Materials Literature
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We deposited epitaxial Ba0.4Sr0.6TiO3 (BST) films via laser ablation on MgO and LaAlO3 (LAO) substrates for tunable microwave devices. Postdeposition anneals (∼1100 °C in O2) improved the morphology and overall dielectric properties of films on both substrates, but shifted the temperature of maximum dielectric constan…
We report a dynamical study on the photoinduced cooperative changes of the spin configurations in single crystals of the organometal spin-crossover complex. In the photoswitching process between low- and high-spin states, nonlinear characteristics such as thresholdlike behavior, incubation period, and phase separation…
The optical properties of clusters with metallic spherical particles embedded in an insulating matrix are studied. A theoretical approach is proposed for the calculation of the macroscopic dielectric response for a collection of spheres at random positions embedded in a homogeneous medium. While accounting for the dip…
We study the domain structure in ferroelectric thin films with a "passive" (nonferroelectric) layer at the interface between the film and electrodes. An abrupt transition from a monodomain to a polydomain state has been found with the increase of the passive layer thickness d. The domain width changes very quickly at…
The fracture of materials is a catastrophic phenomenon of considerable technological and scientific importance. Here, we analysed experiments designed for industrial applications in order to test the concept that, in heterogeneous materials such as fiber composites, rocks, concrete under compression and materials with…
Photoluminescence (PL) properties of ZnO films grown on CaF2(111) with a low-temperature buffer layer by plasma assisted molecular beam epitaxy are investigated, in which lattice misfit tensile strain is expected to be compensated by the thermal compressive strain. The low-temperature buffer layer is further introduce…
The phase diagram of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$, as a function of hole doping $x$ and tetragonal distortion $c/a$, which consists of ferromagnetic (FM), A-, C-, and G-type antiferromagnetic (AF) states, is obtained by the first-principles band structure calculations. Effects…
Ball milling is an important method for the preparation of materials both for the investigation of fundamental physical properties and for a number of possible commercial applications. In the present report, the basic principles of ball milling are discussed. This includes a brief overview of experimental techniques a…
ICRP 74 and ICRU 57 recommended conversion coefficients for use in radiological protection for electrons and photons of energies up to 10 MeV and for neutrons up to 180 MeV. For various purposes (radiation protection around high energy accelerators, shielding calculations, air crew dose assessment, space activity) con…
The problem of localized superconductivity has motivated the preparation of Mg 1− x Cu x O solid solutions with NaCl structure and 0.01≤ x ≤0.20, as well as a study of the magnetization and magnetic susceptibility χ in the 2–400 K temperature range and in magnetic fields of up to 5 T. The temperature dependence of χ i…
Characteristics of complex defects in semiconductors are calculated by the method of minimizing the free energy for the actual crystal. The influence of the electron subsystem on the impurity solubility is considered. The modeling of solidus curves is carried out in terms of binary association and clustering.
To elucidate the secondary electron emission from tungsten surfaces of various work functions, as experimentally prepared by scandium deposition onto a W(100) surface, a Monte Carlo simulation of energy distribution of secondary electrons, N S ( E ), emitted from tungsten surfaces with various work functions has been…
Dielectric permittivity along the [111] direction has been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 (PMN-33%PT). A sharp ferroelectric phase transition was observed near 425 K and 429 K for cooling and heating processes, respectively. As temperat…
This paper reviews our recent research on the solidification of several alloy systems under the action of electromagnetic field. We have developed a new solidification process, namely Electromagnetic Centrifugal Casting, by introducing a direct current magnetic field to centrifugal casting. The fundamentals of this ne…
Organoaxial gastric volvulus was detected on a I-131 whole-body scan in a 79-year-old man with thyroid cancer with metastatic disease within his lower cervical and upper thoracic spine. He had recently undergone thyroidectomy, debulking of his metastatic disease, and many I-131 treatments. During an additional I-131 a…
Abstract Ammoniation of montmorillonites pillared with polyhydroxo-complexes of Al was performed in flow conditions at 773–1073 K and monitored by IR spectroscopy. Interaction of the clay with ammonia revealed exchange of terminal and bridging -OH groups by NH 2 -, NH- and N- species depending on the reaction temperat…
In an atomic force microscopic image of the main-chain- and the side-chain-type polyimide surfaces, we have observed a variation of the surface morphology to use the rubbing depths and the rubbing times. On the rubbed polyimide surface, the polymer clusters are aligned in long chains along the rubbing direction. The t…
Abstract Continuous hydrolytic depolymerization of polyethylene terephthalate (PET) resin at high temperature and pressure was carried out in a co-rotating twin screw extruder. In this novel process, hydrolysis is achieved by injection of saturated steam at high pressure. Optimum conditions occur at relatively low scr…
The changes of electrochemical parameters on vanadium in 0.5 M NaCl solution at different potentials ranging from − 0.155 (Ecorr) to 1000 mV (SCE) are studied using the AC impedance method. It is found that the charge-transfer resistance decreases with increasing potential. At potentials ≤ 500 mV both the metal charge…
A diffusion-based numerical model was developed to predict the life of cylindrical structural elements suffering hydrogen embrittlement in the presence of residual stress fields. The formulation of the model is based on stress-assisted hydrogen diffusion from the external environment into the metallic material and on…