A discrete lattice plane, nearest neighbor, broken bond model withconstant bond energies, which had been used to calculate the energy of coherentinterphase boundaries in substitutional alloys was extended to a ternarysubstitutional-interstitial system to study the chemical interfacial energy betweena f.c.c. solid solution and a B1(NaCl) compound. When the regular solutioninteraction coefficient of substitutional(metal)atoms is .positive, interstitial(non-metallic) atoms which have different bond energies with the two metal atomstend to increase both the composition difference and the interfacial energy. Evenwhen the interaction coefficient of metal atoms is negative, a miscibility gap anda gradual composition change across the interface occur. The anisotropy of theinterfacial energy varies widely according to the magnitude of interactionbetween the metal and the non-metallic atoms.
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