Materials Literature
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For infiltration of a molten salt into porous zirconia (relative densities = 0.56 to 0.88), the infiltration depth was found to be a function of both infiltration time and initial compact density. The intrinsic liquid permeability of the porous Y‐TZP was determined by extrapolation of gas permeability data. Permeabili…
A scaling relation is used to estimate the interfacial tension of phase-separated colloidal dispersions. Conditions are focused on where (i) the strong segregation limit applies, (ii) the interfacial structure is simple, and (iii) the phase separation is entropy driven. Comparison with experimental work on colloid−pol…
Five layered Sr2Bi4Ti5O18 has been prepared in the ceramic form with a view to studying its electrical properties. X-ray and microstructural studies were employed for physical characterization. Detailed electrical property measurements were undertaken so as to understand the basic transport physics of this compound. T…
Fine‐grained (<1 μm) silicon carbide ceramics with high strength were obtained by using ultrafine (∼90 nm) β‐SiC starting powders and a seeding technique for microstructural control. The microstructures of the as‐hot‐pressed and annealed ceramics without α‐SiC seeds consisted of fine, uniform, and equiaxed grains. In…
“Push–pull” nonlinear optical (NLO) chromophores—which consist of an electron-donating group and an electron-withdrawing group connected by a π-conjugated system—with optimized hyperpolarizability tend to lead to materials with reduced stability, solubility, or transparency. It is demonstrated that molecular engineeri…
We obtain analytical expressions for the total magnetic moment and the static spin-correlation functions of the classical Heisenberg model for ultrasmall systems of spins (unit vectors), that interact via isotropic, nearest-neighbor (n-n) exchange and that are subject to a uniform dc magnetic field of arbitrary streng…
This handbook is a comprehensive compilation of physical, electrical, thermal and mechanical properties of pure metals and the effects of fabrication methods, heat treatment, temperature and other factors on these properties. It contains more than 250 quick-reference tables and figures, which are accompanied by explan…
Abstract Amorphous derivates prepared by aqueous reaction of various aluminosilicate clay minerals with concentrated KF solution at 80–110°C were studied for their gas adsorption properties. The four clay minerals studied are halloysite, a well-crystallized kaolinite, a poorly crystallized kaolinite, and a montmorillo…
Low energy ion-induced secondary electron emission from the surface of thin (500–5000 Å) polycrystalline MgO films has been investigated with various noble gas ions at energies ranging from 45 to 300 eV. The dependence of secondary electron emission coefficient γi on the type and energy of ions is reported and interpr…
The transition with increasing x in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3}$ from an antiferromagnetic, p-type polaronic conductor to an n-type metal with an enhanced Pauli paramagnetism was investigated by monitoring changes in structure, magnetic properties, and, under different hydrosta…
The influences of the Nb/Co ratio on electrical properties, densification behavior, and microstructural evolution were investigated on ceramics in the ternary system BaTiO 3 ‐Nb 2 O 5 ‐Co 3 O 4 . Temperature‐stable dielectrics were obtained using either a large amount of Nb + Co or a large Nb/Co ratio. The sintering c…
Nanocrystalline silicon carbide that was doped with boron and carbon (B,C‐SiC) and contained 1 wt% boron additive and 3.5 wt% free carbon was fabricated using hot isostatic pressing under an ultrahigh pressure of 980 MPa and a temperature of 1600°C. The average grain size of the material was 200 nm. The tensile deform…
Up to 50 vol% of TiB 2 , TiC 0.5 N 0.5 , TiN, or TiC was added to Y 2 O 3 ‐stabilized tetragonal ZrO 2 polycrystals (Y‐TZP) and hot pressed under vacuum. The influence of the type of secondary phase on the microstructure and mechanical properties was studied, as a function of the hot‐pressing temperature. The influenc…
Atomistic molecular dynamics simulations are performed to analyze the diffusion of phenol molecules in a bisphenol-A-polycarbonate melt in the zero concentration limit for the temperature range from 500 K to 640 K. The transition from a hopping diffusion to a continuous diffusion is observed. Visualization of the diff…
Octaanionic meso -tetra(3,5-dicarboxylatophenyl) porphyrin 1 was adsorbed to gold electrodes at pH 12 and stayed there after repeated washing with 10 - 2 M KOH. The fluorescence on sputtered gold surfaces amounted to 10% of the intensity observed on an organic subphase. Addition of 10 - 6 M aqueous solutions of the ma…
The interwoven and branched, regular, cubic pore structure of the molecular sieve MCM-48makes it of interest for catalytic and separations applications. A new, easy, fast, and flexible preparation method for metal-containing MCM-48is presented and the characteristics of the resulting spherical particles are discussed.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFormation and Characterization of a High-Spin Heme-Copper Dioxygen (Peroxo) ComplexReza A. Ghiladi, Telvin D. Ju, Dong-Heon Lee, Pierre Moënne-Loccoz, Susan Kaderli, Yorck-Michael Neuhold, Andreas D. Zuberbühler, Amina S. Woods, Robert J. Cotter, and Kenneth D. KarlinV…
By using molecular dynamics simulations on a large number of hard spheres and the Voronoï tessellation we characterize hard-sphere systems geometrically at any packing fraction eta along the different branches of the phase diagram. Crystallization of disordered packings occurs only for a small range of packing fractio…
A temperature-dependent UV–visible spectrophotometric study on [Eu(DO3A)(H2O)n] proved the presence of a hydration equilibrium (n = 1, 2), strongly shifted towards the bisaqua species [DO3A = 1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane]. The thermodynamic parameters and the reaction volume were determined…
Kinetics of direct α/β-Si3N4→α-SiAlON transformations, reverse α′-SiAlON→β′-SiAlON transformation, and the formation of intermediate phases were investigated for SiAlON ceramics with rare earth stabilizing cations. It was determined that smaller cations (Yb), and α-Si3N4 starting powders lead to faster Si3N4→α′-SiAlON…