Materials Literature
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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…
A color sensor device using conducting polymer poly(3-hexylthiophene) (PAT6), has been fabricated and characterized. The device consists of two photocells made of the same conducting polymer with different polymer thicknesses, and which exploits the difference in the photocurrent spectrum of the photocells. The color…
A simple, processable precursor to mullite can be synthesized in quantities of 100 g in a few hours by direct reaction of silica, aluminum hydroxide, and triethanolamine in ethylene glycol. To delineate a processing window whereby precursor shapes can be transformed into mullite, the chemical and phase microstructural…