Materials Literature
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We investigate the problem of total transmission at the interface separating an isotropic regular material and an indefinite medium [Phys. Rev. Lett.90, 077405 (2003)] in which not all of the principal elements of the permeability and permittivity tensors have the same sign, for TE- and TM-polarized electromagnetic wa…
Perovskite Ba 0.5 Sr 0.5 TiO 3 (BST) thin films, with thickness of about 350 nm, have been epitaxially grown on (001) LaAlO 3 substrates by pulsed-laser deposition. The good crystallography and epitaxy characteristics were confirmed using x-ray diffraction and transmission electron microscopy (TEM). The dielectric pro…
By doping an inorganic compound with two specific types of trivalent rare-earth impurities the controlled creation of electron- and hole-trapping centres is possible. This is demonstrated with experimental data on LiLnSiO 4 :Ce 3+ , Sm 3+ , Ln = Y or Lu. After exposure to ionizing radiation electrons are captured by S…
Measurements of the response of thermoluminescent (TL) detectors after gamma ray doses high enough to observe signal saturation provide input to microdosimetric models which relate this gamma-ray response with the energy response after low doses of photons (gamma rays and low-energy X rays) and after high-LET irradiat…
The spin-crossover complex [Fe(teec)(6)](ClO(4))(2) (teec = chloroethyltetrazole) exhibits a 50 % incomplete spin crossover in the temperature range 300-30 K. Time-resolved synchrotron powder diffraction experiments have been carried out to elucidate its structural behavior. We report crystal structure models of this…
The interaction of edge plasma with material surfaces raises key issues for the viability of the international thermonuclear reactor (ITER) and future fusion reactors, including heat-flux limits, net material erosion and impurity production. After exposure of the graphite divertor plates to the plasma in a fusion devi…
The adsorption of hydrogen atoms on the (0001) basal plane of graphite is studied using periodic first principle density functional formalism. A model structure for the hydrogen-saturated surface is proposed according to the periodic boundary conditions. Quantum molecular dynamics using the Nosé–Hoover thermostat is c…
In this work we present the synthesis, characterisation and the thermoluminescence (TL) response of nanoporous carbon doped aluminium oxide Al2O3:C produced by anodic oxidation of aluminium in organic and inorganic solvents. The X-ray and scanning electron microscopy (SEM) measurements reveal that the synthesised samp…
The use of tin dioxides, antimony trioxides, and their mixture as flame retardants for flexible PVC systems is considered as a means of enhancing the ability of flame retardancy. The flame retardant property of tin dioxides is studied through the limiting oxygen index (LOI) test, char yield, DTA–TG, SEM, and elemental…
Abstract Heteropoly acids (HPA), such as tungstophosphoric acid (H 3 PW 12 O 40 · x H 2 O) (HPW), molybdophosphoric acid (H 3 PMo 12 O 40 · x H 2 O) (HPMo) and tungstosilicic acid (H 4 SiW 12 O 40 · x H 2 O) (HSiW) were supported on mesoporous silica such as MCM‐41, FSM‐16 and SBA‐15 by the impregnation method to enha…
Microcellular foams (MCFs) of polycarbonate (PC) with relative densities of 0.9 and 0.7 (MCF-0.9 and MCF-0.7) are produced by solid-state foaming. Microstructural characterization shows that they have bi-modal distribution of spherical cells, with median cell sizes of 3–4 mm and 6–9 mm for both cell populations. Tensi…
Abstract Fluorine‐doped zinc oxide thin films (ZnO:F) were deposited on sodocalcic glass substrates from an aged solution using a chemical spray technique. The effect of substrate temperature ( T S ) on the morphological, optical, and nonlinear optical (NLO) properties of the ZnO:F thin films was studied. These films…
A completely optical, non-destructive imaging of tracks in a fluorescent crystal provides a new way to detect and to assess doses from heavy charged particles and neutrons. The technique combines confocal fluorescent microscopy with a new radiation-sensitive, luminescent material based on aluminium oxide single crysta…
In this work a successful method for producing high-aspect-ratio nanopatterned single-crystal TiO 2 is presented. The method used is based on nanolithography involving swift heavy ion bombardment through a porous anodic alumina mask. Nanopatterning of large areas allows for fabrication of new devices, for example, pho…
Using a ${\mathrm{SrTiO}}_{3}(001)$ barrier and ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}(001)$ electrodes, we study the case of coherent spin-polarized tunneling of electrons that exhibit a symmetry mismatch with respect to the lower electron barrier height. Due to this mismatch, electrons with energy…
Considerable efforts have been devoted recently to synthesizing diluted magnetic semiconductors having ferromagnetic properties at room temperature because of their technological impacts for spintronic devices. In 2001 successful growth of GaMnN films showing room temperature ferromagnetism and p-type conductivity was…
A real-time optically stimulated luminescence (OSL) dosimetry system for potential in vivo use during radiotherapy treatments is proposed. Single-crystal europium-doped KBr samples were grown in a Bridgman furnace, and characterised using optical absorption techniques. An algorithm for the processing of the OSL signal…
Simultaneous interaction of low-energy ions and atomic hydrogen—a process named chemical sputtering—causes erosion of C:H surfaces which is significantly higher than the sum of the individual processes—chemical erosion due to atomic hydrogen alone and physical sputtering due to ions. Above that, this process occurs al…
A new ternary member, SbPS4, has been added to the growing inorganic nanotube family. This material naturally forms bundles of long, single wall nanotubes.
Single crystals of l -threonine have been grown from aqueous solutions of different pH values. The crystal grown from the solution of isoelectric pH (PI) was found to have the best linear and nonlinear optical properties. The optical quality of l -threonine was improved greatly in the case of the crystal grown at PI.…