hydrogen peroxide in the presence of BF 3 etherate were investigated, and the basic kinetic parameters used in the discussion of the mechanism of this reaction were determined. The system hydrogen peroxide‐BF 3 etherate was used in the initiation of the radical polym…
X-ray and thermostimulated luminescence of 0.9 ZrO2–0.1 Y2O3 Single Crystals
X-ray luminescence spectra of single crystals of composition 0.9 ZrO2-0.1 Y2O3 and 0.9 ZrO2-0.09 Y2O3-0.01 Ln2O3 (Ln = Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb) are obtained at room temperature. A wide structureless band of luminescence with a maximum at about 500 nm is found. Thermostimulated luminescence is investigat…
Oxygen-17 NMR and EPR studies of water exchange from the first coordination sphere of gadolinium(III) aquoion and gadolinium(III) propylenediaminetetra-acetate
The 17O NMR relaxation times, T1 and T2, for water in aqueous solutions of Gd(ClO4)3 and GdPDTA− and the EPR linewidths for the same complexes have been measured. These data are analyzed in terms of the Solomon-Bloembergen-Morgan equations for relaxation of a nucleus near a paramagnetic ion and McLachlan’s theory for…
New transfer-matrix method for low-energy-electron diffraction and other surface electronic-structure problems
A new transfer-matrix method is developed for low-energy-electron diffraction and other interface electronic-structure problems. This new procedure uses the waves incident on each layer as the basis for the transfer matrix. These waves are not singular at the plane of atoms, so that transfer can be done from one atom…
Electric-field depinning of charge-density waves in NbSe3
Measurements of the nonlinear conductivity in Nb${\mathrm{Se}}_{3}$ resulting from the high-temperature charge-density wave (CDW) have been made. The results show that the electronic properties of Nb${\mathrm{Se}}_{3}$ in the temperature regime where only one CDW exists are qualitatively the same as those in the the r…
X-ray-scattering study of the fast-ion conductorβ′′-alumina
The ion-ion correlations and a new crystal-structure determination of ${\ensuremath{\beta}}_{\mathrm{Na}}^{\ensuremath{'}\ensuremath{'}}$- and ${\ensuremath{\beta}}_{\mathrm{K}}^{\ensuremath{'}\ensuremath{'}}$-alumina reveal that the conducting ions are distributed between two independent sites instead of one given by…
Chemisorption geometry ofc(2×2)oxygen on Cu (001) from angle-resolved core-level x-ray photoemission
The x-ray photoelectron intensity of the $1s$ core level of adsorbed oxygen in the form of a $c(2\ifmmode\times\else\texttimes\fi{}2)$ overlayer on Cu (001) exhibits strong angular dependence due to final-state diffraction at low electron take-off angles. The azimuthal anisotropies of the intensity, measured as $\frac…