Materials Literature
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By framework structures are meant materials consisting of relatively stiff units such as octahedra or tetrahedra, joined by shared oxygen (or other) atoms at the corners. Examples are ZrW 2 O 8 and many aluminosilicates. Rigid rotation of the units often gives a reduction of the volume or of some lattice constant as a…
Starting from the question, what fast electronic transport is based on, and why organic materials in general are more problematic in this respect than typical inorganic ones, methods are introduced that allow to measure the principal material property charge carrier mobility. Some representative experimental results a…
This paper presents the analysis of corrosion damages of metallic materials after application in waste fired boilers. The first part gives a description of corroded metallic specimens, collected from different grate fired plants in Germany and it will provide the base information for thermodynamic calculations and lab…
We revealed that the yield of SWNTs formed by Nd:YAG laser ablation depends on the target composition with yields following the order C x Ni y Co y > C x Ni y ≫ C x Co z . The SWNT bundles in the web formed when using the C x Ni y Co y target (web-C x Ni y Co y ) is thicker and longer than those in the web-C x Ni y .…
We have studied the effect of misfit strain on the microstructure and properties of ferroelectric lead zirconate titanate thin films. We have changed the misfit strain by varying the film thickness and studied the thickness effect on the domain formation of epitaxial PbZr0.2Ti0.8O3 (PZT) films grown by pulsed laser de…
High‐density lead zirconate titanate (PZT) ceramics have been successfully prepared by using a novel mechanochemical fabrication technique, which skips the phase‐forming calcination at an intermediate temperature that is always required in the industrial processes currently in use. The fabrication technique starts wit…
Recently, we reported on the improvement of hydrothermal stability of mesoporous silica using salts solutions (Ryoo, R.; Jun, S. J. Phys. Chem. B 1997, 101, 317. Ryoo et al. J. Phys. Chem. 1996, 100, 17718). The salt effect has been reinvestigated here to solve problems of poor reproducibility. It turned out that the…
Silicon nitride materials that contained different mixtures of sintering aids were investigated with respect to microstructure development and resulting fracture toughness. Postsintering annealing at 1850°C for various times was adopted in order to coarsen the respective microstructures. Although constant processing c…
The crystallization kinetics and mechanism of low‐dielectric, low‐temperature, cofirable CaO‐B 2 O 3 ‐SiO 2 glass‐ceramics were investigated. Crystalline phases formed during firing included calcium silicates (CaSiO 3 , Ca 3 Si 2 O 7 , Ca 2 SiO 4 ) and calcium borate (CaB 2 O 4 ), with crystalline wollastonite (CaSiO…
A novel segmented polyurethane/clay (PU/clay) nanocomposite based on poly(caprolactone), diphenylmethane diisocyanate, butanediol, and poly(caprolactone)/clay prepolymer was synthesized as evidenced by FTIR and X-ray diffraction studies. Poly(caprolactone)/clay (PCL/clay) prepolymer was first synthesized in a nanocomp…
This paper reports on the fabrication process of As-S-(Se)-based chalcogenide glass optical waveguides using three techniques: photolithography, laser beam writing, and ion implantation. The fabrication method of the bulk sulfide glasses and the processing of integrated devices are described and assessed in light of t…
We examine the network of forces to be expected in a static assembly of hard, frictionless spherical beads of random sizes, such as a colloidal glass. Such an assembly is minimally connected: the ratio of constraint equations to contact forces approaches unity for a large assembly. However, the bead positions in a fin…
We explore the possibility that polaronic distortions in the paramagnetic phase of ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ manganites persist in the ferromagnetic phase by considering the observed electrical resistivity to arise from coexisting field- and temperature-dependent polaronic and band-e…
The elastic field of complex shape ensembles of dislocation loops is developed as an essential ingredient in the dislocation dynamics method for computer simulation of mesoscopic plastic deformation. Dislocation ensembles are sorted into individual loops, which are then divided into segments represented as parametrize…
Hydrous ruthenium oxide‐coated titanium electrodes with high pseudocapacitance were prepared by cyclic voltammetry from an aqueous chloride solution in the −200 to 1000 mV range. The growth rate of , represented by (peak current) of the cyclic voltammograms, was constant up to cycle 120, but it decreased slightly betw…
BACKGROUND: Stealth liposomes hold promise as a mode of delivering cytotoxic agents selectively to tumors in cancer patients. The objective of this study was to determine whether stealth liposomal doxorubicin accumulates selectively in bone metastases based on clinical material obtained from two patients with breast c…
Understanding and predicting grain growth in Metallurgy is meaningful. Monte Carlo methods have been used in computer simulations in many different fields of knowledge. Grain growth simulation using this method is especially attractive as the statistical behavior of the atoms is properly reproduced; microstructural ev…
The oxide layer formed on the surface of a grain oriented silicon steel was characterized by SEM and EDS. 3% Si steel substrates were coated by two types of slurries: one formed by MgO and water and other formed by MgO, water and SrSO4. The ceramic films were evaluated by SEM, EDS and X-ray diffraction. Depth profiles…
The methodology of obtention of nanostructured glass, incorporated with lead compounds, obtained by sol-gel processing and the structural characterizations are presented. Specific surface area, porosity, pore morphology and pore size distributions of the gels were characterized with nitrogen sorption (BET) and mercury…
The oxidation of NiAl, NiAl-20at.%Fe and NiAl-30at.%Fe at 1000-1100 °C in air has been studied. Pure NiAl shows excellent oxidation resistance due to the formation of an Al2O3 layer. NiAl-20Fe also shows good oxidation resistance due to the formation of an Al2O3 scale on a b-phase substrate. Moreover, some nodules con…