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Plastic deformation processes in oriented polyethylene are investigated by the X-ray method, and changes in texture produced by transverse compression are interpreted in terms of twinning, slip and phase transformation. The crystal structure of the new form produced by the phase transformation is determined, and the u…
Abstract Impurity hopping conduction in polar lattices and amorphous substances is investigated by application of the canonical transformation of the small polaron theory. In the case of acoustic coupling only, the results of Miller and Abrahams and Gosar for one‐phonon processes are recovered and compared with the co…
Carbon and graphite handbook , Carbon and graphite handbook , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Abstract The interaction of point defects, which are described by force multipoles, is treated using elasticity theory. Explicit expressions for the interaction energy are derived for elastically isotropic materials. For defects with cubic symmetry in f.c.c. metals, the lattice theory values derived for a special isot…
The ZrO 2 ‐HfO 2 system was investigated by metallo‐graphic, X‐ray diffraction, and microprobe analysis using are‐melted samples which had been annealed and quenched. The monoclinic‐tetragonal inversion was investigated by DTA and high‐temperature X‐ray diffraction analysis. Results reveal that zirconia and hafnia are…
E. K. Barefield, D. H. Busch and S. M. Nelson, Q. Rev. Chem. Soc., 1968, 22, 457 DOI: 10.1039/QR9682200457
The dependence of the emission spectra on compositional variations has been studied in binary alkaline earth orthosilicate systems activated by divalent europium. Isotherms at 1200°C were run in the systems ( i ) , ( ii ) , and ( iii ) . Phosphors produced in the system were considerably more efficient than those in e…
Solid solutions of BiFeO3 with PbTiO3, PbTi0.5Zr0.5O3, and PbZrO3 were prepared. The crystallographic data on these solutions, which are basically perovskitic, are given. The dielectric constants of the materials were determined at a frequency of 0.53 GHz and at temperatures up to 800°C. Dielectric Curie points were f…
Contents: Introduction to testing. The elements of statistics. The selection of samples for testing. Moisture relations and testing. Fibre dimensions and quality. Yarn dimensions. Fabric dimensions and properties. The tensile testing of textiles. Evenness testing. Miscellaneous testing instruments. Conclusion. Subject…
The crystal structure of the β-polymorph of copper phthalocyanine has been determined from three-dimensional X-ray diffraction data. A total of 1691 structure amplitudes was used in the refinement which resulted in R= 7·3% and standard deviation of bond lengths of 0·005 Å. The structure is isomorphous with those of th…
The luminescent characteristics of alkaline earth aluminates activated by divalent europium have been investigated. Ultraviolet excitation of these compounds can occur through the host lattice and from the 4f 7 ground state to excited states of the 4f 7 and 4f 6 5d 1 electronic configurations of divalent europium. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn interpretation of the circular dichroism and electronic spectra of salicylaldimine complexes of square-coplanar diamagnetic nickel(II)B. BosnichCite this: J. Am. Chem. Soc. 1968, 90, 3, 627–632Publication Date (Print):January 1, 1968Publication History Published online1 M…
The study of anharmonic effects in crystals has received considerable attention in the last few years. As a result of this it has been shown that many properties can be understood by expanding the interatomic potential and keeping only the lowest-order terms in the anharmonicity. The theory of thermal expansion, elast…
The fluorescence of a number of Bi3+ -activated phosphors is reported. Only host lattices containing a sublattice of large, trivalent cations are used, so that charge compensation of the activator is superfluous. The position of the broad emission band of these phosphors depends strongly on the host lattice and is fou…
A new electrooptic effect in certain classes of nematic liquid crystals is presented. The effect has been termed "dynamic scattering" because scattering centers are produced in the transparent, anisotropic medium due to the disruptive effects of ions in transit. The ions can be produced by field assisted dissociation…
Abstract not Available.
Abstract
Abstract The cross‐linking of poly [2.2‐propane‐bis‐(4‐phenyl carbonate)] by heating in a continuously evacuated system has been examined at various temperatures (295‐382°C). The effect of time and temperature on the viscosity of the polymer and the gel content is discussed.
Received 2 October 1967DOI:https://doi.org/10.1103/PhysRevLett.19.1423©1967 American Physical Society
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation G. Blasse, A. Bril; Hypersensitivity of the 5D—7F2 Transition of Trivalent Europium in the Garnet…