Materials Literature
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Polycrystalline boron nitride films have been deposited using microwave plasma-enhanced chemical vapor deposition. IR absorption spectra of films deposited using NaBH4 as the boron source in NH3 and H2 gases showed absorptions which are nearly the same as the characteristic vibrational modes seen in cubic and pyrolyti…
Abstract Interaction in the system isotactic polypropylene–calcite was investigated using X‐ray diffraction and transmission electron microscopy. Calcite acts as a weak nucleation agent for polypropylene crystallization and its activity could be increased or decreased by a suitable surface treatment. Investigation of…
Abstract The relationship between the particle sizes and minimum film formation temperature (MFT) of polymer colloids was studied. Early workers had developed theoretical models predicting small particle colloids should coalesce easier and have lower MFTs than those of large colloids. Early published work examining th…
Abstract Flexural test specimens were injection‐molded from polypropylenes added with 0.5 wt % of calcium carbonate, talc, p ‐ tert ‐ dibutyl‐benzoic acid monohydroxy aluminum, or p ‐di‐methyl‐benzylidene sorbitol under cylinder temperatures of 200–;320°C. Properties such as flexural modulus, flexural strength, heat d…
Abstract Three algorithms for draping biaxially woven fabrics on arbitrarily curved surfaces are presented and compared for numerical accuracy and computational expense. The first one minimizes the elastic energy in each fabric cell, while the two others are based on placing a net of interlocked and inextensible fibre…
Thin-film heterostructures of Bi(4)Ti(3)O(12)Bi(2)Sr(2)CuO(6+x), have been grown on single crystals of SrTiO(3), LaAlO(3), and MgAl(2)O(4) by pulsed laser deposition. X-ray diffraction studies show the presence of c-axis orientation only; Rutherford backscattering experiments show the composition to be close to the no…
The dependence of the pre-exponential factor (σ0) on the activation energy (ΔE) is investigated for SeTe, SeTeM, GeSe, and GeSeM glassy alloys where M is a metal. An approximate linear dependence of In σ0 on ΔE is observed in SeTe and SeTeM systems with good quantitative agreement between the expected and cal…
The effect of strain rate on yield point and dislocation density evolution during compression, as well as on the rate and depth of relaxation after some preliminary deformation and on 7.5 MHz ultrasonic attenuation of NaCl crystals is studied. The existence is found of a critical strain rate, at which the applied and…
We measure the viscosity of glycerol by using photon correlation spectroscopy to observe the Brownian motion of small (∼100 nm) polystyrene spheres. By comparing the viscosity measured with different size spheres, we can measure the length scale dependence of the viscosity as the liquid is cooled towards the glass. In…
Optical spectra of YAlO 3 (YAP) single crystals are measured for < a >, < b > and < c >// E in the region from 6.5 eV to 42 eV by use of a plane polarized synchrotron radiation, E being the electric field of light. Anisotropic spectral behaviour of the intrinsic absorption including the tail absorption is found, and a…
The satellite structure in both core-level and valence-band photoemission spectra from single-crystal MnO(100) has been studied by using both x-ray photoemission spectra and resonant photoemission. Only very weak satellites are present in the Mn 2p core-level spectra, while no satellite structure is evident in the Mn…
Two-photon-absorption (TPA) spectra of poly(di-n-hexylsilane) (PDHS) films are obtained from 605 to 410 nm at 295 and 11 K, where the intensity is an order of magnitude higher. A strong TPA band is found above 5 eV and interpreted in terms of interacting \ensuremath{\sigma} electrons in a Pariser-Parr-Pople (PPP) mode…
Elastic differential and total cross sections are presented for electron scattering by zinc and cadmium using the optical model. The cross sections are determined for scattering by free atoms and by atoms bound in a solid. The phase shifts are obtained from solutions to the reduced radial wave equation based on an opt…
The emission from KCl:Sb3+ and KI:Sb3+ excited in the A-absorption band was measured as a function of exciting photon energy and temperature. The A-band excitation produced two emission bands for KCl:Sb3+ and a single band for KI:Sb3+. The definitive assignment of these bands is presented in terms of the adiabatic pot…
We analyze the surface-wave propagation in homogeneous layers of chiral or optically active materials. Two cases of chiral slab are considered: a symmetric chiral slab waveguide and a grounded chiral slab waveguide. The dispersion relation and the electric-field components for surface waves guided in a symmetric chira…
Surface plasmon-polariton modes supported by thin metal films surrounded by dissimilar semi-infinite dielectrics are studied. The dispersion of the modes is evaluated, and their characteristics are investigated when the metal film thickness and the superstrate refractive index are varied. Long-range surface plasmon-po…
Pressure-tuned resonant Raman scattering was used to determine the band-gap shift due to quantum size effects of microcrystalline CdS in glass composites and colloids. The wurtzite- to rocksalt-phase-transition behavior in the microcrystallite CdS systems was also studied and is quite different from that in bulk CdS.…
An interatomic potential based on the second-moment approximation of the tight-binding scheme is developed for zirconium, by fitting its four adjustable parameters to the cohesive energy, atomic volume, and elastic constants of the hcp phase. In this work we attempt to model realistically two different crystallographi…
We have demonstrated the iodine doping of vacuum-deposited pentacene (PEN) film which showed characteristic changes in structure and electrical conductivity. The iodine-doped film exhibited a high electrical conductivity of 110 Ω−1 cm−1, which was 11 orders of magnitude larger than that of as-deposited film, and a hig…
Measurements of the first-order Raman spectrum in natural type-IIa diamond for the temperature range of 293 to 1850 K are presented. Both the Stokes and anti-Stokes components are analyzed for their intensity, Raman shift, and width variation with temperature. Optical pyrometry was used to make the temperature measure…