Chemical vapour deposition
Various aspects are covered including the basic CVD process, the range of materials produced, the chemistry of CVD, properties of CVD deposits, comparison with other coating techniques, applications and future developments
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Debye–Edwards electron recombination kinetics
The decay of recombination luminescence intensity I with time t, given by the Debye–Edwards law I ∝ t−m, with m?1 and time independent, applies to Coulombically correlated charge pairs in rigid low-dielectric media. For observation times much greater than preparation times it is remarkably successful, e.g., for a rang…
Nonlinear magnetization waves of an antiferromagnet
Nonlinear magnetization waves are investigated in antiferromagnets with anisotropies of the “easy axis” type in an external magnetic field. Solitary waves are found, and the motion of the domain boundary at a moderate velocity is investigated. Exact solutions are found which describe the interaction of the nonlinear s…
Neutron Diffraction Study of the Structure of Cubic CsPbBr3
The Debye-Waller factor of cubic CsPbBr 3 was investigated by neutron diffraction technique at 152°C. The perovskite structure model with anisotropic thermal vibrations can explain the characteristics of the thermal behavior of this substance, which turned out to be essentially the same as that of CsPbCl 3 ; that is,…
X-ray photoelectron spectra of N-methyltetraphenylporphyrins: evidence for a correlation of binding energies with metal-nitrogen bond distances
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of N-methyltetraphenylporphyrins: evidence for a correlation of binding energies with metal-nitrogen bond distancesDavid K. Lavallee, John Brace, and Nicholas WinogradCite this: Inorg. Chem. 1979, 18, 7, 1776–1780Publication Date (Print):July 1, 1…
Distortions of the coordination polyhedron in high-spin manganese(III) complexes. 3. Crystal and molecular structure of .gamma.-tris(acetylacetonato)manganese(III): a tetragonally elongated octahedral form
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistortions of the coordination polyhedron in high-spin manganese(III) complexes. 3. Crystal and molecular structure of .gamma.-tris(acetylacetonato)manganese(III): a tetragonally elongated octahedral formB. Ray Stults, Robert S. Marianelli, and Victor W. DayCite this: Inorg…
`Polar flattening': non-spherical effective shapes of atoms in crystals
An examination of the nearest non-bonded interatomic distances found in crystals shows that where the two atoms are each covalently bound to only one other atom they exhibit non-spherical effective shapes. Such atoms behave as if flattened at their poles. Despite the large number of crystal structures now known in det…
Planar Tetracoordinate Silicon
The first compound found to contain planar tetracoordinated silicon is the orthosilicic ester (2). In contrast, the bondilg geometry of the central atom of the analogous orthocarbonic ester deviates only slightly from a tetrahedron. Quantum mechanical studies [e.g. on the model compound (3)] showed that planar tetraco…
Analysis of solid‐solid reactions: A review
Abstract This paper reviews some important aspects of the analysis of solid‐solid reactions which include: fundamental considerations, experimental techniques, analysis of pellet‐pellet reactions, analysis of mixed powder reactions, role of the gas phase, and reactor design. Illustrations are given wherever necessary.…
Densities of SiO 2 ‐Al 2 O 3 Melts
The densities of binary aluminosilicate melts were measured X‐radiographically as a function of Al 2 O 3 , concentration between 1800° and 2000°C. Within this temperature range, the density curves vary linearly and are parallel from fused SiO 2 to ≊30 to 45 mol% Al 2 O 3 , depending on the temperature. At higher Al 2…
Analysis of Field‐Assisted Binary Ion Exchange
A differential equation was derived for ionic migration in a system with two mobile ions. Stationary solutions were obtained for the case where the slower ion follows the faster, which reduce to those obtained when diffusion is ignored. When the faster ion is “behind” the slower no stationary solutions are possible, b…
Syntheses and electronic structures of decamethylmanganocenes
The syntheses of [(CS(CH3}S}2Mn]PF6' (CS(CH3}S}2Mn, and Na [(C S (CH 3 ) S'2Mn] c are described.Magnetic susceptibility, infrared, electrochemical, NMR, and reactivity studies suggest the formulation of these complexes as low spin 16-, 17-, and 18electron planar metallocences.EPR spectra of the neutral complex are con…
Structural Properties of Calcium Silicate Pastes: II, Effect of Curing Temperature
The chemical and physical properties of C 3 S pastes cured at 4°, 25°, and 65°C were investigated. The 65°C paste had lower H 2 O surface area and larger capillary pore volume than the 25°C paste. The structure of the gel in the 4°C paste changes markedly with increased hydration. These changes were reflected in an in…
Poly(α-methylene-γ-butyrolactone) Synthesis, Configurational Structure, and Properties
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(α-methylene-γ-butyrolactone) Synthesis, Configurational Structure, and PropertiesMurali K. AkkapeddiCite this: Macromolecules 1979, 12, 4, 546–551Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs…
Transformation Enthalpies of the TiO 2 Polymorphs
The enthalpies of transformation of pure, well‐characterized samples of brookite and anatase to rutile were determined by solution calorimetry in a 3Na 2 O·4MoO 3 melt at 971 ±2 K. The experiments gave the following results: brookite→rutile, ΔH° 971 = ‐0.17±0.09 kcal mol −1 ; anatase → rutile, ΔH° 971 = ‐0.78±0.20 kca…
The Kinetics of Oxidation of Zircaloy‐4 in Steam at High Temperatures
The kinetics of oxidation of Zircaloy‐4 in steam were examined under isothermal conditions from 900° to 1500°C. Rate curves describing the growth of the reaction product layers, oxide‐ and oxygen‐stabilized alpha, were obtained at 50°C intervals under carefully defined and documented experimental conditions. The early…
Fundamental Aspects of Rubber Adhesion to Brass-Plated Steel Tire Cords
Abstract During the past several years the fundamental knowledge of the processes which lead to rubber-brass bond formation and to bond degradation has increased considerably. As a result of the application of new instrumental techniques to the study of the rubber-brass interface it has been established that the brass…
The description of the smectic A and C phases and the smectic A–C phase transition of TCOOB with a diffuse-cone model
A previous paper demonstrated that the orientational disorder present in all smectic A phases causes most molecules to make fairly large angles with the normal to the smectic plane. Thus, the molecular directions form a diffuse cone around the layer normal. It is now argued that even the preferred directions of the mo…
A hopping model for activated charge transport in amorphous silicon
Abstract A variable‐range hopping model is examined for transport in a band tail. For an exponential density of states the difference of the activation energies of conductivity and thermoelectric power, Δ E , is essentially determined by the steepness of the tail. Δ E varies slowly with tempera ture and depends little…
Studies of supported nickel catalysts by x-ray photoelectron and ion scattering spectroscopies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of supported nickel catalysts by x-ray photoelectron and ion scattering spectroscopiesMilton. Wu and David M. HerculesCite this: J. Phys. Chem. 1979, 83, 15, 2003–2008Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue…