Abstract
Because of the basic importance of intercrystalline energies in determining properties of polycrystalline bodies, relative intercrystalline interfacial energies were determined in many alkali halide systems by measurement of the angles at which intercrystalline boundaries meet one another at equilibrium. The energies of boundaries between two crystals of the same phase were found to vary from 0.2 to l.3, relative to the NaF intercrystalline energy. The relative energies of boundaries between two dissimilar crystals varied only from 0.7 to 1.0. From the equilibrium angles and the liquid-liquid interfacial energy in the system NaF(solid) -Te(liquid) -CsCl(liquid), the absolute energy of the average NaF grain boundary was determined to be 306 plus or minus 15 ergs/ cm2. Generally, no correlation was found between intercrystalline energies and other basic parameters.
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