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Geometrical and structural relations in the rhombohedral perovskites
The rhombohedral perovskites are of interest in lattice dynamics (e.g. LaAlO3, PrAlO3) and for their ferroelectric properties (e.g. LiNbO3, PbZr/TiO3). In this paper, data scattered through the literature are correlated, with correction of some misleading mistakes of calculation. Geometrical descriptions are put in a…
Thermally Induced Phase Separation Behavior of Compatible Polymer Mixtures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally Induced Phase Separation Behavior of Compatible Polymer MixturesT. Nishi, T. T. Wang, and T. K. KweiCite this: Macromolecules 1975, 8, 2, 227–234Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March 1975https:…
Statistical mechanics of dense ionized matter. III. Dynamical properties of the classical one-component plasma
We present extensive molecular-dynamics (MD) computations of the time-dependent correlation functions of the classical one-component plasma over a wide range of thermodynamic states characterized by the dimensionless parameter $\ensuremath{\Gamma}=\frac{{e}^{2}}{a{k}_{B}T}$, where $a$ is the ion-sphere radius. The com…
Molecular Vibrations of Three Crystal Forms of Poly(vinylidene fluoride)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Vibrations of Three Crystal Forms of Poly(vinylidene fluoride)Masamichi Kobayashi, Kohji Tashiro, and Hiroyuki TadokoroCite this: Macromolecules 1975, 8, 2, 158–171Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue…
The quantitative analysis of thin specimens
SUMMARY Results are reported concerning the use of an energy dispersive X‐ray detector to carry out the analysis of thin foils in the electron microscope. The combination of a thin specimen and the extreme stability of the energy dispersive X‐ray detector enables the experimental determination of a calibration curve o…
Charge-density waves and superlattices in the metallic layered transition metal dichalcogenides
The d1 layer metals TaS2, TaSe2, NbSe2, in all their various polytypic modifications, acquire, below some appropriate temperature, phase conditions that their electromagnetic properties have previously revealed as ‘anomalous’. Our present electron-microscope studies indicate that this anomalous behaviour usually inclu…
Extreme Toxicity from Combustion Products of a Fire-Retarded Polyurethane Foam
The products from nonflaming combustion of wood and a trimethylol-propane-based rigid-urethane foam that was not fire-retarded produced elevated carboxyhemoglobin levels but no abnormal neurological effects. However, when this type of foam contained a reactive phosphate fire retardant, the combustion products caused g…
Peierls structure transition in quasi-one-dimensional crystals
This review is concerned with the structure, electrical, and optical properties of mixed-valence platinum complexes of the K2 Pt(CN)1, Br0.303H2O type and of TTF-TCNQ salts. Special attention is paid to the experimental results on the anisotropy of electron motion in these quasi-one-dimensional crystals. The theory of…
Flow induced polymer chain extension and its relation to fibrous crystallization
Abstract This work examines the effect that appreciable molecular extension has on the crystallization of long chain molecules. Elementary theoretical considerations presented indicate that to achieve high molecular extensions in solution a longitudinal velocity gradient of strain rate about 103s-1 is required. A meth…
Environmental crack and craze growth phenomena in polymers
Abstract The nature of slow crack and craze propagation in polymers and crack propagation in inorganic glass has been considered in terms of time dependent processes. By using a fracture mechanics analysis together with time dependent material parameters, equations have been derived to describe crack and craze propaga…
Pendular rings between solids: meniscus properties and capillary force
The Laplace–Young equation is solved for axisymmetric menisci, analytically in terms of elliptic integrals for all possible types of pendular rings and liquid bridges when the effect of gravity is negligible, numerically for selected other cases in order to assess gravity's effect. Meniscus shapes, mean curvatures, ar…
The metal-non-metal transition in VO2: X-ray photoemission and resistivity measurements
The semiconductor-metal transition in VO 2 has been investigated by means of XPS measurements. The band gap in the semiconducting region is found to be temperature-dependent with a room temperature value of E g =0.3 eV, in agreement with resistivity measurements. The core lines, which are asymmetric below T nu broaden…
Photoemission Partial State Densities of OverlappingpanddStates for NiO, CoO, FeO, MnO, andCr2O3
We report partial densities of states of overlapping bandlike $p$ states and localized $d$ states in several insulating transition-metal oxides which have been determined from frequency-dependent photoemission spectra taken in the range 5-90 eV. We observe that $p$-band features become weak relative to $d$-state and s…
Local Inhomogeneity of Garnet Crystals Doped with Rare-Earth Ions
Some defects of the host lattice of crystals of the T3Al5O12 series (where T is Tb, Dy, Y, Ho, Er, Tu, Yb, Lu) doped with rare-earth ions (TR3+), are investigated by means of an analysis of the inhomogeneous splitting of the spectral lines of the TR3+ impurity ions. The connection of the concentration of some defect t…
The DO22 Intermediate Phase in the Ni-Mo System
A study of Ni3Mo by electron microscopy and electron diffraction reveals the presence of a new metastable intermediate phase during the early stages of ordering. This phase having the DO22 structure is only observed under well specified experimental conditions; it is generated immediately from the short range ordered…
Luminescence of Lead Molybdate and Lead Tungstate. I. Experimental
Optical properties of single crystals of lead molybdate and lead tungstate (scheelite structure) have been investigated in order to identify the nature of the luminescent centres. Absorption, emission, and excitation spectra at different temperatures (1.5 to 300 K) and photoconductivity and quantum efficiency measurem…
Optical aging characteristics of borosilicate clad fused silica core fiber optical waveguides
Very low transmission loss fiber optical waveguides have been developed during the past two years which have pure fused silica cores surrounded by borosilicate glass claddings. A recent study of the binary borosilicate glass system revealed that the low refractive index values which can be achieved with this glass and…
Electron–Phonon Interactions in an Insulator
A new technique is presented for evaluating the electron Green function G k (t) in an insulating electron–phonon system. The technique is particularly suitable for those electron–phonon interactions in which the long wavelength phonons are of prime importance such as the polaron and piezoelectric interactions.An exact…
Multiphonon absorption in ionic crystals
Calculations of the frequency and temperature dependence of infrared multiphonon absorption for the alkali halides and alkaline-earth flourides are compared with previously published data and some new results. The temperature dependence of the infrared absorption of pure crystals of NaF, NaCl, and KCl at 10.6 \ensurem…