Materials Literature
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A simple model for an interacting liquid of particles lacking an axis of rotational symmetry is proposed. The four order parameters necessary to describe an ordered phase are identified. An ensemble of such particles is described by a mean field theory. A phase diagram showing both uniaxial and biaxial phases results.…
Abstract A comparative study is made of the surface and bulk crystallinities of poly(ethylene terephthalate) films subjected to the following treatments: a) annealed at different temperatures in dry nitrogen, b) annealed in inert atmosphere and then boiled in water, and c) heated in water at various temperatures up to…
Abstract Mechanische Spannungen wirken beschleunigend auf die Umwandlung der tetragonalen in die hexagonale Kristallform (II nach I‐Umwandlung) von Polybuten‐1. Untersuchungen über den Einfluß von unaxialen Zugspannungen ergaben, daß die II nach I‐Umwandlung erst dann beschleunigt abläuft, wenn die Streckspannung erre…
The compositional dependence of the dc conductivity of ${\mathrm{As}}_{x}{\mathrm{Te}}_{1\ensuremath{-}x}$ films with $0.3<x<0.78$ was measured. The resistivity over the entire compositional range investigated could be described with an effective-medium percolation theory. No adjustable parameters enter into thi…
The shapes of closed dislocation shear loops were obtained by a self-stress method which takes into account both the crystal anisotropy and the dislocation self-interaction. Based on the results, a correlation between applied stress and loop size was established. This correlation requires one parameter to account for…
The positron lifetime of a glassy Pd0.775Cu0.06Si0.165 alloy decreases only slightly on crystallization. This suggests that the glassy alloy contains negligible fractional concentration (< 10−5) of vacancy-like defects, and the crystallite model may be excluded as a possible structure of metallic glasses; however, a m…
We present theoretical and experimental second-order Raman spectra for NaF, KF, RbF, and CsF. The theoretical calculation follows the formalism of Born and Bradburn. For the lattice-dynamic calculation we use the deformation-dipole model and present comparisons with measured dispersion curves. For the polarizability c…
Space-charge-limited-current measurements have been performed at room temperature on GaSe single crystals. The samples investigated were $p$ type and were grown from the melt by using the Bridgman-Stockbarger method. Three well-defined deep-lying hole traps have been found at 0.421, 0.465, and 0.543 eV above the valen…
Electrochemical deposition of up to a monolayer of \nmetal on foreign substrates at potentials positive to the \nreversible one (underpotential deposition) has been \nknown for some time. 1,2 It appeared interesting to see \nif an electrochemically deposited layer of these adatoms, \nwith partial i…
Electron paramagnetic resonance measurements of some trivalent rare earth ions in single crystal La2O2S have been performed at low temperatures. At approximately 1.5 K, two sets of four [I=(3/2)] Tb+3 lines have been observed. Site I has a minimum resonance position when the magnetic field is parallel to the c axis an…
The wavenumbers for the librational and the high frequency modes in the ``disordered'' NH4Cl and NH4Br were obtained from polarized Raman spectra with values for unresolved peaks determined by fitting the Raman intensity to damped uncoupled oscillators. The high frequency and the librational modes were studied isother…
An expression is derived for the magnetic susceptibility of an intrinsic semiconductor in a tight-binding basis that is valid for both crystalline and amorphous materials. In addition to diamagnetic intraband terms proportional to the square of the tight-binding radii there are interband terms involving intersite matr…
The eigenvectors of the normal-process collision matrix are used to derive equations for energy and crystal-momentum balance from the linear phonon Boltzmann equation. The balance equations obtained are valid when $\ensuremath{\omega}{\ensuremath{\tau}}_{N}\ensuremath{\ll}1$ and ${\ensuremath{\tau}}_{N}\ensuremath{\ll…
The thermal conductivity of 2000-9000-\AA{}-thick amorphous and crystalline films of Ge and GeTe has been measured in the temperature range 100-550\ifmmode^\circ\else\textdegree\fi{}K. No thickness dependence has been observed in these films down to 2000 \AA{}. The results show that crystalline Ge and amorphous Ge and…
X-ray photoemission spectroscopy (XPS) data for the valence bands of Rh, Pd, Ag, Ir, Pt, and Au are compared with densities of states calculated from interpolated band structures. The parameters of the interpolation scheme were obtained in an earlier paper by fitting first-principles augmented-plane-wave calculations,…
The Landau levels for the $\ensuremath{\pi}$ bands of graphite are calculated using the Slonczewski-Weiss-McClure energy-band model. Bohr-Sommerfeld quantization is used to calculate two new types of magnetic energy levels which trigonal warping introduces. The method is valid for any magnitude of ${\ensuremath{\gamma…
We have solved Maxwell's equations for the fields localized near the surface of a doped semiconductor possessing either a depletion layer, an accumulation layer, or an inversion layer. We present the dispersion relation for the frequency of the surface plasmon polariton as a function of the wave vector parallel to the…
The contributions of monopoles, dipoles and quadrupoles to the electric field gradient at B sites of normal cubic spinels, ZnAl 2 O 4 , ZnFe 2 O 4 , CoAl 2 O 4 , MgAl 2 O 4 , CdFe 2 O 4 and WNa 2 O 4 have been calculated. From a comparison with experimental results, a coherent range of variation of the dipole polariza…
The intensity distribution on the specimen was computed by using the pupil function in terms of electron wave optics, and the spot size (defined as 80% of the total electron beam spread) was precisely obtained from this intensity distribution. From the computer simulation data the following results were obtained. (1)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of molybdenum in plutonia cermets by x-ray fluorescence spectrometryH. A. Woltermann and W. W. StrohmCite this: Anal. Chem. 1974, 46, 12, 1822–1823Publication Date (Print):October 1, 1974Publication History Published online1 May 2002Published inissue 1 October…