Aktan O. Melting Thermodynamics of Lamellar Crystals

In the thesis the statistical theory of lamellar crystals melting is constructed. It is proved in this objects two phases can exist: not concentrated (A) and concentrated (B) - ac-cordingly with small and big ( approximately some percents) of supervacancies. It is estab-lished for some values of the volume and the temperature the phase transition A>B is hap-pened. Since around a supervacancy the lattice is ruined this transition is identified with melt-ing. It is shown for lamellar polycrystals where lamellae are not oriented the energy of the de-formation in the chains direction forms the important part ( 80 percents) of the melting heat. It is established in the melt which was formed from a lamellar crystal two types of the structure regions exist namely with divided and entangled chains.