Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Basis for Miscibility in Polyester-Polycarbonate BlendsC. A. Cruz, J. W. Barlow, and D. R. PaulCite this: Macromolecules 1979, 12, 4, 726–731Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs.acs.o…
Abstract The adsorption of Mn 2+ on two samples of powdered calcite with different surface areas has been studied using atomic absorption and electron spin resonance spectroscopy to investigate the solution and mineral phases. Chemisorption of Mn 2+ on CaCO 3 surfaces lowered the solubility of Mn 2+ below the level ex…
Metal catalysts are technologically very important. Moreover, these materials are intriguing systems for scientific investigation. In general, metal catalysts are highly dispersed materials, i.e., materials with very high surface areas. The study of these materials with chemical probes including chemisorption and sele…
Electrons incident on a crystal surface can be temporarily trapped in surface states at energies above the vacuum level. These temporary or nonstationary surface states are observed as narrow fluctuations of elastic scattering intensity with respect to variation of electron energy and incidence direction. The scatteri…
The first complex to contain the bidentate ligand [H N O]2− has been isolated and characterized. MoVI oxo anions react with hydroxylamine and terpyridine (tpy)to give a yellow cation (1) which can be isolated as the perchlorate. The red neutral complex (2) is formed reversibly from (1) and cyanide.
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
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 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…
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,…
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…
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…
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…
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…
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.…
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…
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…
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…
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…
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…
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…