Materials Literature
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Magnetization measurements in high-pulsed magnetic fields have revealed the presence of magnetic anisotropy in the hard basal plane of a single crystal of Nd2Fe14B. A discontinuity in the magnetization occurs when the magnetic field is applied along the [100] direction in the hard basal plane below 220 K while there i…
The microscopic structure of the paramagnetic anion antisite defect in semi-insulating GaAs was determined by optically detected electron-nuclear double resonance (ODENDOR). It is an arsenic-antisite--arsenic-interstitial (${\mathrm{As}}_{\mathrm{Ga}}$-${\mathrm{As}}_{\mathrm{i}}$) pair. It is shown, by optically dete…
Third harmonic generation (THG) has been performed in reflection from thin polycrystalline films of chloro-gallium and fluoro-aluminum phthalocyanines. By comparison to THG from the 100 surface of silicon, the values of χ(3) are estimated to be 2.5×10−11 and 5×10−11 esu, respectively. The patterns of the molecular and…
${\mathrm{Nd}}_{1+\mathrm{\ensuremath{\epsilon}}}$${\mathrm{Fe}}_{4}$${\mathrm{B}}_{4}$ crystallizes with the tetragonal ${\mathrm{Sm}}_{1+\mathrm{\ensuremath{\epsilon}}}$${\mathrm{Fe}}_{4}$${\mathrm{B}}_{4}$ structure type. It is characterized by two interpenetrating metal substructures with incommensurate translatio…
Amorphous thin films of GeTe were exposed to excimer-laser pulses of fluences between 3 and 27 mJ/${\mathrm{cm}}^{2}$. Transient reflectivity and conductivity were simultaneously recorded during the laser interaction with a time resolution of a few nanoseconds. A rapid increase in R and \ensuremath{\sigma} due to lase…
Resonant photoemission studies have been performed on the 3d transition metals Cr, Mn, Fe, and Co. No valence-band satellites are observed for clean evaporated films of these materials. Previously reported structures at binding energies around 6 eV are thought to be due to trace amounts of oxygen contamination. This i…
The chemical nature of the adhesive interface between Cr and three polymers has been investigated using synchrotron-radiation-excited photoemission from the polymer carbon and oxygen 1s core levels. Pyromellitic dianhydride--oxydianiline (PMDA-ODA) polyimide, an important polymer in the electronics industry, was studi…
A film of polymer on a five way cubic lattice is adsorbed on a smooth solid surface with one face exposed to the vacuum. The properties of the film are examined using a Monte Carlo algorithm which employs a combination of reptative and pseudokinetic ‘‘movements.’’ The film which forms exhibits three distinct layers, w…
In this paper we describe a general approach which allows the hypernetted chain (HNC) and Percus–Yevick (PY) integral equation theories to be solved numerically for fluids of hard nonspherical particles. Explicit results are given for fluids of hard ellipsoids of revolution and comparisons are made with recent Monte C…
The phase boundary between low-temperature dipole glass and ferroelectric states of K 1- x Li x TaO 3 is proposed to lie within 0.016 < x < 0.026 according to new optical birefringence, refractive index and dielectric permittivity data. The low- x glass phases are characterized by freezing temperatures T g < 40 K, whe…
The three-dimensional paracrystalline lattice factors Z(q)'s for a face-centered-cubic lattice and a body-centered-cubic lattice, in addition to a simple-cubic lattice, were calculated. The Z(q)'s thus calculated could reproduce the diffraction peaks at the characteristic positions for each cubic lattice system over a…
This paper uses the theory of atoms in molecules to investigate the origin of molecular dipole moments. The dipole moment is given by a sum over the net charge and first moment of every atom in a molecule. The first term leads to a charge transfer contribution μc, the second to an atomic polarization contribution μa.…
At a triple wetting line, the liquid-fluid tension may produce a wetting ridge in sufficiently soft solids. By employing variational methods, it has been shown that the solid strain combined with the Laplace pressure may modify contact angle equilibrium on a mesoscopic scale, situated between that of the molecular str…
The effects of isotopic substitution of the dispersed nitrogen atoms in synthetic diamonds, on several defect centres resulting from radiation damage and annealing, are described. Measurements have been carried out with standard 14 N-containing diamonds and diamonds doped with 15 N. New features have been found in the…
The author's work on the adsorption of plasma proteins using radiolabeling, hydrodynamic thickness measurements and elution/identification methods is reviewed. This work was motiviated by the need to understand the role of protein adsorption in thrombus formation following blood-foreign surface contact. Studies of sin…
The distinctive peak shapes observed in diffraction studies of the icosahedral phases of Al-Mn, Al-Li-Cu, and related alloys are shown to arise from a specific configuration of quenched phason strains in a grain. This configuration is determined by considerations of symmetry and continuity of the phason field. Al-Mn a…
The ability of proteins to influence a wide variety of processes that occur at interfaces is well recognized. The biocompatibility of clinical implants, mammalian and bacterial cell adhesion to surfaces, initiation of blood coagulation, complement activation by surfaces, solid phase immunoassays, and protein binding t…
The elastic constants of the cubic perovskite KZnF 3 have been measured from 4 to 300 K. Heat capacity data, C p , and elastic constants have been analysed and compared with the predictions from the lattice dynamics within a rigid-ion model. Phonon dispersion curves at different temperatures, heat capacity and Debye t…
Abstract Crystal structures and electrical properties of radical‐cation salts of the chiral organic donor TMET ( S , S , S , S ,‐bis‐(dimethylethylenedithio)tetrathiafulvalene) are described. Two structural types, 2:1 with octahedral anions Pf , AsF , SbF , I (incommensurate), and 3:2 with tetrahedral anions BF − 4 ,…
Copolymers of azo dye substituted acrylic monomer and methylmethacrylate are synthesized and their third-order nonlinear optical susceptibility χ(3) is evaluated using the third harmonic generation Maker fringe method. The χ(3) is 1.26×10−12 esu at 25.9 mol % azo dye monomer content in the copolymer. It is also shown…