Materials Literature
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The paraelectric and ferroelectric phases of betaine phosphite [BPI: (CH3)3 NCH2COO H3PO3] single crystals have been studied. The structure of BPI was determined at room temperature using x-ray and elastic neutron diffraction. Details of the ferroelectric transition and various low temperature properties were investig…
X-Ray diffraction measurements are reported of ceramic samples of the mixed-oxide system Ce1–xLaxO2–x/2 for 0<x<0.9, where x has been determined by EDXA. The solid-state reaction forms a highly crystalline product at an ageing temperature of 1200 °C. The solubility limit of La in the bulk CeO2 at this temperature has…
After reviewing the present status of research on the crystallization of flexible polymers some new perspectives in the field, as arising from ongoing research, will be presented.First, a brief resumé is given of the experimental material on chain-folded crystallization (here to be termed ‘main stream’) on polyethylen…
The surface mobility stress-corrosion cracking mechanism is based on the assumption that environmentally induced crack propagation is due to the capture of vacancies by the stressed lattice, at the tip of the crack. The present paper shows that the role of the environment is not only to change the surface self-diffusi…
Phase diagrams of the Al2O3-Yb2O3-SiO2 system and the properties of glasses in this system were investigated. The results are summarized as follows:(1) Phase diagram of the 3-component Al2O3-Yb2O3-SiO2 system at 1550°C and those of the three types of 2-component Yb2Si2O7-Al6Si2O13, Al1.25Yb0.75O3-SiO2 and Al1.44Yb0.56…
The outlook for improving the energy product of permanent magnets beyond the theoretical limit of 516 kJ/m 3 for Nd 2 Fe 14 B is discussed. Most promising are nanostructured two-phase magnets consisting of an aligned hard-magnetic skeleton phase possessing exceptionally high uniaxial anisotropy and a soft-magnetic pha…
Abstract Glass transition temperatures ( T g ) for dilute and concentrated glucose: fructose: water solutions have been determined by differential scanning calorimetry. The supplemented phase diagrams (glucose: fructose 1:4, 1:2, 1:1, 2:1, 4:1 (w/w)) are presented and from these the temperature ( T g ') and concentrat…
Investigations of 4-[(S, S)-2, 3 epoxyhexyloxy]-phenyl-4-(decyloxy)-benzoate by polarizing microscopy, the Cano-Grandjean method, optical rotation dispersion and UV-VIS spectroscopy reveal a cholesteric phase with temperature induced reversal of the helical twist. Switching time experiments in the Sc* phase show that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral discrimination in electronic energy transfer between dissymmetric lanthanide(III) and cobalt(III) complexes in solution: effects of ligand size, shape, and configuration in the acceptor complexesDavid H. Metcalf, James P. Bolender, Michael S. Driver, and F. S. Richard…
A new biomaterial has been developed by fixing native collagen with a polyepoxy compound (PC) fixative. In this study, bovine internal thoracic arteries were fixed with PC under various conditions to help understand the kinetics of the collagen-PC reactions and optimize the fixation process. At predetermined time inte…
Atomistic computer simulation techniques are used to investigate the role of key defect and transport properties of La2O3 that may be involved in the catalytic activity. The theoretical techniques are based upon efficient energy minimization procedures and Mott–Littleton methodology for accurate defect modelling. The…
The growth kinetics and morphology of polyethylene single crystals of a narrow molecular mass fraction (Mw= 1.36 × 104 and Mw/Mn= 1.19) have been studied. Single crystals extracted from the melt show two types of curved lateral habit: a lenticular shape elongated in the direction of the b-axis and a truncated lozenge…
The strontium titanates SrTiO3, Sr2TiO4, Sr3Ti2O7 and Sr4Ti3O10 can be synthesized by a sol–gel method at low temperatures. The reaction between strontium acetate solution and titanium(IV) isopropoxide leads to the formation of strontium titanate gels. The gels can be converted to the strontium titanates by drying and…
The adsorption and decomposition of acetic acid has been studied on Pd(110) using temperature-programmed desorption (TPD). On the clean surface, the acid dissociates to form a stable acetate, and hydrogen is desorbed at 300 K. Some of the acetate then decomposes at around 353 K to yield CO2 and H2 into the gas phase a…
Coplanar MMIC stub configurations are investigated by means of the finite-difference method in the frequency domain. The open end, the short end, and a capacitively loaded short end (MIM-short) are analyzed. Their parasitic effects are described in terms of the effective length extension l/sub ext/. The influence of t…
The effect of mechanical treatment in a planetary ball mill on the transformations of polymorphs of sulfathiazole were studied by means of X-ray diffraction analysis, infrared spectroscopy and differential scanning calorimetry. It has been shown that mechanical treatment initiates transitions of sulfathiazole polymorp…
The feasibility of rapid thermal curing (RTC) of benzocyclobutene (BCB) thin films using an infrared belt furnace is demonstrated. The effects on film properties resulting from a dramatic reduction in cure time (5 h to 5 min) are summarized. The extent of cure was determined by Fourier-transform infrared (FTIR) method…
Shape memory alloys (SMAs) have several unique characteristics, including their Young’s modulus-temperature relations, shape memory effects, and damping characteristics. The Young’s modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore,…
Characteristics of the sintered compacts and the microstructures and electrical properties of Nb‐doped TiO 2 varistors with added Ba and Bi were studied at various sintering temperatures ranging from 1250° to 1400°C. Adding both Ba and Bi to Nb‐doped TiO 2 ceramics resulted in a maximum intergranular phase and a minim…
The significance of memory propagation in controlling the stochastic behavior of partial-discharge phenomena is demonstrated by determination of various conditional amplitude and phase-of-occurrence distributions for both measured and simulated discharge pulses. A system that can be used to measure directly a set of b…