Materials Literature
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Semiconducting compounds based on silicides of 3d transition metals (MnSi 1.75 and CoSi) are promising thermoelectric materials for mass-produced thermoelectric generators. Their practical use has been delayed so far by the lack of reliable switching. Electrochemical surface treatment technology and metal deposition w…
Abstract. Viscosity of shock-compressed A1 and Pb was determined at pressures 31-202 C-Pa and 35-250 GPa by experimental investigation of the development of small perturbations in the shock wave front. Results of experiment shown that viscosities Al and Pb at pressure 31 GPa and 35 GPa are practically equal and amount…
The thermal degradation behavior of single‐layer BN and of double‐layer BN/SiC chemically vapor‐deposited fiber coatings in mullite‐fiber‐reinforced mullite composites was investigated by means of transmission electron microscopy after processing and heat treatment of the composites at 1000°, 1200°, and 1300°C for 6 h…
Melt-crystallization kinetics of long monodisperse n -alkanes with chain lengths in the region between 194 and 294 C atoms was investigated by differential scanning calorimetry (DSC) and real-time small-angle X-ray diffraction. Isothermal crystallization experiments on C 294 H 590 and cooling experiments on C 194 H 39…
Fatigue failure in near α-titanium alloys is associated with the formation of quasi-cleavage facets. These facets can span several α colonies and can share a common basal plane. The research focuses on the frequency of occurrence of such basal-plane-sharing colonies, comparing the ratio of the number of colonies with…
The interlayer magnetoresistance of the organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 )Br is measured at ambient pressure and under pressures of up to 12.5 kbar. In addition to the slow Shubnikov-de Haas oscillations with a frequency of ≃150 T observed at P ⩾5 kbar, rapid oscillations attributed to the magnetic bre…
Al 5.103 (Fe, Cr), orthorhombic, Imm 2, a = 12.34, b = 12.41, c = 30.71 Å, V = 4701 Å 3 , atoms/cell = 305 (average), D x \simeq 3.4 g cm −3 . A structural model of the non-Fibonacci approximant O-AIFeCr with composition Al 5.103 (Fe, Cr) found in an Al 12 Fe 2 Cr alloy has been derived from its high-resolution electr…
Abstract Pyroaurite-like carbonate hydroxide precursors Co1−xFex(CO3)x/2(OH)2·nH2O, where x varies in the range 0.25 ≤ x ≤ 0.75, yield cation deficient mixed oxides with particle dimensions in the nano-scale range. The thermal decomposition and spinel structure formation processes have been studied by thermal analysis…
A mechanism-derived lumping strategy for modeling the acid-cracking kinetics of hydrocarbon mixtures based on a limited set of pure component experimental data was tested in terms of its ability to predict the kinetics and product spectra from the reaction of a 1-phenyloctane/ n -hexadecane mixture. The modeling appro…
Results are presented of an EPR study of theO − hole center in LiB 3 O 5 (lithium triborate) crystals. Analysis of angular dependences of EPR spectra is used to determine the principal values of the g tensor ( g XX =2.032, g YY =2.020, g ZZ =2.007), along with the modulus of the isotropic part of the A 2 tensor (| A |…
When heat treated, amorphous alumino-silicate fibres will devitrify into crystalline phases which on cooling become stable at room temperature. X-ray diffraction has been used to identify and quantify the phases present in such products; mullite and two distinct forms of cristobalite have been observed. One form of cr…
The synthesis and nitrogen oxide (NO) removal activities of composite powders in the copper‐lanthanum‐alumina(Cu‐La‐Al 2 O 3 )system were studied, in regard to their high‐temperature application as an automotive lean‐burn exhaust catalyst. The solid‐state reaction between the copper, the lanthanum, and the Al 2 O 3 su…
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The total elimination of air represents a serious hurdle in modified atmosphere packaging of bakery products, due both to the high spin-rates of the packaging lines and, particularly, to the typical texture of bakery products which retain large quantities of air inside their porous structure. Simulating the gas-flushi…
A technique of measuring basic Landau-expansion coefficients in ferroelectric liquidcrystals is proposed. The method is based on combined measurements of the tilt angle andthe total polarization of ferroelectric liquid crystals at various temperatures and electric field strength in the vicinity of the ferroelectric S*…
Abstract The molecular dynamics of dendrimer branches were studied by observing the excimer formation of pyrenyl end‐groups. By a selective synthesis only one pyrene moiety per dendron was attached, resulting in a dendrimer with 3 fluorophors per molecule. The first 3 generations of the dendrimer were synthesized by t…
Swelling measurements in six organic solvents were carried out on samples of dicumyl peroxide crosslinked ethylene–propylene–diene (EPDM) having various crosslink densities. The Flory–Huggins interaction parameter χ was determined for EPDM vulcanizates 312 and 812 as well as their mixture 312/812 using the Flory–Rehne…
Thermally-stimulated depolarization measurements on single-crystal specimens of KOH-doped ice have shown that the crystal structure of ice XI has ferroelectric ordering parallel to its c -axis. The charge-release peak identified with the detransformation of ice XI to ice Ih is produced at the 72 K transition temperatu…
The internal structure and orientation behavior of two series of spandex fibers, which were made with different spinning methods and different soft and hard segment types, were studied by FTIR (Fourier Transform Infrared Spectroscopy), polarizing light microscopy, and Instron. The orientation behavior of hard and soft…
The results of total energy, band structure, density of states and charge density calculations for lithium azide using an ab-initio technique of pseudo-atomic orbitals are presented. The computations are performed based on the density functional theory within a local density approximation applying the basis of sp3d5 p…