Crystal structure of cesium ortho-tellurosilicate, Cs4SiTe4
Cs 4 SiTe 4 , cubic, P43n (No. 218), a = 15.081(2) , V = 3430.0 3 , = 8, Rgi(F) = 0.032, wR,ef<F 2 ) = 0.057, =293 .
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Polyethylene-g-Maleic Anhydride, a Compatibility Booster in Low Density Polyethylene and Polyvinylacetate Blend Preparations
Low density polyethylene (LDPE) and polyvinyl acetate (PVAc) blends containing different weights percentages of PVAc, were prepared. Polyethylene graft Maleic anhydride (PE-g-MA) containing 0.4 mole% of anhydride groups was used as compatibility booster in the blends. FTIR helped confirming the blend formation. Improv…
Optically Functional Zeolites: Evaluation of UV and VUV Stimulated Photoluminescence Properties of Ce3+- and Tb3+-doped Zeolite X
The optical properties of Tb3+/Ce3+ doped zeolites are elucidated with emphasis on ultraviolet (UV) and vacuum ultraviolet (VUV) excitation and luminescence. Ce3+ sensitized Tb3+ emission with quantum yields of 85 % may be obtained at 330 nm excitation. Low absorptivity at 254 nm due to low Ce3+ concentrations or low…
Chiral Interactions and Structures
The chiral structure of liquid crystalline phases arises due to the intrinsic chirality of the constituent mesogens. While it is seemingly straightforward to quantify the macroscopic chirality by using, for instance, the cholesteric pitch or the optical rotatory power, it is not as simple to quantify the chirality of…
Spherulitic Morphology of Isotactic Polypropylene and its Melting Behavior
The crystallization and lamellar morphology of isotactic polypropylene (ipp) have been investigated by thermal analysis and electron microscopy. When ipp samples are crystallized above 132°C, no β-phase was detected and the samples consisted of pure α-spherulites and those showing double melting endotherms, the occurr…
Studies on the Modification of Thermoplastic Polyolefins (TPOs). II. Effect of Processing Conditions on the Morphology and Adhesion of Two Components (2K) Polyurethane Coatings to the Modified TPOs
The morphology of thermoplastic polyolefins (TPOs) has a profound effect on their paintability. Paint molecules can penetrate an amorphous surface easier than a crystalline one. The effects of the compression molding processing conditions, such as molding temperature and cooling rate, on the crystallinity of TPOs were…
Light Scattering Studies in Cellulose Derivative Based PDLC Type Cells
In this work we have analysed the light scattering pattern produced by the cellulose derivative based PDLC type cells [1-5] when illuminated at normal incidence by a laser light beam. The voltage dependence of the scattering pattern was obtained along with the voltage dependence of the cells' transmission coefficient.…
Characterization of Mn-doped Sb1.5Bi0.5Te3single crystals
Single crystals of (Sb0.75Bi0.25)2-xMnxTe3 (x = 0.0–0.05) were characterized by X-ray diffraction, measurements of reflectance in the plasma resonance frequency region, Hall coefficient, electrical conductivity, and Seebeck coefficient. It was found that Mn atoms in the crystal structure of Sb1.5Bi0.5Te3 behave like a…
Mechanism of the formation of a soft mode in ferroelastic phase transition
It is shown that the softening of the acoustic mode and the ensuing ferroelastic phase transition are due to the linear-quadratic interaction between the symmetric and antisymmetric deformations, which is presently neglected in the literature. An expression is obtained which can be used to predict the phase transition…
Strongly Acidic and High-Temperature Hydrothermally Stable Mesoporous Aluminosilicates with Ordered Hexagonal Structure
Self-assembly of preformed aluminosilicate nanoclusters in the presence of templating micella provides a route to strongly acidic, hydrothermally stable mesoporous aluminosilicates with ordered hexagonal structures (MAS-5). Results show that the materials are similar to Beta zeolite and are highly active for the catal…
Structural changes during thermal dehydration of ettringite
Changes in crystal structure of ettringite on dehydration in normal atmosphere have been re-examined by means of thermogravimetry, X-ray diffraction, and 27Al nuclear magnetic resonance spectroscopy. Synthetic ettringite crystals were heated at various temperatures up to 200°C for durations of up to 7 h. The ettringit…
Crystallization of a eutectic Pb-Sn melt in the thermal field of a temperature gradient
The crystallization of a eutectic Pb-Sn melt is investigated under nonuniform conditions in vacuum, in air, and in water. It is found that the structure of the solid-state systems formed depends on the cooling conditions. A structural inhomogeneity in volume and a correlation between the microstructure and the coordin…
Nitrogen Absorption and Desorption Characteristics for CeFe7
Abstract Reversible nitrogen absorption and desorption cycle of CeFe7 and Ce2Fe17 was performed by heating in NH3 or N2 for nitrogenation and in H2 for denitrogenation. The nitrogen absorption and desorption rates for CeFe7 were faster than that for Ce2Fe17 owing to the high diffusion rate of nitrogen for CeFe7, resul…
The Comparison Effects of Palm Oil Fatty Acid and Stearic Acid in Various Natural Rubber Compounds
The effect of palm oil fatty acid (POFA) and stearic acid on dynamic properties, curing characteristics and mechanical properties of natural rubber (SMR L) and epoxidized natural rubber (ENR 50) was investigated in the concentration range of 1 to 7 phr. Results indicate that scorch time, t 2 , cure time, t 90 and maxi…
Properties of a New Kind of Structure: Lattice of Spiral Domains
The properties of a new domain structure, the equilibrium hexagonal lattice of spiral domains in ferrimagnetic films with perpendicular anisotropy were experimentally studied. The intervals of the bias fields and temperatures under which the lattice can be formed are determined. Temperature and field intervals of spir…
Study of Isotope Effects in the Hydrogen Transport of an 8% CrWVTa Martensitic Steel
A time-dependent gas-phase isovolumetric desorption technique has been used to assess the isotope effects in the diffusive transport parameters of hydrogen in an 8% CrWVTa reduced activation martensitic steel in the temperature range of 423–892 K and driving pressures from 4 × 104–105 Pa. The experiments have been run…
NEW OCCURRENCES OF ANDUOITE, (Ru,Os)As2, FROM CHROMITE DEPOSITS OF UKRAINE AND ALBANIA
Two new occurrences of anduoite, (Ru,Os)As2, a rare platinum-group mineral (PGM), are reported from chromitites, one from the Kapitanov deposit, Ukrainian Shield, Ukraine, and the other from the Maja e Sukes deposit, Tropoja ophiolitic massif, Albania. At Kapitanov, anduoite occurs as discrete, homogeneous, euhedral c…
Gelation of rigid PVC during processing
Streszcz. ang.
SHRINKAGE BEHAVIOR OF ORIENTEDPOLY(ETHYLENE TEREPHTHALATE)
The kinetics of thermal shrinkage of poly(ethylene terephthalate) films have been characterized and related to various parameters of the stretching process. Amorphous orientation functions and levels of crystallinity have been found to be of major importance to the shrinkage process. As film extension ratios increase,…
Low-temperature magnetothermodynamics of Pr0.7Ca0.3MnO3
We present a detailed magnetothermal study of Pr0.7Ca0.3MnO3, a perovskite manganite in which an insulator-metal transition can be driven by magnetic field but also by pressure, visible light, X-rays or high currents. We find that the field-induced transition is associated with a large release of energy which accounts…