Materials Literature
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Ein allgemeines Strukturprinzip für organische Verbindungen, die zur zweistufigen Elektronenübertragung befähigt sind, geht aus der folgenden Reaktionssequenz hervor: Dabei können ein oder beide X durch Y⊖ ersetzt sein. In diesen Systemen besitzt der radikalische Partner oft sehr große thermodynamische Stabilität. Wah…
Abstract A new, fast, and simple method based on size exclusion chromatography permits determination of the volumes of open and closed pores of rigid solids such as silica or porous glasses, together with the specific surface and the pore‐size distribution for pore diameters ranging from 10 to 4000Å. The results are i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure and redox properties of the clusters [Ru3O(CH3CO2)6L3]n+John A. Baumann, Dennis J. Salmon, Stephen T. Wilson, Thomas J. Meyer, and William E. HatfieldCite this: Inorg. Chem. 1978, 17, 12, 3342–3350Publication Date (Print):December 1, 1978Publication Hist…
Some dielectric materials with large densities of low-mobility charge carriers show an anomalous low-frequency dispersion of the real and imaginary components of the complex dielectric permittivity, both varying as ω n−1 , with n close to or equal to zero. This behaviour is likely to be found in any dielectric materia…
La crisis de la energía, que tomó gran importancia a partir de 1973, ha originado la aceleración de estudios y posibilitado el desarrollo de otras fuentes alternativas del petróleo. El aprovechamiento de la energía latente que tienen algunos materiales volcánicos, o subproductos de procesos industriales (escorias side…
Para apreciar la acción física de microfisuración que experimentan los hormigones, cuando se encuentran sometidos a esfuerzos de compresión, se emplean en la actualidad diversas técnicas, siendo las más utilizadas la prospección radiográfica, los métodos fotoelásticos, y la observación mediante microscopía.
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El Pliego de Prescripciones Técnicas Generales para la Recepción de Cementos (RC-75), Decreto 1.064/1975 de 23 de mayo de 1975, publicado en los B.O.E. núms. 206 y 207, de fechas 28 y 29 de agosto, respectivamente, del mismo año, incluye la clasificación de los cementos, las prescripciones relativas a las característi…
A theory is presented in which the elimination of charging artefacts on uncoated insulating surfaces in the scanning electron microscope by a low-pressure ambient gas is taken to be due to ionisation of the gas. Curves of ion current against ionising field calculated from a model of gas neutralisation give good agreem…
We extend the scope of the Mueller calculus to parallel that established by Jones for his calculus. We find that the Stokes vector S of a light beam that propagates through a linear depolarizing anisotropic medium obeys the first-order linear differential equation dS/dz = mS, where z is the distance traveled along the…
A study of the electrical conductivity of the halogen doped transpolyacetylene system, (CH)x, is reported. When films of trans- (CH)x are exposed to chlorine, bromine, or iodine vapor, uptake of halogen occurs; and the conductivity increases markedly, over eleven orders of magnitude in the case of iodine. The behavior…
Abstract Raman spectra of anatase have been observed in natural and synthetic crystals. Both crystals show the same spectral features. The Raman band occurring at 516 cm −1 at room temperature is split into two peaks centred at 519 cm −1 and 513 cm −1 at low temperature (73 K). The six Raman active fundamentals predic…
B D Cullity London: Addison-Wesley 1978 pp xii + 555 price £16.50 This is the second edition of a book concerned with the theory and application of x-ray diffraction to polycrystalline materials in particular. The first edition is an established text for many metallurgists, physicists and chemists interested in orient…
For pt.II see ibid., vol.10, p.3051 (1977). Uses computer simulation to study the evolution of the time-dependent energy current J(t) for a vacancy in a model FCC system. In view of the problems arising in the thermal-equilibrium calculation of J(t), the simulation is performed at zero temperature, using the augments…
It is shown that the main features of the electronic structure of transition metal layered dichalcogenides can be calculated in a simple ab initio atomic orbital framework. Examples from Groups IV, V and VI of the transition series are considered.
Abstract The interaction of oxygen and nitric oxide with clean aluminium surfaces has been investigated by X-ray photoelectron spectroscopy. Studies have been in the main confined to the temperature range 80–290 K and pressure range 10-6–10-2 Pa. The Al(2p) level is shown to exhibit a shifted component at a binding en…
A comparison is made between various microsectioning techniques for radiotracer studies of self-diffusion in silver. Previous investigations by various groups were made with the help of chemical and electrochemical microsectioning techniques. In the present work ion-beam sputtering is applied to the sectioning of silv…
The thermoluminescence (TL) of heated amorphous ZrO2, doped by Ti, Th, U, Nb, Dy, excited by 253.7 nm or X-radiation is investigated. Six main peaks are observed at 100, 135, 190, 245, 285, and 385 K and their activation energies determined by four methods. It is shown that most traps obey Curie's model, and that the…
Optical-absorption spectra of Ca${\mathrm{F}}_{2}$: Co x-irradiated at 80 and 300 K are reported. Room-temperature x-irradiated crystals show five bands with peaks at 250, 295, 545, 715, and 780 nm which are associated with a Co-related defect. Irradiation at 80 K produces some bands at 240, 280, and 535 nm which are…