This article reviews the polarizability model and its applications to ferroelectric perovskite
oxides. The motivation for the introduction of the model is discussed and nonlinear oxygen …

A quadrupole coupling induced T 47 i and T 49 i satellite background which transforms into
well-defined satellite lines below T c in the ferroelectric phase has been observed in the …

The dielectric response to infrared waves polarized along the tetragonal axis of a
ferroelectric single-domain crystal of BaTiO 3 was determined by time-domain THz …

It has recently been shown by NMR techniques that in the high-temperature cubic phase of
BaTiO 3 the Ti ions are not confined to the high-symmetry cubic sites, but rather occupy one …

The dynamical properties of ferroelectric perovskites have typically been classified as being
either of order-disorder or displacive type. Here we show that this simple scheme is not …

The anharmonic lattice dynamics of oxide and halide perovskites play a crucial role in their
mechanical and optical properties. Raman spectroscopy is one of the key methods used to …

Raman spectroscopy has been used to study the ferroelectric tetragonal to paraelectric
cubic phase transition T c in undoped Ba Ti O 3 (BT) and (Ba 0.92 A 0.08) Ti O 3 [where A …

The lattice dynamical properties of Ba x Sr 1− x TiO 3 single crystals with x= 0.05, 0.1, 0.2,
0.35, and 0.5 have been studied by Raman spectroscopy in the temperature range 5–300 K …

The transition temperatures of molecular ferroelectrics are usually lower than those of
inorganic ferroelectrics due to weaker electron–electron and electron–phonon interactions …

The polarization clusters existing in both the ferroelectric and the paraelectric phase of B a T
i O 3 are directly observed and characterized for the first time by a picosecond soft x-ray …