Materials Literature
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The pure ${\mathrm{As}}^{75}$ nuclear quadrupole resonances (NQR) of crystalline and amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ have been investigated and compared. The temperature dependence of the resonance frequencies, the asymmetry parameters $\ensuremath{\eta}$, and the orientation of the principal axes of t…
The role of many-body effects in the radiationless decay of an excited atom in the vicinity of a metallic surface is studied. In particular we calculate the decay rate for deexcitation by surface-plasmon emission and find it to be a rather likely process. The rate depends on the surface-plasmon dispersion relation and…
Polarity-dependent memory switching has been observed in devices of crystalline SnSe and SnSe2 with aluminum contacts. Two types of low-level switching (1 V/1 mA) with reversed polarity dependence can be obtained in suitably formed devices of either material. In addition, a high-level (100 V/10 mA) polarized memory sw…
It is well established that exposure of KCl:AgCl (or KCl:TlCl) crystals at 77 K to ionizing radiation results in the trapping of holes as $\mathrm{Cl}_{2}^{}{}_{}{}^{\ensuremath{-}}$, ${V}_{K}$ centers, and electrons as ${\mathrm{Ag}}^{0}$ (${\mathrm{Tl}}^{0}$). These crystals emit luminescence at 77 K which persists…
The influence of pressure on lattice vibrations in two molecular crystals, the ring-molecule elemental crystal orthorhombic sulfur and the layer-structure chalcogenide crystal ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$, has been measured by observations of their first-order Raman-scattering spectra at pressures to 10 kbar.…
In addition to presenting an expression for the pressure which is valid for all treatments of exchange and correlation, we derive a new relation for the kinetic energy of the cores which, in the muffin-tin approximation, leads to an algebraic cancellation of various core contributions to the pressure. Thus, numerical…
Neutron-scattering experiments have elucidated the mechanism of the successive phase transitions of CsPb${\mathrm{Cl}}_{3}$ at 47, 42, and 37\ifmmode^\circ\else\textdegree\fi{}C. These phase transitions are basically associated with the condensation of rotational modes of Pb${\mathrm{Cl}}_{6}$ octahedra around the thr…
The magnitudes, anisotropy, and temperature dependences of the three independent elastic constants of copper irradiated below 4 K with thermal neutrons provide evidence for the 100> split configuration of free interstitials and thermally excited resonance modes, and lead to a model for the configuration of the ${I}…
A theory of cooperative effects in ionic solids is presented, which points to the ionic carrier density as the main source of the anomalous behavior found in solid electrolytes. Depending on the parameter values, it predicts either an exponential increase of the conductivity with temperature, or a discontinuous change…
Changes in chemical oxidation states in alloys and at solid-solid interfaces were monitored by using x-ray photoelectron spectroscopy. For an oxidized Nichrome surface, the chromium component was selectively converted to chromic oxide while nickel remained in the metallic state. When this surface was overlaid with a 2…
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It has already been shown that one source of the patched appearance in twisted nematic displays is reverse twist; we now demonstrate the existence of another. Both types of patches have been eliminated by the use of cholesteric additives in combination with particular types of surface alignment.
An extensive investigation of the mechanical properties of cast ASTM A216 steel WCB and WCC grades, as functions of composition, heat treatment and casting thickness is reported. Castings in section thicknesses ranging from 2 1/2 in. to 10 in. were produced from twenty-two commercial size heats by five different found…
When chlorine (real gas , 980 mmHg) combines with white (a) phosphorus to form phosphorus pentachloride at 24.89 C, 3986.32.7 J of heat are liberated per gram of stoichiometrically equivalent Mg,P,07. This value was determined by a dead-ended flow system in an electrically calibrated isoperibol calorimeter. Correction…
Abstract Values of the polymer-solvent interaction parameter were obtained for cis -1,4-poly(butadiene) vulcanized with alkylphenol—formaldehyde oligomer, sulfur, and peroxide systems swollen with heptane, benzene, and m -xylene. The dependence of the interaction parameter on the degree of crosslinking was demonstrate…
The amorphous alloys are quench-condensed from the vapour phase on a substrate at 4 K. The electrical resistivity of amorphous Ge + 41 at. % Au, Bi + 15 at. % Ag and Sn + x at. % Cu (x = 10 to 80) is measured. An unusual linear temperature dependence is found with negative dope for Ge, Bi and Sn alloys and with a posi…
Abstract The effect of changes in crystallinity on the β‐transition in poly(vinyl chloride) was studied by dynamic mechanical measurements of loss tangent (tan δ) and storage modulus ( E ′) over the temperature range −160° to 85°C. Four frequencies were covered, 3.5, 11, 35, and 110 Hz. The data presented demonstrate…
The self‐association of chymotrypsinogen A at pH 8.1 and at ionic strength of 0.021 has been examined by means of sedimentation equilibrium. The data have been analyzed by several methods and results compared. Application of the older methods available in the literature indicate that the concentration dependence of mo…
This work used a conventional thermomechanical analyzer (TMA) to measure the depth of indentation at room temperature of elastomers and Finkin's equation to calculate Young's moduli of elastomers, which have been measured by Drutowski, from the radius of contact of an indentor on thin sheets of sample. Data obtained f…
The mineral brazilianite, NaAI3(PO4)2(OH)4, is monoclinic, space group P21/n, with a = 11.233 (6), b = 10142 (5), c=7-097 (4) ,& and fl=97.37 (2) A~. With Z = 4 the calculated density, 2.998 (4), compares well with the measured density, 2.98 (1) gcm -3. The structure was solved by direct phasing and Fourier techniques…