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Abstract The luminescence spectra of ZnO platelets at 1.9 K have been investigated under 3371 Å Insor excitation from 5 to 500 kW/cm 2 . New details in the P‐band luminescence (exciton‐exciton scattering) reveal the separation between A and B excitons in ZnO and the stimulated emission in this band is found to be stro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarch-Filled Polyvinyl Chloride Plastics-Preparation and EvaluationRichard P. Westhoff, Felix H. Otey, Charles L. Mehltretter, and Charles R. RussellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 2, 123–125Publication Date (Print):June 1, 1974Publication History Publi…
The electrical conductivity and ion/electron transference numbers in Al 3 O 3 were determined in a sample configuration designed to eliminate influences of surface and gas‐phase conduction on the bulk behavior. With decreasing O 2 partial pressure over single‐crystal Al 2 O 3 at 1000° to 1650°C, the conductivity decre…
Interaction potentials of many ion pairs are calculated using the model presented in our previous paper [J. Chem. Phys. 56, 3122 (1972)]. In the calculation of the interactions of two ions, the electron density of the combined system of the ions is assumed to be equal to the sum of the two separate ionic electron dens…
We investigate some kinetic properties of an isotopically disordered harmonic crystal. We prove rigorously that for almost all disordered chains the transmission coefficient of a plane wave with frequency ω, tN(ω), decays exponentially in N, the length of the disordered chain, with the decay constant proportional to ω…
H J Zeiger and G W Pratt Oxford: Clarendon Press 1973 pp xv + 660 price £19.50 Magnetic fields are among the most powerful tools available for the study of the eigenstates of electrons whether these electrons are in free motion, bound in isolated atoms or bound in a condensed phase of matter. The perturbation induced…
The far infrared spectrum of each ionic metal-metaphosphate glass, (MPO3)n (M = Li, Na, K, Rb, Cs) and [M(PO3)2]n (M = Ca, Sr, Ba), contains a broad absorption band whose peak frequency, ω0, and halfbandwidth, Δω1/2, are strongly dependent on the mass and charge of the glass-modifying cation. Each such band, which app…
A general theory of multilayer adsorption from a polymer solution at an interface is presented. The free energy of the solution in the presence of a plane surface is evaluated in the quasicrystalline model. The configurational entropy of placing a linear chain molecule in the liquid medium of nonuniform concentration…
Four varieties of asbestos are used in the plastics industry: chrysotile, crocidolite, amosite, and anthophyllite. Some are used as raw fiber, felts, cloth yarns, and paper. Asbestos wets out in resin systems but is difficult to disperse. Because of its high chemical reactivity, under certain conditions it tends to ca…
A simple technique of measuring the dynamic magnetostriction in silicon-iron using displacement transducers is discussed. The importance of stress and harmonics of magnetostriction is shown by considering the effects of improving the stress sensitivity of steel and reducing core vibration by a suitable bonding techniq…
Data on resistivity at room temperature in polycrystalline and single-crystal Permalloy (80 Ni-20 Fe) thin films are analyzed in terms of grain boundary scattering and the dc size effect, respectively.
An attempt has been made to equate quantitatively the coercive force as a function of the grain size and the concentration of nonmagnetic inclusions. It was found that the coercive force Hcof recrystallized 47.5% nickel-iron can be completely described, independent of the final anneal temperature, by the grain size dK…
Laser-excited fluorescence measurements have given rate constants for the vibrational deactivation of NO(v=1) by NO, He, and N2, and for the V–V exchange between CO(v=1) and NO(v=1) in the temperature region 100–300°K. Relaxation was caused entirely by bimolecular collisions. Deactivation rates of NO(v=1) by H2O, D2O,…
For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology.
A new grain-oriented silicon steel with a higher degree of grain orientation than usually obtainable by known conventional procedures was developed. The new material (HI-B) has made large improvements in core loss and magnetostriction characteristics by effects due to surface coating that are more remarkable with a hi…
The phenomenology and atomic origins of magnetocrystalline anisotropy are reviewed, and the experimental data are summarized for the spinel ferrites, garnets, metals of the 3d and 4f transition series, and some selected rare earth compounds. Only intrinsic magnetocrystalline anisotropy is covered, and attention is pri…
Bias (dc electric field) dependence of the dielectric constant of ferroelectric ceramics of the Pb(Zr,Ti)O3 type has been investigated. Measurements were carried out at various temperatures in the ferroelectric phase and at several frequencies between 1 kHz and 1 MHz. The bias characteristics of the dielectric constan…
Auger electron spectroscopy has been used in situ to characterize the surfaces of evaporated silver-gold alloy films grown epitaxially on heated mica [(111) orientation]. The films were shown to be free of any detectable surface impurities. The known energy dependence of the electron escape depth in these metals was u…
Data and interpretation are presented for inelastic electron scattering in the quasielastic region from nine target nuclei ranging from lithium to lead at an incident energy of 500 MeV and a scattering angle of 60\ifmmode^\circ\else\textdegree\fi{}. The average kinetic and separation energies of nucleons in these nucl…
The idea that, with filled polymers, length fraction, area fraction, and volume fraction of filler are different appears to have gained wide acceptance. The fallacy of this, except for special directions in ordered arrangements, is demonstrated. This misunderstanding has led to widespread misinterpretation of experime…