Materials Literature
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It is suggested that in chalcogenide glasses, elements such as Cu or Mn can have coordination number 4 and be negatively charged, and that the compensating positive charge is provided by D+ centres. The law of mass action ensures that the concentration of D-centres is then small. Under these conditions the Fermi energ…
Abstract A study was made of the dielectric relaxation in polyethylenes rendered dielectrically active through oxidation (0.5–1.7 carbonyls/1000 CH 2 ) and chlorination (14–22 Cl/1000 CH 2 ). Both linear and branched polymers were studied. All of the relaxations between the melt and −196° were studied in the frequency…
By the X-ray scattering measurements of TTF-TCNQ, two anomalies at q b =0.29 b * and 0.41 b * are studied, where q b is the component of the wave vectors of phonons and superstructures along the b * -axis. The anomaly at 0.29 b * appears in the TA phonon mode below 150 K and becomes the superstructure below 54 K. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of carbonylmetalloporphyrins. The structure of (pyridine)(carbonyl)(5,10,15,20-tetraphenylporphinato)iron(II)Shie-Ming Peng and James A. IbersCite this: J. Am. Chem. Soc. 1976, 98, 25, 8032–8036Publication Date (Print):December 1, 1976Publication History Publ…
In this paper experiments with reactive evaporation of the starting materials Ti, TiO, Ti(2)O(3), Ti(3)O(5), and TiO(2) to obtain nonabsorbing TiO(2) films are under discussion. For the starting materials TiO and Ti(3)O(5) the dependence of the TiO(2) film refractive index on the substrate temperature, oxygen pressure…
A bstract A new technique is developed for shaping the pressure bubble pulse radiated by an array of air‐guns. It involves the proper spacing of identical units. It is shown that considerable shortening of the pressure bubble pulse can be achieved provided there is sufficient mutual coupling between all the air‐guns.…
To determine the interlayer exchange field H ' E in quasi-two-dimensional magnets (C n H 2 n +1 NH 3 ) 2 CuCl 4 with n =1-6 and (C 6 H 5 C m H 2 m NH 3 ) 2 CuCl 4 with m =1, 2, the lowest Brillouin-zone-boundary magnons are parametrically excited by parallel pumping technique in the temperature range from 1.2 to 4.2 K…
This paper is an analysis of the present knowledge of the formation, removal, and prevention of scale. This examination of the state of the art is presented to indicate the limits of current knowledge of oilfield-scale problems and to instigate additional research into these problems. problems. Introduction This paper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of solvent and substituent effects on the redox potentials and electron-transfer rate constants of substituted iron meso-tetraphenylporphyrinsK. M. Kadish, M. M. Morrison, L. A. Constant, L. Dickens, and D. G. DavisCite this: J. Am. Chem. Soc. 1976, 98, 26, 8387–8390…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriboluminescence and pressure dependence of the photoluminescence of tetrahedral manganese(II) complexesGordon E. Hardy and Jeffrey I. ZinkCite this: Inorg. Chem. 1976, 15, 12, 3061–3065Publication Date (Print):December 1, 1976Publication History Published online1 May 2002P…
The stresses produced in a solid by cavitation generated in distilled water by 10-, 20-, and 30-kHz vibrations have been determined by a transducer technique. The measured stress pulses are attributed to the concerted collapse of the whole cloud of bubbles created by the pressure changes in the water rather than to th…
The effective vibration-rotation hamiltonian for the first excited state of a triply-degenerate vibration in a tetrahedral XY4 molecule is considered, and the principles involved in formulating totally symmetric operators for use in the hamiltonian are reviewed. Explicit expressions are given for all such operators up…
The magnetocrystalline anisotropy of low temperature phase of magnetite (Fe 3 O 4 ) was measured for a monoclinic single phase specimen by using computerized fully-automatic torque magnetometer. The anisotropy is expressed by \begin{aligned} E_{\text{a}}=K_{a}\alpha^{2}_{a}+K_{b}\alpha^{2}_{b}+K_{aa}\alpha^{4}_{a}+K_{…
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