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Effect of alkaline-earth fluorides on the nitridation of silicon

Journal Article · · Mater. Res. Bull.; (United States)
Effects of one per cent of alkaline earth fluorides (BaF/sub 2/, CaF/sub 2/, SrF/sub 2/) on the first stage nitridation of silicon have been studied. The fluorides enhance the reaction rate and change the parabolic kinetics for silicon-nitrogen reaction to a linear kinetics. The accelerating effect being in the order BaF/sub 2/ > CaF/sub 2/ > SrF/sub 2/ with activation energies of 96.23, 146.44 and 251.04 kJ/mole, respectively, as compared to 385.43 kJ/ mole for silicon-nitrogen reaction without additive. Thermodynamic considerations reveal that the fluorides accelerate the reaction by removing the SiO/sub 2/ layer formed on the silicon grain.
Research Organization:
Central Glass and Ceramic Research Institute, Jadavpur University, Calcutta
OSTI ID:
5041768
Journal Information:
Mater. Res. Bull.; (United States), Journal Name: Mater. Res. Bull.; (United States) Vol. 4; ISSN MRBUA
Country of Publication:
United States
Language:
English