Materials Literature
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A cathodoluminescence detector on a V.G. Microscopes HB5 STEM has been used to form high-resolution cathodoluminescence images of single dislocations in natural type-IIb diamond. The cartridge and light-collection systems are described and stray-electron effects are discussed. The cathodoluminescence and transmitted-e…
A new class of nematic liquid-crystal storage effects with potential display applications is described. We have developed structures, produced by special surface alignment patterns, exhibiting bistable configurations. Switching between states has been demonstrated with both electric and magnetic fields. The movement o…
Formulation of radiative transition probabilities of 5 d 1 →4 f 1 of Ce 3+ and of 4 f 6 5 d →4 f 7 of Eu 2+ in a cubic crystal field is performed using pure 5 d and 4 f wavefunctions. The emitting state of Ce 3+ is 5 d ( T 2 ) or 5 d ( E ). The coupled states of the 4 f 6 ( 7 F ) core and 5 d ( t 2 or e ) are taken as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(dimethylphosphazene), (Me2PN)nPatty Wisian-Neilson and Robert H. NeilsonCite this: J. Am. Chem. Soc. 1980, 102, 8, 2848–2849Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980https://pubs.acs.org/doi/10.1021…
A detailed study of the critical magnetic fields of the superconducting layered compounds is reported and used to investigate the quasi-two-dimensional nature of these superconductors. The compounds studied include Ta${\mathrm{S}}_{2}$ and Ta${\mathrm{S}}_{1.6}$${\mathrm{Se}}_{0.4}$ intercalated with collidine, pyridi…
In this paper the recent Green's-function theory of Ramkrishnan and Tanaka for studying ferroelectric phase transitions in potassium dihydrogen phosphate (KDP)-type crystals using pseudo-spin-lattice coupled mode (PLCM) model has been extended to include the effect of phonon anharmonicity and to compare the calculated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of chromium(III) complexesA. D. Kirk and Gerald B. PorterCite this: J. Phys. Chem. 1980, 84, 8, 887–891Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980https://pubs.acs.org/doi/10.1021/j100445a020h…
Anodic characteristics of La 1 − x Sr x CoO 3 (with x = 0.2 and 0.4 ) electrodes were investigated in alkaline solutions. It was found that the catalytic activities for the oxygen evolution reaction are relatively high and that the activity of the electrode with x = 0.4 is higher than that of x = 0.2 . The secondary c…
Thermally induced deformations and stress resultants in symmetric laminated plates are analyzed. The method of M. Levy is used to study the transverse bending of a specially orthotropic laminate having two simply supported edges and subject to a temperature distribution that does not vary in a direction parallel to th…
The acid-base titration curves of hen egg-white lysozyme [EC 3.2.1.17] obtained by three groups (Sakakibara & Hamaguchi (1968) J. Biochem. 64, 613--619; Tanford & Roxby (1972) Biochemistry 11, 2192--2198; Pfeil & Privalov (1976) Biophys. Chem. 4, 23--32) were analyzed using the empirical formula of Linderstrøm-Lang. H…
Grain boundary dislocations and steps may have a major role in migration. The perfect grain boundary dislocations discussed in the present work can have steps at their cores and the step height depends on the dislocation and the boundary concerned. A model for migration is developed and it is correspondingly sensitive…
ABSTRACT Diagenetic transformation of clay minerals, zeolites and silica minerals in Cretaceous and Tertiary argillaceous rocks from deeply drilled wells in Japan were studied. Transformations of these minerals during diagenesis were as follows: in clay minerals, montmorillonite → montmorillonite‐illite mixed‐layer mi…
Abstract Chloride-, sulfate-, and perchlorate-exchanged forms of hydrotalcite have been prepared and their layer spacings determined after equilibration in hydrous atmospheres and after heat-treatments up to the temperature of decomposition in the range 300–400°C. The initial carbonate form of hydrotalcite and also br…
A simple analytical method is put forward in this paper, enabling one to extract quantitative information about an arbitrary energetic distribution of traps for current carriers from a single experimental space-charge-limited current-voltage characteristic. The applicability of the method is illustrated with computer-…
Abstract The thermal decomposition products that evolve from poly(vinyl chloride) (PVC), poly(vinylbromide) (PVB), poly(vinyl alcohol) (PVA), and poly(vinylacetate) (PVAc) were analyzed by direct pyrolysis in the ion source of a mass spectrometer (MS). Our results indicate that in both stages of the decomposition proc…
It is shown that the energy of electronic minority charge carriers injected into an electrolyte from an illuminated semiconductor electrode may be significantly greater than that predicted by previous models. The time constants for tunneling from the semiconductor states in the depletion region are evaluated by two me…
The use of a single extraction with dilute unbuffered silver-thiourea (AgTU) solution (0.01 M Ag+) for measuring exchangeable cations and the cation exchange capacity (CEC) of soils was compared with the conventional effective CEC method, which used N NH4OAc displacement for exchangeable “bases” (Ca, Mg, K, Na) and N…
Abstract Experiments providing multi‐point data on electron mean free paths vs. energy in pure materials have been reviewed for energies from 150 to 4000 eV. With the assumption that the simple equation λ= k E m can approximate the data, one obtains values of m between 0.53 and 0.80. Observations by ESCA of widely spa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical kinetics of salicylidenanilineP. F. Barbara, P. M. Rentzepis, and L. E. BrusCite this: J. Am. Chem. Soc. 1980, 102, 8, 2786–2791Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980https://pubs.acs.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR spectra of cellulose polymorphsR. H. Atalla, J. C. Gast, D. W. Sindorf, V. J. Bartuska, and G. E. MacielCite this: J. Am. Chem. Soc. 1980, 102, 9, 3249–3251Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 A…