Three Phase Transitions of Ising Model

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Abstract
A statistical model which has two and three phase transition points is investigated. In these phase transitions, there occurs with increasing temperature a transition from the disordered state to the ferromagnetic or antiferroagnetic ordered state and then a reverse process. The model for the first transition finds application to the study of ferroelectricity. Rochelle salt has the ferroelectric ordered state in the narrow range of temperature (from about -18 °C to 25 °C, called, respectively, the lower and the upper Curie points). This property of the Rochelle salt can be explained by the Ising system model, since the phase transitions of Rochelle salt can be considered as an order-disorder type transition.

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