Abstract
Based on an analysis of the optical properties of barium titanate crystals in the paraelectric phase, the range of possible combinations of the values of effective charges and dipole electronic polarizability of Ba, Ti, and O ions at T = 573 K was found. The potential profile in the vicinity of positions of Ti ions is analyzed and shown to be multiminimum under certain conditions. The most likely directions of titanium ion displacements with respect to the central position are the [100], [010], and [001] axes.
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