Materials Literature
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Some results of magnetostriction and magnetization measurements are presented on a small representative sample of four specimens from an original study of over one hundred specimens of the Tb-Dy-Fe alloy which we have measured in recent years. The results of these investigations show a progressive improvement in strai…
The crystal of Sc(NH 3 OH)(SO 4 4) 2 .1.5H 2 O is built up from scandium, sulfate and hydroxylammonium ions, and from two crystallographically different molecules of water. The structure can be described as comprising chains of octahedrally and tetrahedrally arranged 0 atoms around Sc and S atoms, respectively. These…
We determined the paraelectric crystal structure of RbHSO 4 using X-ray diffraction intensities collected by an automatic four-circle diffractometer. One of the two independent SO 4 ions takes two molecular arrangements with equal probability while the other SO 4 ion occupies a single site. The ferroelectric structure…
Huge spiral crystals of potassium dichromate (K 2 Cr 2 O 7 ) have been found to grow three-dimensionally in a gelatin medium when gelatin containing K 2 Cr 2 O 7 was dried slowly in a test tube at a low temperature. These spirals were all right-handed, and their widths, axial pitches and lengths were 2–3 mm, 5–6 mm an…
We present a method for the calculation of the chemical potential of a liquid or solid using molecular dynamics or Monte Carlo computer simulations of the material. Like several previously presented methods, it is based on the insertion and deletion of particles from the system. It is based on what we call a ‘‘bicanon…
Titration of F-actin with calponin causes the formation of two types of complexes. One, at saturation, contains a lower ratio of calponin to actin (0.5:1) and is insoluble at physiological ionic strength. The another is soluble, with a higher ratio of calponin to actin (1:1). Electron microscopy revealed that the form…
We present theoretical results for the electronic structure of graphite using a full-potential linear muffin-tin-orbital method. The calculations are performed at ambient pressure and at hydrostatic pressures of 5 and 10 GPa. Our ambient pressure results are in agreement with recent independent calculations as well as…
Expitaxial ferroelectric BaTiO3 thin films have been grown on (001) MgO and MgO-buffered (001) GaAs substrates by pulsed laser deposition to explore the effect of substrate lattice parameter. X-ray-diffraction studies showed that the BaTiO3 films on both MgO single-crystal substrates and MgO-buffered (001) GaAs substr…
Carbon nitride thin films on Si(100), with N concentrations ranging from 37% to 45% have been synthesized by pulsed laser ablation of graphite under a low-energy nitrogen-ion-beam bombardment. High-energy non-Rutherford backscattering has been employed to measure the atomic ratio of N to C in the films obtained. Elect…
It is shown that a pair of hexagonal dislocation structures can be used as a basis for understanding the herringbone pattern and the node networks that have been observed in the structure of several (111) metal surfaces and overlayers. The hexagons are composed of the dissociation patterns of perfect edge dislocations…
The electrical transport properties of simultaneously deposited, B-doped homoepitaxial and polycrystalline diamond thin films have been evaluated by Hall-effect and resistivity measurements over a temperature range of 80–600 K. The same films were later characterized by scanning electron microscopy, secondary-ion-mass…
The structure and electronic properties of bare and H-terminated C(100)-2\ifmmode\times\else\texttimes\fi{}1 surfaces have been studied by ab initio molecular dynamics. Stable 2\ifmmode\times\else\texttimes\fi{}1 structures were found for both clean and monohydride-terminated surfaces. The 1\ifmmode\times\else\texttim…
The infrared-absorption spectra of silicon dioxide have been studied for many years and most of the peaks have been identified. During the investigation of silicon dioxide deposited by the liquid-phase-deposition technique, an interesting phenomenon was observed. It was found that the intensity ratio between the side…
The spontaneous polarization and electrostatic potential in ferroelectric films with domain structures have been calculated based on phenomenological theory. The polarization is reduced at the film surface due to a depolarizing field. The domain width, free energy, and Curie temperature as functions of film thickness…
The study of the formation of Sulfur Hexafluoride (SF6) dissociation products under point to plane corona discharges was carried out at PSF6=300 kPa using different discharges production conditions (50 Hz ac voltage, dc negative polarity voltage, mean discharge current intensity Ī varying between 2 and 45 μA for dc n…
We report optical measurements of ${\mathrm{NdNiO}}_{3}$ that undergo a phase transition from a paramagnetic metal to an antiferromagnetic insulator at 200 K (=${\mathit{T}}_{\mathit{c}}$). The opening of a charge gap is observed in the optical conductivity spectrum [\ensuremath{\sigma}(\ensuremath{\omega})] below ${\…
The quantum-confinement effect is demonstrated in the luminescence of the ${\mathrm{CsPbCl}}_{3}$-like aggregated phase in ${\mathrm{Pb}}^{2+}$-doped CsCl single crystals. Namely, microscopic excitonic superradiance is considered to explain the observed picosecond decay kinetics of the aggregated-phase emission band a…
We report the first experimental observation of two chemisorption states for molecular oxygen on a TiO2(110) surface containing anion vacancy sites. The first molecular species can be photoactivated to oxidize coadsorbed CO to CO2 (α channel) and undergoes slow photodesorption. The second molecular oxygen species only…
Passive chemical-vapor-deposited diamond layers have the potential to improve thermal conduction in electronic microstructures because of their high thermal conductivities. The thermal resistances for conduction normal to the boundaries of diamond layers, which must be small in order to realize this potential, have no…
The nature of an UV cathodoluminescence band, which can appear in both boron-doped high-pressure high-temperature (HPHT) synthetic diamond and boron-doped diamond grown by chemical-vapor-deposition (CVD) techniques, is investigated. The band has a peak energy at 4.6 eV (270 nm), a full width at half-maximum of ∼0.4 eV…