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Layer 2 Barium Atom Oxygen Atom Titanium Atom
Consider Barium Titanate. This has a cubic structure above 120 degrees C.

Looking down this axis, we can observe the movement of atoms as it moves into a tetragonal structure.

½ 0,1 Barium Atom Oxygen Atom Titanium Atom
This view shows the cubic nature of Barium Titanate.

The movement of atoms changes the phase from the cubic phase to the tetragonal, resulting in the production of a dipole moment along the [100] direction.

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The movement of atoms changes the phase from the cubic phase to the tetragonal, resulting in the production of a dipole moment along the [100] direction.