Materials Literature
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A couple of Rietveld-analysis programs, RIETAN, for angle-dispersive diffraction and time-of-flight neutron diffraction have been extensively used for structural studies of many compounds. The history of their developments is briefly reviewed. The latest versions, RIETAN-2000 for angle-dispersive diffraction and RIETA…
A number of recent papers have dealt with such properties of clay minerals as their compositions, assemblages, contents and crystallinities,which can reflect the periodic climate changes of the mineral sources and help to reconstruct paleoclimate. Due to the sensitivity of the clay minerals, however, any climatic infl…
Accurate non-isothermal finite-element simulation of the forming of woven impregnated composites requires a precise knowledge of material behaviour. Consequently, a constitutive model to predict the shear force of impregnated woven composites has been developed. The main objective of the model is to predict shear forc…
The hysteresis phenomenon inherent to redox processes of Electronic Conducting Polymers (ECP) has been studied. Hysteresis was divided into two classes: i) dynamic hysteresis, containing a kinetic and an ohmic component and ii) stationary or thermodynamic hysteresis. A mathematical analysis was performed on the dynami…
The micro- or nano-structured mold used for polymer embossing typically must be coated with an anti-adhesion material to reduce its interaction with the embossing. The mold is typically made by nickel sulphamate electroforming. For the anti-adhesion coating to adhere to the mold, the nickel mold surface must be clean…
The effects of hydrogen on the electronic structure of the passive film on iron were investigated by photoelectrochemical methods. It was found that hydrogen increases the magnitude of the photocurrents from the passive films formed at all investigated potentials, and decreases the bandgap energies of the passive film…
We have measured the silicon tracer diffusivity (30Si) in single crystalline 2/1-mullite parallel to the crystallographic b- and c-axes, respectively. No significant difference between the b- and c-directions was found within the experimental error of 30%. An activation enthalpy of 612 kJ mol−1 and a pre-exponential f…
This review article is concerned with two new convenient synthetic routes for a photosensitive poly(benzoxazole) (PBO). The first synthetic route is based on poly(o-hydroxyamide) and 1-{1, 1-bis[4-(2-diazo-1-(2H)naphthalenone-5-sulfonyloxy)phenyl]ethyl}-4-{1-[4-(2-diazo-1(2H)naphthalenone-5-sulfonyloxy)-phenyl]-methyl…
This review is a brief account of R& D results generated from drying behavior of carpets. First of all, the mathematical rela?tions are reviewed and then, they are developed in detail, which may be used to describe the moisture sorption mechanisms of car?pet. The effect of important parameters during the drying pr…
Radical cations of Group 14 element organometallics R4E and R3EER3 (E = Si,Ge,Sn, R = Me,Et) were generated in alkane solutions by X-ray irradiation and studied using the time-resolved magnetic field effect technique. Modeling shows that in alkane solutions the g-factors of Me4E+˙ and Me3EEMe3+˙ are close to those mea…
Failure and stiffness properties of a woven 8 harness satin (8HS) graphite/PMR-15 composite have been investigated at room temperature and at 315°C by performing the ±45° tensile and Iosipescu tests. Acoustic emission has been monitored during testing. The critical loads for the initiation of damage in the composite h…
Our work of new ferroelecric survey was reviewed. A 2 BX 4 -type compounds having Sr 2 GeS 4 structure, where A = K, Rb, Tl and Cs, B = Zn, Co, Cd and Hg, X = I and Br, were synthesized by the Bridgman method. Their dielectric and phase transitional properties were investigated. From the results, several empirical rel…
Abstract The new compound [{(C 2 H 5 ) 2 NH 2 } 2 In 2 Ge 2 S 8 ] · [(C 2 H 5 ) 2 NH] 0.25 was synthesized under solvothermal conditions using elemental In, Ge, and S in diethylamine. The title compound crystallizes in the orthorhombic space group Pna2 1 with a = 12.804(3)Å , b = 17.615(4)Å, c = 13.067(3)Å, V = 2947.2…
Investigation of porous silicon carbide layer morphology and its growth rate was studied along with electrical characterization. Morphology of the formed porous SiC layers was analyzed by scanning electron microscopy. The effective carrier density in porous layers was extracted from the capacitance-voltage characteris…
Foreign object damage (FOD) behavior of two commercial gas-turbine grade silicon nitrides, AS800 and SN282, was determined at ambient temperature through post-impact strength testing for thin disks impacted by steel-ball projectiles with a diameter of 1.59 mm in a velocity range from 115 to 440 m/s. AS800 silicon nitr…
The synthesis of host–guest composites consisting of entrapped poly(acrylic acid) (PAA) and inorganic host MCM-41 is described. The monomer acrylic acid (AA) and initiator azoisobutyronitrile (AIBN) were introduced into the channels of MCM-41 using supercritical CO2 as a solvent at 35.0 °C, followed by free radical po…
A method using the atom-vacancy ordering phenomenon for the visualization of structural vacancies in crystals was suggested and implemented. The ordered nonstoichiometric titanium monoxide Ti 5 O 5 was taken as the object of investigation, because the structural vacancies in this compound can be observed due to the fo…
The use of the glass slag method in the extraction of Sm from Sm–Co alloys was studied. The magnetic SmCo5 phase decomposed into Sm oxide phase and Co phases by the glass slag method. The Sm oxide phase was extracted by the surrounding molten glass slag materials in the glass slag method. The resultant alloys consiste…
We present three-dimensional simulations of field emission through an oscillating barrier from an ideal open (10,0) carbon nanotube without adsorption by using a transfer-matrix methodology. By introducing pseudopotentials for the representations of carbon atoms and by repeating periodically a basic unit of the nanotu…
Abstract X‐ray absorption fine structure (XAFS) analysis and transmission electron microscopy (TEM) have been used for investigating the atomic structure and microstructure of rust formed on a weathering steel and a relevant iron–chromium alloy. The XAFS results have shown that the atomic structure of the rust is an F…