Abstract
Abstract Phase transition of SrTiO3 is discussed by taking account of the interionic forces, namely, Coulomb, van der Waals' and overlap interactions among the constituent ions. It is concluded that the structural phase transition in SrTiO3 can be explained by considering the dipole interaction among the ions accompanied by the spontaneous lattice deformation and also the TiO6 rotation. The specific behavior of a, b and c axes at low temperature below Tc is also explained by giving consideration of the lattice deformation due to thermal contraction.
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