Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53349#.VL71MCzQrzE \ Author(s) Yu. A. Minaev Affiliation(s) Mining and Metallurgy Division, Russian Academy of Natural Science, Moscow, Russia. ABSTRACT The phenomena of the first order phase transition (two-dimensional melting) of grain boundary at temperatures 0.6 - 0.9 T S0 (of the solid state melting point), discovered by the author (1971), is a fundamental property of solid crystalline materials. This finding leads to a principal revision of the scientific concepts of the solid state of substance. The phenomenological description and justification of the finding are developed. The generalized equation of Clausius-Clapeyron type for two-dimensional phase transition was obtained by applying the mathematical tools of the film thermodynamics. The equation has been used for calculating the grain boundary phase transition(GBPhT) temperature T Sf of any...
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