Abstract
Abstract The ferroelectricity in HCl and DCl crystals is discussed considering the dipole interaction among the constituent ions. It is found that the higher order Lorentz correction due to the lattice strain is required to explain the ferroelectricity of the crystals. Then the dipole interaction in the b-axis is proved to be the strongest one, which corresponds to the ferroelectric axis as reported by experiment. The 3D Ising model taking account of the twelve equilibrium positions is also proposed based upon the Maxwell-Boltzmann statistics to discuss the phase transition.
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