Symmetry problems on raman scattering by pure and doped BaTiO3in the cubic phase

Abstract
In the last years, a controversy has developed as to whether the ferroelectric phase transition in BaTiO3 is of displacive or order-disorder type. Central to the resolution of this question is the interpretation of the A1(TO) phonon spectrum of the tetragonal phase which seems to remain in the cubic.

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