Materials Literature
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We describe a novel procedure to determine a phase coexistence line by computer simulation. The procedure combines elements of the Clausius–Clapeyron integration technique with free-energy difference calculations. As an application, the phase diagram of a simple hard-core Yukawa model of a charge-stabilized colloid, w…
The electronic level structure and dephasing dynamics of InP nanocrystals in the strong quantum-confinement regime are studied by two complementary techniques: nanosecond hole burning and the femtosecond three-pulse photon echo. Hole burning yields the homogeneous electronic level structure while the photon echo allow…
The atomic geometry of the (110) surface of CdTe has been determined by low-energy positron diffraction (LEPD). Diffracted intensities of 13 inequivalent beams were measured at sample temperatures of 110 K over an energy range 20 eV\ensuremath{\leqslant}E\ensuremath{\leqslant}140 eV. These intensity energy profiles we…
We have performed neutron scattering experiments on single crystals of La 2 NiO 4+δ (δ=0.11, and 0.125) to study the effect of oxygen doping on the structural and magnetic properties. The degree of the excess oxygen order strongly influences the local crystal structure and interlayer magnetic correlation. The intralay…
A new damage function suitable for metals under dynamic loading, based on the physical statistics of microvoids in metals and the law of conservation of energy, is presented in this article. This new damage model has a sound physical or theoretical foundation and fewer adjustable or empirical parameters than most exis…
The adhesion of platelets to a series of segmented polyurethanes having sulfonate groups in the hard segment is reported. The polyurethanes were synthesized using sulfonated chain extenders of different structure. Analogous control materials without sulfonate groups also were studied. Adhesion was measured in vitro us…
A recently developed comparative interferometric method for the determination of the refractive index at high pressures is applied to NaF, NaBr, NaI, KCl, KBr, KI, RbCl, RbI, CsCl, CsBr, and CsI. In the studied pressure range up to 12 GPa, the potassium and rubidium halides show a polymorphic phase transition from NaC…
A series of zinc-blende CdTe quantum dots in glass was investigated using Raman scattering and luminescence. The dot size was controlled by varying the annealing conditions. Luminescence was employed as a probe for quality of the sample and its adequacy for resonance. Resonant Raman spectra at the lowest confined ener…
The photoluminescence (PL) in as-received and milled Si and ${\mathrm{SiO}}_{2}$ powder is reported. The Si and ${\mathrm{SiO}}_{2}$ powder is characterized by chemical analysis, Raman scattering, x-ray photoelectron spectra, infrared absorption, x-ray diffraction, and differential thermal analysis. The results indica…
A series of experiments have been conducted on metals subjected to planar impact loading in which a biaxial stress state and a uniaxial strain state is induced. Longitudinal and transverse stresses have been measured in copper, iron, and mild steel, using manganin stress gauges. The results have been used to calculate…
Experiments were conducted to investigate the mechanisms of damage to brittle materials by liquid–jet impact as seen in cavitation or simulated rain erosion. In this work, a liquid–jet of 3 mm in diameter and speed ca. 600 m s-1, produced using the single–impact jet apparatus (SIJA), was impacted on a polymethylmethac…
Electronic-structure calculations are performed, within the local-density approximation to the density-functional theory, using the full-potential linear muffin-tin orbital method to understand the relation between structural and electronic properties of ${\mathrm{ReO}}_{3}$ , ${\mathrm{WO}}_{3}$ , and the stoichiomet…
A detailed structural and morphological investigation has been carried out by conventional transmission electron microscopy, high resolution electron microscopy and nanodiffraction methods on vanadium oxide films obtained by reactive rf sputter at a high power discharge (1000 W) and different O2/Ar ratio. Electrical c…
A theoretical expression for the brightness of powder phosphor is derived in order to investigate the effects of phosphor’s properties on low-energy cathodoluminescence. It contains the particle size, surface recombination rate, lifetime of holes, carrier diffusion coefficients, and anode voltage. As such, it can be a…
A carbon-nitride compound with defect zincblende structure (P4̄3m) has been discovered in samples prepared by a chemical precursor route. Crystallographical (high-resolution electron microscopy and electron nanodiffraction) and electron energy loss measurements has been performed to identify the material as cubic zinc…
The effects of encapsulated metal salts on poly(DL-lactide-co-glycolide) (PLGA) water uptake and degradation properties were investigated in this work. Salts of varying aqueous solubility characteristics were incorporated into PLGA films either as particles or by codissolution in polymer solutions. Polymer films were…
Epitaxial ${\mathrm{VO}}_{2}$ layers have been grown on the ${\mathrm{TiO}}_{2}$(110) rutile surface up to thicknesses of 5 ML. These ultrathin films have been characterized by means of x-ray photoelectron spectroscopy (XPS), x-ray photoelectron diffraction (XPD), low-energy electron diffraction (LEED), and ultraviole…
We report Hall coefficient (${\mathrm{R}}_{\mathrm{H}}$ ) and magnetoresistance (\ensuremath{\Delta}\ensuremath{\rho}/\ensuremath{\rho}) measurements on thin films of aligned carbon nanotubes. ${\mathrm{R}}_{\mathrm{H}}$ is positive in the whole temperature range (1.7--300 K) showing the predominance of hole transport…
On measuring the dependence of the magnetic susceptibility of (CH 3 ) 2 CHNH 3 CuCl 3 on the temperature, we find that this compound forms ferromagnetic and antiferromagnetic alternating linear chains with S =1/2. The magnetic susceptibilities observed in external fields applied along three different surfaces of an as…
We have analyzed the mechanisms and the efficiency of the 1.54 μm electroluminescence from Er-doped crystalline Si. Optical doping of a 0.25 μm deep p+−n+ junction was achieved by multiple Er and O implants which realize a uniform concentration of 1019 Er/cm3 and 1020 O/cm3 from 0.2 to 0.9 μm from the surface. It has…