Materials Literature
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Dielectric properties of oxygen deficient BaBiO3−δ have been analyzed, and dielectric loss anomalies at 175 and 225 K were found, which were dependent on oxygen deficiency. The activation energies corresponding to the relaxation processes of dielectric anomalies at 175 and 225 K were 0.26 and 0.50 eV, respectively. Th…
Abstract The cetineite structure-type has the very general formula A 6 [ B 12 O 18 ][ CX 3 ] 2 [ D x Y 6− y ] with 0 ≤ x ≤ 2 and 0 ≤ y ≤ 6. In a preceding paper [Eur. J. Solid State Inorg. Chem. 35 (1998) 27–37] natural and synthetic cetineite-type phases with A = Na + , K + , Rb + , Sr 2+ , Ba 2+ ; B = C = Sb; X = S…
Abstract Modifications of structure and morphology of the polymers induced by the thermomechanical stress (or by the presence of water for some polymers) during reprocessing can cause a drastic deterioration of mechanical properties of the recycled material. The property ‐ reprocessing relationships are an important t…
The results of application of gradient theory of elasticity to a description of elastic fields and dislocation and disclination energies are considered. The main achievement made in this approach is the removal of the classical singularities at defect lines and the possibility of describing short-range interactions be…
Abstract The effects of filler size on the properties of a thermoplastic polyolefin (TPO) blend were examined by using wollastonite and talc with particle sizes ranging from 1.2 to 40 μm. While addition of filler produced significant changes in the mechanical properties of the blend, filler size affected only impact s…
Thin layers of epitaxial CdSe nanocrystals with rocksalt structure have been electrodeposited onto gold alloy films. The rocksalt phase does not normally exist for CdSe at ambient pressure, and its (meta)-stability is attributed to the strong interaction between CdSe and Cd–Au (since the phase is virtually absent for…
The narrow band-gap semiconductor ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}\mathrm{Te}$ has a low-temperature ferroelectric rhombohedral phase whose average structure is a distorted rocksalt structure. We have measured the extended x-ray-absorption-fine-structure (EXAFS) spectra of ${\mathrm{Pb}}_{1\ensuremat…
The structure of a CaO–SiO 2 –ZrO 2 -based glass ceramic has been investigated by X-ray diffraction, X-ray absorption spectroscopy and differential anomalous scattering techniques as a function of the thermal treatment of the sample. The microstructure of the glass has been investigated at room temperature, before the…
The effect of fast neutron irradiation on the mechanical properties of magnesium aluminate spinel single crystals and polycrystals, such as bending strength, fracture toughness, Young's modulus, and hardness, was summarized based on the reported data. Essentially, the changes in these properties are dependent on the n…
Because the conventional formula for turbulent orifice flow rate has an infinite derivative when the pressure difference is zero, ODE solvers may fail during numerical simulation of fluid power circuits. To remedy this, a two-regime orifice flow formula is proposed in which an empirical polynomial laminar flow functio…
Abstract The effects of a controlled heat‐setting treatment on the properties and microstructure of biaxially stretched poly(ethylene terephthalate) (PET) and poly(ethylene‐2,6‐naphthalene dicarboxylate) (PEN) films are described. Substantial changes in crystalline fraction, crystallite size, glass transition temperat…
Reaction of EuCl(3).6H(2)O with 3-phenyl-4-hydroxycyclobut-3-ene-1,2-dione (phenylsquarate) in methanol produces the polymeric complex {Eu(&mgr;-C(6)H(5)C(4)O(3))(2)(C(6)H(5)C(4)O(3))(2)(CH(3)OH)(2)(H(2)O)(2).(CH(3)OH)}(n)() (1) which crystallizes in the space group P2(1)/n with a = 13.4049(5) Å, b = 13.7043(7) Å, c =…
The (pyridylazo)oxime ligand (C(5)H(4)N)N=NC(=NOH)C(6)H(4)R(p), HRL (R = H, Me), has been synthesized with the objective of promoting the very rare mononuclear oximato-O coordination. The synthesis involves hydrazone nitrosation. HRL reacts with M(ClO(4))(2).6H(2)O, affording [M(RL)(2)] (M = Mn, Fe), and X-ray structu…
A simple micromechanical model is developed to predict the onset of tear propagation at slit-like damage sites (i.e., a series of consecutive aligned yarn breaks) in biaxially stressed plain weave fabrics under increasing loading. A crucial aspect of the model is the treatment of the frictional slip of yarns near the…
The first order intracellular degradation of various polyhydroxyalkanoic acid (PHA) inclusions in Hydrogenophaga pseudoflava cells was investigated by analyzing the compositional and microstructural changes of the PHA using gas chromatography, (13)C NMR spectroscopy, and differential scanning calorimetry. Two types of…
We present the results of high pressure studies of magnetization, magnetic phase transitions, and related volume anomalies for the intermetallic compound Ce2Fe17 under hydrostatic pressures up to 10 kbar. The giant negative pressure effect on the ferromagnetic ordering temperature ΘT=94 K was determined: dΘT/dP=−(38±2…
The purposes of this work were to determine: whether thickness of single layers can be used to accurately predict thickness and thermal resistance of multiple layer assemblies; and to identify variables affecting the total thickness (i.e. textile plus air layers) of bedding during simulated use. Thickness was determin…
A mixture of and was prepared from metal alkoxides and fired at 1650°C to form mullite and an glass phase. After leaching out the glass phase, crystalline mullite powder was obtained. Transmission electron microscopy examination revealed the powder to be cylindrical particles of single‐crystal mullite. A diffusion exp…
Five heats of Type 308 austenitic stainless steel were custom designed and melted with equal combined phosphorus and sulfur (P+S) levels of 0.032 wt-%, representing very low S and high P, very low P and high S, and equal amounts of each at both median and very low levels. The effect of individual P and S levels on wel…
Compounded polypropylene powders with various concentrations of corn starch were processed in a Haake torque rheometer at constant temperature, 180 °C, for different times in a closed system. A scanning electron micrograph of 5-min processed sample shows a fine dispersion of starch particles in the polypropylene (PP)…