Materials Literature
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Structural parameters for the ferrimagnetic and paramagnetic phases of magnetite have been refined from neutron multiple diffraction data. Experimental neutron multiple diffraction patterns were obtained by measuring the 111 primary reflection of a natural single crystal of this compound. Measurements were made at roo…
Various water-soluble polymers, with special emphasis on polyacids, were employed for the stabilization of colloidal platinum nanoparticles which had been prepared by the in-situ reduction of dihydrogen hexachloroplatinate H2PtCl6. The particle sizes, size distributions, and morphologies of the platinum nanoparticles…
The structure of porous silicon carbide has been studied using transmission electron microscopy both in planar geometry and in a cross-section of a porous film. Peculiar structures in the form of shared rosettes with petals of about 3-8 m in size and a density of were found in the subsurface layer. These formations ar…
Abstract Hydroxyaluminosilicate (HAS) and hydroxyaluminum (HyA) ionic solutions having final Al concentrations ranging from 3.74 to 4.00 m M ; NaOH/Al molar ratios of 1.0, 2.0 and 2.5; and Si/Al molar ratios of 0.00, 0.27–0.30, 0.51–0.56 and 0.95–1.01 were prepared through the interaction of AlCl 3 , or-thosilicic aci…
This paper presents a summary of an on-going multi-client programme undertaken by D&K Consulting SA covering "Breathable and Water proof Fabrics." The reports for Western Europe and the U.S. markets have already been published and the analysis of selected Asian countries is planned for this year. The whole program…
In this paper, the effect of silicone softener application on low-stress mechanical and surface properties of textile materials is investigated using the Kawabata evaluation system for fabrics. Regression equations are derived to describe the influence of the treatment conditions—temperature, curing time, and softener…
Growth histories of contact twins of natural diamond have been elucidated by nondestructive techniques of X-ray topography, using both conventional and synchrotron sources. Reflection conditions for the simultaneous imaging of both members of a diamond, twinned on (111), are given. The common `triangular' contact twin…
A procedure to determine dialysate pressure isobars by comparing the results of magnetic resonance imaging (MRI) and numerical simulation of the dialysate flow was established. The assumption used in the filtration analyses, that the dialysate pressure varies only in the central-axial direction, is supported by the fi…
Frozen crystals of proteins, nucleic acids or other biological macromolecules often have mosaic spreads comparable to the maximum useful oscillation angles. It is, therefore, necessary to develop scaling methods that are independent of the exclusive use of full reflections. The Hamilton, Rollett and Sparks [ Acta Crys…
Ceramic samples of Sr1-xCdxTiO3 and (1-x)SrTiO3–(x)KNbO3 solid solutions were investigated using a dielectric technique in the temperature range from 4.2 K to 300 K at frequencies of 1 kHz and 1 MHz. Phase diagrams of these systems are derived. It is shown that there are ferroelectric phase transitions in Sr1-x Cd x T…
The disorder at room temperature in crystalline Cs 2 HgCl 4 , dicaesium mercury tetrachloride, is studied by the Maximum Entropy Method (MEM). X-ray scattering up to θ = 30° (Mo K α radiation) revealed the orthorhombic space group Pnma , with a = 9.8136 (9), b = 7.6018 (6) and c = 13.4201 (9) Å. Refinement converged t…
Abstract The sorption capacity of hydrotalcite (HT) and its calcined product (CHT) was evaluated for 131 I − sorption from water solution and it was determined as a function of the calcining temperature. The radionuclide content was determined by γ-spectrometry. Solids were characterized by thermal analysis, X-ray dif…
Optical absorption spectra of TlInS2 single crystals were investigated in the temperature range of 10–340 K. The exponentially increasing absorption tails were explained as Urbach tails. TlInS2 single crystals exhibited five different convergent groups of lines ln α(E,T) having different convergence points of E0 and α…
We report progress in the development of a monolithic, self‐powered photovoltaic‐electrochromic coating for energy‐conserving windows. The coating employs an all solid‐state electrochromic device based on Li‐doped as an optical transmittance modulator and a wide‐bandgap amorphous SiC alloy (a‐SiC:H) photovoltaic (PV)…
The melting transition of a system of hard cubes is studied numerically both in the case of freely rotating cubes and when there is a fixed orientation of the particles: parallel cubes. It is shown that freely rotating cubes melt through a first-order transition, whereas parallel cubes have a continuous transition in…
Abstract Binuclear iron(III) spin-crossover complex [Fe2(salten)2(az)](BPh4)2 (az = azobis(4-pyridine)) was synthesized and characterized by X-ray single-crystal diffraction, Mössbauer spectra, magnetic susceptibilities and electronic spectra. This complex contains the ligand which is able to photoisomerize as a bridg…
We report measurements of Raman spectra and infrared-absorption spectra of hexagonal ${\mathrm{BaMnO}}_{3}$ in its polycrystalline form. The results are discussed in the framework of a group-theoretical analysis of the allowed zero-wave-vector phonons in this compound. The temperature dependence of the frequency and l…
Block copolymers of unsubstituted poly(p-xylylene)(PPX) and Ge- or Sn-organic bridged PPX (GePPX and SnPPX) were prepared by pyrolysis of specially synthesized organometallic p-cyclophane precursors followed by deposition and polymerization of the thus produced p-xylylene monomers. The copolymer structure and thermal…
X-ray diffraction based on the comparison of experimental and calculated powder profiles enabled the determination of the structural characteristics of hydrated and dehydrated Tunisian nacrite. Using the concept describing the structure of natural nacrite, the stacking mode of the layers in the hydrated and dehydrated…
Organophosphazenes with a similar mesogenic moiety were prepared and their mesogenicity was studied by differential scanning calorinetry (DSC) measurements and polarizing microsope observations. In cyclotriphosphazenes with alk-oxybiphenyl and Schiff base moieties, mesomorphic phase transitions were observed, but no…