Voscous slip along grain boundaries in chlorine-Doped silicon Nitride

摘要

The effect of chlorine doping on the anelastic-relaxation and torsional-creep behavior of a silicon nitride (Si_3N_4) polycrystalline body was studied. Two model polycrys- tals-one undoped and the other doped with a small frac- tion of chlorine-were investigated. Their microstructures consisted of equiaxed and well-faceted Si_3N_4 grains whose boundaries were separated by a continuous, nanometer- sized film of silica (SiO_2) glass.