Materials Literature
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Hexagonal plate martensite in titanium alloys contains a dense substructure whose character and origins have not been completely addressed in the literature. The substructure is shown to consist of columnar domains which extend along basal planes from the midrib of the martensite plates to the habit plane and are boun…
A Monte Carlo model was used to simulate specimen-electron beam interactions relevant to electron back-scattered diffraction (EBSD). Electron trajectories were calculated for a variety of likely experimental conditions to examine the interaction volume of the incident electrons as well as that of the subset of inciden…
The amount of plasma protein adsorbed on a phospholipid polymer having a 2-methacryloyloxyethyl phosphorylcholine (MPC) moiety was reduced compared to the amount of protein adsorbed onto poly[2-hydroxyethyl methacrylate (HEMA)], poly[n-butyl methacrylate (BMA)], and BMA copolymers with acrylamide (AAm) or N-vinyl pyrr…
A theory was formulated for the description of circularly polarized fluorescence (CPF) from a chiral nematic film in the spectral region outside the selective reflection band. The CPF theory incorporates: (1) the ability of a chiral nematic film to accomplish both circular dichroism and circular polarization and (2) l…
The esterification reaction between lignocellulosic materials (ALCELL lignin and Bleached kraft cellulose) and maleated polypropylenes (graft copolymerization of maleic anhydride into polypropylene chains) was investigated. The reaction was conducted in a reactor in the presence of xylene used as a solvent and sodium…
The potential-energy surface underlying the liquid dynamics Hamiltonian is supposed to consist of a large number of intersecting, macroscopically similar, nearly harmonic random valleys. The statistical mechanics replaces each valley with an infinitely extended harmonic potential surface and then corrects for (a) the…
Abstract Despite substantial scientific research efforts, accurate determination of the petrophysical effects of clay minerals on reservoir sands remains problematic. Diagenetic clays such as smectite and illite are of particular interest because of the pronounced effects these clays can have on reservoir quality. Her…
Fine-structure collision strengths are calculated for transitions between the ground-state levels of atomic oxygen. The R-matrix method is used in which the (2p4) 3P, 1D and 1S terms are included as well as three pseudo-states chosen to represent the dipole polarizability of the 3P ground state. Very sophisticated con…
The electrical transport properties of SiO2 films (⩾3 μm in thickness) containing Ge nanocrystals have been studied. We found that the films exhibit T−1/2 dependence of ln(σ) under relatively low electric fields independent of the volume fraction of Ge in the films, where T and σ are the temperature and the conductivi…
Technologically important lead‐based ferroelectric niobates of the type A(B′B″)O 3 (where A is Pb, B′ is Fe, Ni, Mg, or Zn, and B″ is Nb), and their solid solutions with barium titanate and lead titanate, have been prepared via a solution combustion process that involves metal nitrates/oxalate and tetraformal trisazin…
A new procedure to perform quantitative analysis without any internal standard has been developed within Rietveld analysis. This new approach permits solution of the problem due to the presence of an amorphous phase when its chemical composition or the global sample composition is known. The equations developed, based…
The concept of the reference lattice has been thoroughly discussed in physical and in higher-dimensional spaces. Such an approach has been applied to diffraction pattern analysis of different periodic, modulated and other aperiodic structures. It has been shown that two periodicities can be found in diffraction patter…
We measured the third-order susceptibilities χijkl〈3〉 of new bisdithiafulvenyl-substituted tetrathiafulvalene, using the degenerate four-wave mixing method. From these measurements we deduced the values of the second-order hyperpolarizabilities γ and their molecular and electronic contributions. We compared the third-…
This article is devoted to the conduction mechanisms involved in some highly electrically anisotropic resin–graphite particle composites. These materials are known to show a percolation phenomenon as the filler content is varied; they are epoxy or polyurethane based, the conducting particles are oriented single-crysta…
This volume describes the state-of-the-art research topics in theoretical materials science. It encompasses the computational methods and techniques which can advance more realistic calculations for understanding the physical principles in new growth methods of optoelectronic materials and related surface problems. Th…
Abstract Natural‐fibre‐mat‐reinforced thermoplastic (NMT) composites based on flax fibre mats and a Polypropylene (PP) matrix were manufactured using (i) a film‐stacking method and (ii) a paper making process. The influence of fibre length and fibre content on stiffness and strength is reported and compared with data…
We have investigated the effect of the increase of the one-electron ${e}_{g}$ bandwidth $(W)$ on the ferromagnetic and antiferromagnetic transitions in charge ordered ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ by substituting bigger ${\mathrm{Sr}}^{2+}$ ions for ${\mathrm{Ca}}^{2+}$ ions through electr…
Other| February 01, 1998 Single-crystal Raman spectroscopy study of dickite Clifford T. Johnston; Clifford T. Johnston Purdue University, Crop, Soil and Environmental Sciences, West Lafayette, IN, United States Search for other works by this author on: GSW Google Scholar Jozef Helsen; Jozef Helsen Search for other wor…
Hydrogen atoms have been produced at 77 K in single crystals of potassium dihydrogen phosphate (${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ or KDP) using either 60-kV x rays or the fourth harmonic (266 nm) of a pulsed Nd:YAG (yttrium aluminum garnet) laser. The electron-paramagnetic-resonance spectrum from these hydrogen ato…
In order to reveal the band structure of cubic boron phosphide a photo- and electroreflectance study has been undertaken. Towards this end, epitaxial thin films of this III–V semiconductor are grown on silicon (100) by chemical vapor deposition. Both modulated reflectance techniques reveal a critical point at 4.25 eV.…