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Catalytic effects of metals, which are often involved in the fabrication of silicon nitride product, on the direct nitridation of silicon were investigated. Silicon granules impregnated with 0.125–2.0% by mass of ytterbium, yttrium, calcium, lutetium, magnesium or cerium were nitrided in a tubular flow reactor operated at temperature in the range of 1300–1390°C. Enhanced selectivity of α-silicon nitride...
Thermal decomposition of titanium (IV) n-butoxide (TNB) in organic solvents yields nanosized anatase titania without the contamination of other phases. The formation of anatase titania crystals and their phase transformation are investigated by using X-ray diffraction (XRD), SEM, BET techniques. It is suggested that anatase titania synthesized in 1,4-butanediol is the result from direct crystallization...
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