Interaction of benzene with boron trichloride at 800°C yields a graphite-like metallic solid of composition BC3, and chlorine-pyridine mixtures at 800 "C give a nitrogen-carbon also having a graphite-like structure.
Using the high resolution transmission electron microscopy techniques of weak-multibeam dark-field and direct lattice imaging, platinum particles ranging in size from 0.8nm to 50nm were imaged and their surface structure characterized. The platinum crystallites were evaluated for specific catalytic activity with respect to crystallite size.It was found that the rate of electrochemical oxygen reduction decreased for catalysts having a particle size of less than 3.5nm. We suggest that the dominating (111) surfaces and rough (110) regions on these small particles are less active than (100) and (100) vicinal planes.
New structural relatives of graphite with the composition BxCyNx have been synthesized from the interaction of boron trichloride, acetylene and ammonia at 400-700°C. A hexagonal layer structure type is indicated by X-ray and electron diffraction data. Binding energies of ls electrons (ESCA) for B, c and N indicate that each graphite-like sheet is a composite of all three elements. ~he mate~ial of approxi~at7 composition Bo.35c0.30N0.35 1s a sem1conductor and 1s 1ntercalated by both strong reducing and oxidizing agents. MATERIALS INDEX: boron-carbon-nitrogen graphites.
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Thin films of C60, 2.5-μm, have been shocked isentropically to 69 GPa, about 2200 K, and thermally quenched at rates up to 1011 K/s. The recovered specimen is transparent with a crystallographic habit, or ‘‘tilelike’’ structure, but it slowly transforms to a black highly disordered carbon at the ambient condition. The selected area electron diffraction patterns suggest that the transparent carbon phase contains an amorphous cubic diamond and n-diamond crystallites sized 50–350 Å in diameter.
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