Materials Literature
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We present experimental results for [1–3] magnetostrictive composites containing a 20% volume-fraction of Terfenol-D coarse particles (≫1 μm) suspended in a nonmetallic binder. Results from magnetostrictive strain and magnetoelastic measurements are provided for particle distributions that differ in particle size and…
Polarized Raman spectra from microcrystals of ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ were studied as a function of temperature, excitation photon energy, and scattering configuration. At temperatures below the transition from ferromagnetic metallic phase to antiferromagnetic insulating charge- and…
This article describes an experimental and mathematical modelling study of the effect of rotating magnetic fields during solidifcation on the resulting microstructure. Cylindrical castings of aluminum alloy A356 are made by vertical solidification from a chill block, under the influence of a coaxial rotating magnetic…
LaCoO 3 and La 0.8 Ca 0.2 CoO 3 ceramics show a nonelastic stress–strain behavior during four‐point bending experiments where hysteresis loops are observed during loading–unloading cycles. Permanent strain is stored in the material after unloading, and a mechanism related to ferroelastic domain switching in the rhombo…
Fully dense SiC ceramics with high strength at high temperature were obtained by hot‐pressing and subsequent annealing under pressure, with AlN and Er 2 O 3 as sintering additives. The ceramics had a self‐reinforced microstructure consisting of elongated SiC grains and a grain‐boundary glassy phase. The strength of th…
The influence of Ca and Ba modification on the ferroelectric properties of SrBi 2 Ta 2 O 9 (SBT) was investigated using dense ceramics, and their crystal structures were analyzed by the Rietveld method through high-resolution neutron powder diffraction. The 30% substitution of Sr by a larger Ba lowered the Curie tempe…
The synthesis, spectroscopic properties, and electrochemistry of six different alkyl- and aryl-substituted Co(III) corroles are presented. The investigated compounds contain methyl, ethyl, phenyl, or substituted phenyl groups at the eight beta-positions of the corrole macrocycle and four derivatives also contain a phe…
Transparent self-standing films of titanium-containing (Ti/Si ratio of 1/50) silica−surfactant mesostructured materials, having a thickness of ca. 50 μm and a lateral size of a few centimeters, were synthesized by the solvent evaporation method from tetramethoxysilane, vinyltrimethoxysilane, titanium tetraisopropoxide…
The continuous advancement of microelectronics in all fields of technology has become a basic fact of our daily life. Increasingly complex tasks are performed by computers, requiring more memory capacity and faster processing speeds. This constant need to develop more highly integrated microchips is expressed by Moore…
Piezoelectric properties of grain-oriented bismuth layer structured compound CaBi 4 Ti 4 O 15 ceramics and their temperature dependencies were studied. The grain-oriented CaBi 4 Ti 4 O 15 ceramics were fabricated by the templated grain growth method. The highly preferentially (00 l ) oriented CaBi 4 Ti 4 O 15 ceramics…
Abstract Membrane reactors enable synthesis‐gas production from methane and air while avoiding the need for separation of the nitrogen either before or after the reaction. A stable membrane was developed by spray deposition of a dense thin film of La 0.5 Sr 0.5 Fe 0.8 Ga 0.2 O 3 − δ on a high‐purity porous α‐alumina t…
A novel photo-crosslinkable polymer liquid crystal (PCP-LC), in which a high molecular orientation has been achieved by irradiation with UV light and thermal treatment, is presented. Two types of optical birefringent film have been obtained whereby the orientational order is controlled by the irradiation angle and pol…
Composite capsules containing low molecular weight species together with charged macromolecules have been prepared both in aqueous and organic solutions. Dyes were used as building blocks to quantify the adsorption. The Figure shows a tapping mode scanning force microscopy image of capsules consisting of poly(styrene…
Dielectric properties of carbon-incorporated silicon oxide (SiOC) films deposited by plasma enhanced chemical vapor deposition (PECVD), using a bis-trimethylsilylmethane precursor, were compared with the dielectric properties of silicon oxide thermally grown in a furnace (thermal oxide) and also with oxide deposited b…
Oxygen vacancy behaviors in Ni-doped barium strontium titanate (BST) ceramics have been observed through thermally stimulated current (TSC) measurements up to 200°C. The set of observations confirmed that the vacancies drift due to a high electric field at an elevated temperature to pile up under the cathode electrode…
The surfaces of bimetallic Cu–Co/SiO2 catalyst with 1 Cu:2 Co atomic ratio has been studied focusing on the determination of bimetallic phase thickness and its distribution using a mathematical formalism from X-ray photoelectron spectroscopy (XPS) intensities. X-ray diffraction analysis indicated a Cu–Co alloy formati…
In this study Y2O3 thin films were etched with an inductively coupled plasma. The etch rate of Y2O3 and the selectivity of Y2O3 to YMnO3 were investigated by varying the Cl2/(Cl2+Ar) gas mixing ratio. The maximum etch rate of Y2O3 and the selectivity of Y2O3 to YMnO3 were 302 Å/min and 2.4, respectively, at a Cl2/(Cl2…
Transparent and highly oriented (Sr, Ba)(Nb, Ta) 2 O 6 (SBNT) thin films have been synthesized by a chemical solution deposition method. A homogeneous and stable SBNT precursor solution was prepared by controlling the reaction of metal alkoxides in solution and by optimizing the additive as a stabilizing agent. Tantal…
This work describes the comparison of experimental measurements of electron beam spread in the environmental scanning electron microscope with model predictions. Beam spreading is the result of primary electrons being scattered out of the focused beam by interaction with gas molecules in the low-vacuum specimen chambe…
Abstract Centrifuge extraction and Rotavapor recovery were used to determine the effect of solvent type (trichloroethylene and four n-propyl bromide products) on recovered asphalt binder properties. Mix variables included three binders mixed with each of two aggregate sources (one gradation). When recovered binder pro…