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The problems of the Thomson-Freundlich equation in the solid state sintering are pointed out, which has been used as the relationship concerned with the chemical potential difference, surface curvature and vacancy concentration gradient. Based on the view point of the variation in total system energy as the driving force of the solid state sintering, the new concept of the reduction in local surface energy is introduced, and with the new introduced concept of the reduction in local surface energy, the change of surface configuration by surface diffusion is two dimensionally discussed.

The Driving Force and the Process of Mass Transport in the Solid State Sintering