Materials Literature
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Metal-free and ZnTPP complexes exhibit both fluorescence and low temperature phosphorescence, MnIITPP shows only low temperature phosphorescence while NiIITPP is non-luminescent. The absorption spectra show that there is little interaction between the metal and the porphyrin π-system so that the excited states can be…
The first and basic step in gas release is single gas atom diffusion. The lattice location of rare gas atoms in the UO2 lattice and the mechanism of this diffusion process are discussed. Trapping of single gas atoms is important for out-of-pile laboratory work and helps to explain much of the scatter in the reported d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered Phase Formation in Concentrated Hydroxpropylcellulose SolutionsRita S. Werbowyj and Derek G. GrayCite this: Macromolecules 1980, 13, 1, 69–73Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://…
Available data on the refractive index and its temperature derivative for alkaline earth halides were exhaustively surveyed, compiled, and analyzed. The most probable values of the refractive index at 293 K for the transparent region were generated for the materials for which experimental data were sufficiently abunda…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in transition metal complexes. 12. Calculation of cluster exchange coupling constants with the X.alpha.-scattered wave methodA. P. GinsbergCite this: J. Am. Chem. Soc. 1980, 102, 1, 111–117Publication Date (Print):January 1, 1980Publication History Publishe…
Abstract A prediction technique for gas permeability from polymer structure has been developed on the basis of a specific free volume diffusion theory. In this theory, the free volume available per unit mass in a polymer structure controls the rate of gas diffusion and, hence, its rate of permeation. The smaller this…
The effect of grain orientation on the dielectric properties of hot-forged ferroelectric Bi 4 Ti 3 O 12 ceramics has been investigated and the properties are compared with ordinarily fired ones. The degree of grain orientation f calculated from X-ray diffraction patterns is found to be as large as 0.95. The temperatur…
Preface 1. The structure of particle-hardened alloys 2. Yield and work-hardening in the absence of recovery 3. Mechanisms of fracture in two-phase materials 4. Micromechanisms at elevated temperatures References Index.
The concept of appropriately combining two or more different polymers to obtain a new material system with the desirable features of its constituents is not new. Over the years, numerous systems based on the chemical combination of different monomers through random, block, and graft copolymerization methods have been…
Superconductivity has been observed by resistive measurements in the quasi-one dimensional organic conductor di-(tetramethyltetraselenafulvalene)-hexafluorophosphate, (TMTSF)2PF6 under a hydrostatic pressure of 12 kbar with a transition temperature of 0.9 K. The effect of magnetic fields perpendicular to the chain axi…
Several common modes of crystal growth provide particularly simple and elegant examples of spontaneous pattern formation in nature. Phenomena of interest here are those in which an advancing nonfaceted solidification front suffers an instability and subsequently reorganizes itself into a more complex mode of behavior.…
Abstract In the years 1930—1950 clay mineral identification involved mainly a combination of X-ray powder diffraction and chemical analysis with some assistance from other techniques, notably differential thermal analysis. In the period 1950—1970 additional procedures have emerged including infrared analysis, electron…
Abstract We extend a method devised by Lord Rayleigh to enable the calculation of the transport properties of circular cylinders in square and hexagonal arrays. The theory is confirmed by measurements on arrays of perfectly conducting cylinders, and also is compared with asymptotic formulae due to Keller (1963) and O’…
The kinematic inconsistencies for the Hartree-Fock magnon energy renormalisation in a ferromagnet with uniaxial anisotropy are shown to be eliminated by taking into account additional anisotropy terms present in the second-order self-energy.
A programme of elastic neutron-diffraction experiments has been undertaken to derive (and compare) atomic distribution functions, with high spatial resolution, for the antiferroelectric perovskites SiTiO 3 , KMnF 3 , RbCaF 3 and CsPbCl 3 in their cubic phase. The study of cubic CsPbCl 3 is presented. Data were collect…
The energy spectrum and wave functions for a particle in periodic potentials with incommensurate periods are obtained analytically and reduced to specific phase trajectories. The spectrum is of the devil's-stairs type. States may be extended and localized, separated by mobility edges. These results are applicable to i…
Abstract Brillouin scattering spectra, with a single mode argon-ion laser and triple-pass Fabry-Perot interferometer, have been measured for natural biological fibres and for films of synthetic polypeptides. For wet unstretched rat tail collagen, with the scattering vector parallel and perpendicular to the fibre axis,…
It is shown that the C 1s core-electron line shape of graphite in photoemission is determined by an excitonic state near the Fermi energy in the hole-state density of states.Received 14 September 1979DOI:https://doi.org/10.1103/PhysRevLett.43.1896©1979 American Physical Society
Anomalous behaviors are found in thermodynamic properties of FeNi (f.c.c.) alloys measured by the solid state electrolyte cell method at 900 to 1300 K. The alloys containing 20 to 50 at% Ni seem to have a tendency to split into two f.c.c. phases even at high temperatures. This is consistent with the fact that the com…
Silicon crystals containing up to 1015 cm−3 of „oxygen donors”︁ are investigated by electrical and infrared spectroscopic measurements. The results obtained can be understood phenomenologically by the occurrence of several species of doubly charged donors, whose excited states can be fairly well described by the effec…