Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular structure on mesomorphism. 12. Flexible-center Siamese-twin liquid crystalline diesters - a "prepolymer" modelAnselm C. Griffin and Thomas R. BrittCite this: J. Am. Chem. Soc. 1981, 103, 16, 4957–4959Publication Date (Print):August 1, 1981Publication Hist…
Five mesomorphic phases are described in several disc-like liquid-crystals. They are hexalkanoyloxy benzenes, triphenylenes or truxenes, hexa-alkoxy triphenylenes, hexa-benzoates of triphenylene. Several of these compounds exhibit a complex polymorphism. Informations on the structures of these phases have been obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of nickel-molybdenum-.gamma.-aluminum oxide catalysts by x-ray photoelectron and Raman spectroscopy. Comparison with cobalt-molybdenum-.gamma.-aluminum oxide catalystsP. Dufresne, E. Payen, J. Grimblot, and J. P. BonnelleCite this: J. Phys. Chem. 1981, 85, 16, 2344–235…
The dc linear electro-optic effect and the x-ray crystal structure of the organic molecular solid 2-methyl-4-nitroaniline (MNA) have been studied. Of two crystal orientations measured, one polar orientation was found to have an exceptionally large figure of merit for electro-optic phase retardation, comparable to that…
This review covers results of recent O.D.M.R. measurements of recombination processes in layered semiconductors, II–VI compounds, at dep traps and in amorphous compounds, and includes consideration of experimental aspects.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical treatment of pyrolytic carbon fiber electrodesF. G. Gonon, C. M. Fombarlet, M. J. Buda, and J. F. PujolCite this: Anal. Chem. 1981, 53, 9, 1386–1389Publication Date (Print):August 1, 1981Publication History Published online1 May 2002Published inissue 1 August…
Article The crystal structure of the 11 Ä natural tobermorite Ca2.25[Si3O7.5(OH)1.5]·1H2O was published on August 1, 1981 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 154, issue 1-4).
"Electromagnetic Theory of Gratings." Optica Acta: International Journal of Optics, 28(8), p. 1030
Abstract Raman spectra of anhydrous crystalline samples of all of the lanthanide orthophosphates (with the exception of PmPO 4 ) have been obtained. These data were interpreted in a systematic manner based on the known structures of these compounds. Assignments and correlations have been made for many of the observed…
The defect chemistry of polycrystalline has been studied by means of the equilibrium electrical conductivity as a function of temperature, oxygen activity, Sr/Ti ratio, and impurity additions. Reduction, excess , and acceptor impurities all contribute to the oxygen vacancy content and their effects are therefore highl…
K C Mao and W Hwang 1981 Oxford: Pergamon xvi + 663 pp price £50 This seven-chapter book reviews charge transport, carrier injection, photoelectronic processes and luminescence in semiconductors and insulators. The subtitle reference to organic semiconductors applies to the first chapter on charge transport and the fi…
Optical properties of small dielectric spheroids with or without adsorbed molecules are studied theoretically. Expressions for the absorption line shapes, the radiative and nonradiative decay rates, and quantum yields are derived. In the case of a molecule near a spheroid the magnitudes differ dramatically from the co…
Data concerning the thermal decomposition of lanthanide, yttrium, and scandium oxalates and carbonates are surveyed. The complexity of the process, the large number of stages involved, and the dependence of the composition of the intermediates in the thermal transformations on the experimental conditions is noted. Cer…
The authors investigate the temperature renormalisation of the magnetic excitations in FeCl 2 , where, owing to the low value of the spin, a careful treatment of its large anisotropic effects appears to be necessary. A self-consistent renormalised theory which is not affected by kinematic inconsistencies is presented…
We report the microwave conductivity of a single crystal of the superionic conductor hollandite (${\mathrm{K}}_{1.54}$${\mathrm{Mg}}_{0.77}$${\mathrm{Ti}}_{7.23}$${\mathrm{O}}_{16}$). The charge carriers are potassium ions which propagate along channels. Transport is determined by thermally activated hopping of the po…
The melting behaviour for finite size clusters is calculated in the framework of positional disorder theory. It is shown that the 'melting anomalies' observed in a variety of absorbate systems, such as H 2 O in porous Al 2 O and N 2 or Ar on TiO 2 , are consistent with the melting characteristics of small clusters. In…
X-ray photoelectron spectra of Ag, O, and Cs and quantum yield distributions from surfaces prepared by evaporating Cs onto Ag oxidized in ultrahigh vacuum have been measured. The structure of this surface determined from these measurements consists of silver particles dispersed in a matrix of ${\mathrm{Cs}}_{2}$O with…
Abstract A formal derivation of the sink strengths to be used in point defect rate theory is presented. Previous models that have been invoked for the approximate evaluation of these parameters are discussed. It is shown that the effective medium approach, as introduced earlier by us, constitutes the best available ap…
The magnetic and crystallographic nature of the compounds NiMn1−tTitGe (0 ≦ t ≦ 1) are studied by X-ray and neutron diffraction and magnetometric measurements. It is shown that the solid solutions arise for 0 ≦ t ≦ 1, with the crystal structure of the NiTiSi type. A magnetic phase diagram is constructed: for 0 ≦ t ≦ 0…
A theory of the fractional glow technique (FGT) for an arbitrary heating regime and first-order recombination kinetics is developed. In order to describe a trap distribution function (TDF) its characteristics: (i) the mean activation energy, (ii) the mean frequency factor, (iii) the recombination intensity, (iv) the F…