Four samples of (Y1−xCex)3(Al1−yGay)5O12 (where x=0.01, 0.02 and y=0, 0.5) were synthesized via the simple, efficient combustion synthesis method in order to determine the effect of substituting Ga for Al on the temperature-dependent fluorescent lifetime. X-ray diffraction(XRD) data show that the average crystallite size is 20-30nm and that the gallium-doped samples have longer lattice constant...

When dark-grown plants are illuminated, the characteristic morphology of the etioplast changes. The tubules of the paracrystalline prolamellar body disperse as the membranes reorganize and 'grow out' as 'perforated' thylakoids. Similar changes are expected during the greening of the isolated etioplasts of Avena. Under certain preparative conditions the morphological changes vary from those prev...

YVO4:Eu nanocrystals synthesized by direct precipitation reaction. The morphologic transformation of the nanocrystals as the results of thermal treatments were analyzed using optical spectroscopy. A red shift of the fluorescence lines with the increase of the crystallite size was observed. The kinetics of the D0 level of Eu3+ is also analyzed.

The crystal structure and magnetic properties of Fe/AI multilayered films prepared using the ion beam sputtering method have been investigated. The crystallite orientation and magnetism of Fe layers were found to depend significantly on A1 layer thickness. This resutt may be caused by the crystallographic interaction between Fe and A1 layers.

Fully aromatic polyimides are synthesized via solid-state polymerization of the corresponding monomer salts. The crystal structure of salts shows strong hydrogen bonding of the reactive groups and thereby paves the way for solid-state transformations. The polycondensation yields copies of the initial salt crystallite habits, accompanied by the development of a porosity especially suited for CO2.

Monoclinic CuO crystallite in grams has been obtained from resin bound Cu(II)-1,10-phenanthroline complex, R(-)[Cu(1,10-phen)(2)](2+) that becomes a recyclable catalyst for oxidative phenol coupling (OPC) reaction. Thus an exclusively intuitive blue fluorescing perylene derivative is derived from colorless 2,7-dihydroxynaphthalene (2,7-DHN) in high yield.

The ultraviolet energy distribution of quasars shows a sharp steepening of the continuum shortward of 1000 Å (rest-frame). We describe how we came to consider the possibility that this continuum break might be the result of absorption by carbon crystallite dust grains.

Fe2O3-Al2O3 compounds with different Fe/Al compositions were synthesized by coprecipitation (CP) method and calcined at 300°-1000°C. The formation of crystalline phases (e.g., maghemite, hematite), transformation temperature, specific surface area, lattice parameter, crystallite size, magnetic properties of iron oxide were all affected by the component ratio and thermal treatment.