Materials Literature
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Ti−MCM41 catalysts prepared by anchoring titanocene onto the inner walls of MCM-41 exhibit high catalytic performance in the epoxidation of cyclohexene and in oxidation of bulky cyclic and aromatic compounds because of the presence, as revealed by means of XANES and EXAFS spectroscopy, of a high concentration of acces…
The structures, phase transformations, and dielectric properties of pyrochlore ceramics containing bismuth were studied. The relation between the orthorhombic and cubic pyrochlores in the Bi 2 O 3 ‐ZnO‐Nb 2 O 5 (BZN) system has been investigated. The effect of bismuth in distorted cubic pyrochlore structures is discus…
A model based on grain-boundary sliding control of the flow process of nano-crystalline materials is proposed. It is demonstrated that the agreement between the theory and the experimental results concerning both nanocrystalline metals and ceramics is quite satisfactory.
The vibrational properties of models of vitreous silica constructed by molecular-dynamics simulation with different interatomic potentials have been investigated. The static and dynamical structure factors of the model systems are in good agreement with experimental data. Partial and total vibrational densities of sta…
The atomic pair-density function of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.4)$ obtained by pulsed neutron diffraction indicates that their local atomic structure significantly deviates from the average structure, and that the local Jahn-Teller (JT) distortion persists eve…
An anhydrous single crystal of sodium zeolite X, Na 92 Si 100 Al 92 O 384, was exposed for 48 h to Na vapor at 225 °C. Its structure was determined by X-ray diffraction methods in the cubic space group Fd 3̄; a = 25.100(11) Å at 22 °C; R 1 = 0.071 and R 2 = 0.088 for the 544 reflections for which I > 3σ( I ). A total…