Displacive phase-field crystal model

A phase-field crystal model that spontaneously undergoes displacive phase transitions is introduced by explicitly studying a two-component two-dimensional square crystal reminiscent of a perovskite. When the intercomponent free energy is a simple polynomial, the crystal undergoes displacive transitions in the \ensuremath{\langle}10\ensuremath{\rangle}and \ensuremath{\langle}11\ensuremath{\rangle}directions. When the interaction is a...