publish year
                
            keyword
                
                        soft mode 3
                        A2BX4-type crystal 1
                        acoustic and optical branch 1
                        anticrossing 1
                        dispersion relation 1
                        double-minimum potential 1
                        dynamic susceptibility 1
                        ferroelectric phase transition 1
                        incommensurate transition 1
                        over-damped 1
                        phonon spectrum 1
                        proton tunnel 1
                        two-sublattice model 1
                
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            school
                
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