Materials Literature
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Dielectric properties of the AgNbO3 (AN) and Ag1−xLixNbO3 ceramics with x = 0.02, 0.04, 0.06 were investigated at microwaves (MW, 36 GHz) in the temperature range of 100 ÷ 570 K. including the phase transitions in AN at 340K (weak ferroelectric - antiferroelectric) and at 530K (antiferroelectric-antiferroelectric). Th…
Abstract 1H NMR spin-lattice relaxation times T1 and T1ρ as well as the electrical conductivity were measured as a function of temperature in (n-C5H11NH3)2ZnCl4 and (n-C12H25NH3)2ZnCl4. The highest-temperature solid phase in both compounds was found to be the rotator phase, where rod-like cations perform uniaxial reor…
With the advances made in the past decade, catalytic incineration of volatile organic compounds (VOCs) has become the technology of choice in a wide range of pollution abatement strategies. In this study, a test was undertaken for the catalytic incineration, over a chromium oxide (Cr2O3) catalyst, of n-hexane, benzene…
Galvanic action between zinc and steel is an important property that contributes to the high corrosion resistance of zinc-coated steels. Quantitative knowledge of the galvanic throwing power (i.e., the area of the steel surface that is not covered with zinc but is galvanically protected by the coating in the surroundi…
Measurements are reported for the d.c. Kerr response and the pretransitional behaviour of a new liquid crystal, 4-cyanophenyl 4-pentylbenzoate at and above the nematic-isotropic phase transition temperature. The real parts of the third order nonlinear susceptibilities chi(3) at and above the nematic-isotropic transiti…
In addition to the known sterols and ketosteroids beta-sitosterol (24 alpha-ethylcholest-5-en-3 beta-ol), stigmasterol (24 alpha-ethylcholesta-5,22-dien-3 beta-ol), campesterol (24 alpha-methylcholest-5-en-3 beta-ol), beta-sitostenone (stigmast-4-en-3-one, 24 alpha-ethylcholest-4-en-3-one), stigmastenone (stigmasta-4,…
Abstract Reversibility in the formation reaction of a series of the oxo(peroxo)porphyrinatomolybdenums, [MoVIO(tmp)(O2)] 1, [MoVIO(tdcpp)(O2)] 2, [MoVIO(ttp)(O2)] 3, [MoVIO(tdmpp)(O2)] 4, and [MoVIO(tpp)(O2)] 5, was studied. In these dioxygen complexes with various porphyrin rings, two complexes, 2 and 4, were newly p…
Systematic studies on the sorption and diffusion behaviors of gases in low-molar-mass liquid crystalline substances (LCs) have been performed. The experiments were carried out in different gas atmospheres over temperature ranges which covered the phase transitions of the LCs under investigation, and at pressures of up…
A stable one-dimensional quasicrystal has been found for Al-Co-Ni which is related closely to the decagonal phase in this system. It exists as a high-temperature state above 900 C in a range of compositions between approximately 71 and 71.5at.% Al between 18at.% and 22at.% Co. The modulation length along the periodic…
Thin films of Cu 2 O were electrodeposited and characterised by techniques including XRD, SEM–EPMA, and spectrophotometry. The structure, morphology, composition, and optical properties of the films depend on the electrochemical bath and deposition parameters. The kind of substrate pretreatment process also seems to h…
Magnetic properties of Cd1−yMnyS nanocrystals have been studied. They vary with the particle size and markedly differ from those observed in the bulk phase, in particular their interactions drastically increase compared to those observed in the latter case. A Mn2+–Mn2+ interaction enhancement with decreasing size invo…
Crystalline ${\mathrm{Cs}}_{3}{\mathrm{Bi}}_{2}{\mathrm{I}}_{9},$ with the ${P6}_{3}/mmc$ symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At ${T}_{0}=220 \mathrm{K}$ the crystal undergoes a second-order proper ferroelastic phase transition to…
The synthesis and applications of carbon nanotubes, a new form of crystalline carbon, are reviewed. In particular, the results obtained in the authors' laboratory are summarized, including the preparation of highly crystalline multi-walled carbon nanotubes; also discussed are the valence band and core level structures…
The morphology, thickness, oxidation and illumination effects in dodecylsulphate doped polypyrrole films can be qualitatively observed by EIS and consist in variations of interfacial and bulk resistances and capacitances of a proposed equivalent circuit. The circuit well with the measured spectra of films obtained wit…
The role of alloying elements and the effect of prior cold work on microstructural evolution in Supral type alloys during high temperature straining has been investigated by examining a range of binary and ternary alloys containing varying amounts of Cu and/or Zr. After hot compression, specimens were rapidly cooled t…
Silver black was deposited on SiO 2 /Si substrates by thermal evaporation under various gas atmospheres (Ar and N 2 ). The dependence of surface morphology evolution of silver-black coating on deposition parameters was studied. The metal-black layers obtained by evaporation are reproducible. With an increase of deposi…
Abstract We have prepared a novel water-soluble silver(I) complex showing effective antibacterial activities K12[Ag8(mba)10]·12H2O (1a, H2mba = 2-mercaptobenzoic acid) from the Ag2O : H2mba : KOH = 1 : 4 : 8 molar ratio reaction in aqueous media and determined its crystal structure. The X-ray crystallography revealed…
Carbon-chain heterofunctional oligoperoxides (HFOs) with ditertiary peroxidic, carboxy, or hydroxy groups formed stable coordinated complexes through their interaction with transition-metal salts in organic solutions. The oligomeric metal complexes (OMCs) were separated from the reaction mixture and investigated throu…
The exchange mechanism of proton and hole in protonic conductor CaZrO 3 has been investigated by photoemission spectroscopy. The Fermi level is higher by about 1.0 eV through proton doping, indicating that protons exchange with holes. The defect chemical calculation proves that the change of the number of the protons,…
Transmission electron microscopy (TEM) and Cryo-TEM were used to study the growth kinetics of poly(3-hydroxybutyrate) granules produced by in vitro polymerization. The in vitro formation of poly(3-hydroxybutyrate) uses a recombinant form of the PHA synthase to polymerize [R]-(–)-3-hydroxybutyryl-CoA. Since the in vitr…