Materials Literature
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In order to determine types of the orbital ordering in manganites, we study theoretically the polarization dependence of the anomalous X-ray scattering which is caused by the anisotropy of the scattering factor. The general formulae of the scattering intensity in the experimental optical system is derived and the atom…
A novel birefringent (alpha) -BaB<SUB>2</SUB>O<SUB>4</SUB> crystal with 40 mm in diameter, 35 mm in height has been grown successfully in our laboratory by Czochralski method. The proportion of B<SUB>2</SUB>O<SUB>3</SUB> and BaO of starting materials, crystal cracking and the transmission spectrum of (alpha) -BaB<SUB>…
An experimental and theoretical study of the interactions between urea and NO under lean selective noncatalytic reduction conditions has been performed. The experiments were conducted in an isothermal quartz flow reactor at atmospheric pressure in the temperature range 700−1500 K. The influence of the temperature, oxy…
Abecarnil, a partial agonist of the benzodiazepine receptor, crystallizes in three modifications, A, B, and C. Depending on the solvent, the form crystallized in an unseeded process is one of the two metastable forms A or B. Isopropyl acetate was chosen as solvent for the crystallization of the drug substance Abecarni…
Atomic Magnetic Moments Interaction Between Two Spins Magnetism Associated with the Itinerant Electrons The Magnetization Curve Hyperfine Interactions Nuclear Magnetic Resonance Magnetic Resonance in Magnetic Materials Appendices Index.
Microelectrodes were used to measure oxygen profiles and local mass transfer coefficient profiles in biofilm clusters and interstitial voids. Both profiles were measured at the same location in the biofilm. From the oxygen profile, the effective diffusive boundary layer thickness (DBL) was determined. The local mass t…
We investigate the thermoelectric properties of some semiconducting Chevrel phases. Band structure calculations are used to compute thermopowers and to estimate of the effects of alloying and disorder on carrier mobility. Alloying on the Mo site with transition metals like Re, Ru or Tc to reach a semiconducting compos…
For the first time an active surface phase was characterized by means of surface-sensitive X-ray absorption in the soft X-ray region—the oxidation of methanol on copper under practicle conditions was used as an example—and its function was correlated with the catalytic activity of the system. This phase is not merely…
A strong effect on the redox properties of the porphyrin moiety is exerted by the four fullerene groups in 1 (R=C12H25). The potential of the first oxidation step is significantly more anodic than that for an analogous porphyrin with no fullerene substituent. Compound 1 was prepared by a BF3-catalyzed reaction between…
Mit zunehmender Zahl bereits gebundener Dicarbonsäuremoleküle wird die Bindung von weiteren bei der Titelverbindung (schematische Darstellung eines 1:4-Komplexes siehe rechts) begünstigt. Die Assoziationskonstante für die Bindung des ersten Gastmoleküls ist klein, da die durch die Bindung bedingte Erhöhung der Gibbs-E…
Short C−H⋅⋅⋅halogen distances in the crystals and remarkably low-field shifts of the 1H NMR signals of the bridging hydrogen atoms are the characteristic features of the intramolecular C−H⋅⋅⋅halogen hydrogen bonds that are exhibited by several new (1,4-diaza-1,3-diene)titanium and -niobium halides (the structure of 1…
Resistance to sulfur, long life, and high activity are characteristic of silver-containing zeolite catalysts with Brønsted acid centers, which can be used for the reduction of NO2 to N2 in the presence of hydrocarbons [Eq. (1)]. In the proposed reaction mechanism, N2 formation proceeds via intermediate nitro, amino, a…
Analysis of hard a-C:H films with low stress prepared by methane plasma decomposition is reported. Films with hardness as high as 14 GPa and stress as low as 0.5 GPa were obtained. These films have a high Raman Id/Ig ratio (∼1.0), and small Tauc’s band gap (∼0.4 eV). This letter also supplies strong evidence that the…
A very large positive magnetoresistance (MR) has been discovered in a Fe3O4/SrTiO3/ La0.7Sr0.3MnO3 heterostructure for the transport perpendicular to the layer planes and applied magnetic field in the film plane. The observed MR features do not show any obvious correlation with the hysteresis behavior of the ferromagn…
The static value of the effective dielectric constant in a thin film capacitor is simulated by means of the local field theory. The value of it shows a sharp decrease as the film thickness is decreased in an ultrathin film geometry. This phenomenon is due to the size effect intrinsic to a thin film structure and has n…
Using Kohn-Sham wave functions and their energy levels obtained by density-functional-theory total-energy calculations, the electronic structure of the two c(2x2) phases of Na on Al(001) are analysed; namely, the metastable hollow-site structure formed when adsorption takes place at low temperature, and the stable sub…
Optical temperature sensing using upconversion fluorescence emission in Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glass excited at 1.06 μm is reported. Temperature measurements in the region of 20–225 °C with a resolution of approximately 0.5 °C using excitation powers of a few tens of milliwatts were obtained. The t…
Sensitive CaSO<inf>4</inf>:Dy and CaSO<inf>4</inf>:Tm thermoluminescent (TL) phosphors, meeting the criteria for TL dosimetry, were produced using the mineral gypsum (CaSO<inf>4</inf>2H<inf>2</inf>O) of Iran. The results of the optimisation of concentrations of the activ…
During catastrophic processes of environmental variations of a thermodynamic system, such as rapid temperature decreasing, many novel and complex patterns often form. To understand such phenomena, a general mechanism is proposed based on the competition between heat transfer and conversion of heat to other energy form…
Infrared reflectance of alpha'-NaV2O5 single crystals in the frequency range from 50 cm-1 to 10000 cm-1 was studied for a, b and c-polarisations. In addition to phonon modes identification, for the a-polarised spectrum a broad continuum absorption in the range of 1D magnetic excitation energies was found. The strong n…