Materials Literature
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Abstract This work reviews the literature published over the last ten years on polymer mechanical properties as a function of molecular weight and molecular weight distribution, Thermal properties, stress‐strain properties, impact, fracture, fatigue, creep, stress relaxation and cracking and crazing are examined for a…
Heretofore unpublished enthalpy data which were used in the derivation of smooth enthalpy and heat-.capacity data for NBS SRM 720 (a-A1, 2 0, heat capacity and enthalpy standard) are presented along with some details of the high-temperature experiments. Recent NBS low-temperature measurements on SRM 720 are smoothed b…
Göran Grimvall 1981 Amsterdam: North–Holland xiv + 304 pp price Dfl125 This book is a very concise account of the electron–phonon interaction, guiding the reader through a wide range of formulae and results. The author starts off with the origin of electron–phonon scattering, discusses ways of calculating the interact…
An analysis is made of the thermoelastic action of high-power pulse-periodic laser radiation on the surface of a solid. The analysis is made using relationships, similar to Duhamel integrals, between the characteristics of the thermally stressed state on exposure to cw and arbitrarily time-varying laser radiation. Cal…
Results obtained during 1960–1979 on the effect of the size of a saturated or partly hydrogenated carbo- or hetero-cycle on the physicochemical (spectral, polarographic, ionisation) and chemical properties of cyclic compounds are summarised. Attention is paid mainly to the usual (C5–C7) cyclic systems. Results are int…
Near-normal-incidence reflectivity measurements have been made over the energy range 0.5 to 5 eV at room temperature and 77K for the following layered materials: TiS2, TiSe2, ZrS2, HfSe2 and HfTe2. Both freshly cleaved basal planes (E perpendicular to c; k//c) and as-grown edge planes (E perpendicular to c, E//c; k pe…
A new ceramic, nitrogen-stabilized aluminum oxide spinel (ALON), has been developed at AMMRC which may have distinct advantages over sintered polycrystalline a-A1<sub>2</sub>0<sub>3</sub>. This material is isotropic and has been fabricated into dense, transparent bodies with the following properties: Knoop (100) hardn…
The infrared cut-off of glasses is primarily determined by the frequency of vibration of the cation-anion bonds. In order to extend infrared transmittance to longer wavelengths cations and anions of larger sizes and lower field strengths should be used; however, physical and chemical properties become poorer. For sili…
The valence of an atom occupying a particular crystal lattice site can be determined from the chemical shift in a transmission electron energy-loss spectrum obtained with the intensity of the incident electron wave maximized at that site by dynamical electron diffraction. The new technique is demonstrated by determini…
A laser-induced pressure-pulse method for measuring the charge distribution in (10 to 100 \ensuremath{\mu}m thick) dielectric samples with a resolution of about 4 \ensuremath{\mu} m is described. A short ( ns) energetic light pulse from a neodymium-doped yttrium aluminum garnet laser is applied to a specially coated s…
V centres have been studied in pure KBr using optical absorption and Raman scattering experiments. Raman spectra show that Br 3- ions can be created in samples X-irradiated at 190K. They are correlated with the V 4 absorption band (270 nm). After X-irradiation at room temperature, Br 2 -type (Br 5- centres are created…
Constant-psi constant-delta contour maps in the reduced angle-of-incidence-film-thickness plane that are useful in ellipsometry and in design of reflection-type optical devices are discussed. As a specific example, a contour map is given for the SiO(2)-Si film-substrate system at the 6328-A He-Ne laser wavelength.
Low-temperature microwave conductivity data for $\mathrm{Na}\ensuremath{\beta}$-alumina have been analyzed in terms of the standard tunneling model of disorder-induced two-level states. In addition, the microwave dielectric constant has been studied as a function of temperature between 0.3 and 15 K for Na, K, and ${\m…
The lattice vibration in 2$H$-Ta${\mathrm{Se}}_{2}$ was investigated by one- and two-phonon Raman scattering in the normal and the charge-density-wave (CDW) phases. From the integrated scattering intensity of the two-phonon-process peak, the temperature dependence of the generalized electronic susceptibility was obtai…
The theory of natural optical activity in the 4f→4f transitions of trigonal dihedral (D3) lanthanide(III) complexes is developed within the framework of a crystal field model. Within this model, both the chiral and achiral components of the crystal field are represented in terms of multipole-point charge and multipole…
Analysis of the temperature-dependent decay of surface voltage on an amorphous film after charging but prior to exposure (xerographic dark decay) and of residual decay after exposure can, in combination, be used to map the density of states and position the Fermi level. The procedure is illustrated for $a$-Se where bo…
A reexamination is made of previous resistivity data of the Ti${\mathrm{O}}_{0.80\ensuremath{-}1.23}$ metallic oxide system, in which very large positive and negative temperature coefficients of resistivity $\ensuremath{\alpha}$ are observed. Ti${\mathrm{O}}_{0.80\ensuremath{-}1.23}$ samples contain a large number of…
The electronic density-of-states and the partial-density-of-states functions for the 14 primary bands of the $\mathrm{AB}{\mathrm{O}}_{3}$ cubic $d$-band perovskites are derived as simple, closed form, analytical formulas with the use of an empirical linear-combinations-of-atomic-orbitals model. Comparisons of the mod…
Recent experimental evidence has established that the scattering of phonons by dislocations at low temperatures in [110] LiF rods is primarily a dynamic rather than a static process, but calculations of the effects of vibrating dislocations have failed to provide quantitative agreement with experimental observations o…
The interaction of H2O with the clean Fe(110) surface, Fe(110) surfaces with absorbed oxygen, and Fe(110) surfaces after bulk oxygen penetration were investigated using UPS. At 225 K, surface absorbed hydroxyl groups are present on all surfaces studied. On initially clean Fe(110) and surfaces with up to half monolayer…