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The temperature dependence of dynamic effective charges carried by Ti and Nb ions which are the movable atoms involved in the ferroelectric phase transition of BaTiO3 and KNbO3, respectively, are reported, as deduced from TO-LO splittings of polar lattice modes, including soft modes. Results below the semiconducting-metal phase transition of NbO2 are also discussed

ROLE OF POLAR PHONONS IN THE CHEMICAL BOUND AT STRUCTURAL PHASE TRANSITIONS CHARACTERIZED BY REPETITIVE FOURIER SPECTROSCOPY