Materials Literature
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Single crystals of natural diamond which exhibit an approximately cubic morphology are known to have grown either ( a ) by nonfaceted cuboid growth or ( b ) by fibrous growth branching in a multiplicity of 〈111〉 columns, to give a mean surface orientation of {100}. Interpenetrant twins of diamond are uncommon; but whe…
The basic structural differences between three thermotropic liquid crystals TB4A, TB7A and TB10A have been interpreted by analysing their Raman spectra. Three spectral regions, 925-1025, 1275-1475 and 1525-1650 cm-1, have been chosen in this context to incorporate their structural dissimilarity. The induced planarity…
Abstract Okayamalite, Ca 2 B 2 SiO 7 , tetragonal, P 21 m , a = 7.116, c = 4.815 Å, Z = 2, is a new member of melilite group, the boron analogue of gehlenite. Electron microprobe analysis gave CaO 46.28, B 2 O 3 28.50, SiO 2 24.24, Al 2 O 3 0.36, total 99.38 wt.%, corresponding to Ca 2.01 B 2.00 Si 0.98 Al 0.02 O 7 ,…
Bei der Oxidation der Lanthanide Gadolinium, Terbium, Dysprosium und Holmium mit Selen im molaren Verhältnis 2 : 3 in evakuierten Quarzglasampullen (700 °C, 7 d) bilden sich unter Zugabe von CsCl ternäre Caesium–Lanthanid-Selenide der Zusammensetzung Cs3M7Se12 (M = Gd–Ho). Ein großer Überschuß an CsCl fördert als Fluß…
A series of new bis-benzocyclobutene-endcapped arylene ether monomers was prepared and characterized. Whereas 2,6-bis(4-benzocyclobutenyloxy)benzonitrile (BCB-EBN) could be prepared in good yield using the standard procedure (K2CO3/NMP/toluene/Dean–Stark trap/120°C), other bis(benzocyclobutene) (BCB)-terminated monome…
The synthesis of Li 6 CoO 4, Na 4 CoO 3, and Na 10 Co 4 O 9 and the refinements of the crystal structures of the two sodium compounds are reported. The physical properties of these materials have been studied by measuring the absorption spectra and the susceptibility. An interpretation of these data is presented for t…
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)…