In a paper, it was mentioned that the density of states shows considerable
hybridization among Ti 3d, Bi 6p, and O 2p states indicating covalent nature of the
bonds leading to ferroelectric instability.
"quantum fluctuations"
(https://en.wikipedia.org/wiki/Quantum_paraelectricity)
The following might give some idea/help
Ferroelectricity
(https://www.sciencedirect.com/topics/materials-science/ferroelectricity)
One is related to BaTiO3
Ferroelectric Instability under Screened Coulomb Interactions
(https://arxiv.org/ftp/arxiv/papers/1208/1208.5830.pdf)
"ferroelectric phase and conductivity can coexist", "ferroelectric instability requires only a short-range portion of the Coulomb force with an interaction range of the order of the lattice constant"
Ferroelectric Instability and Dimensionality in Bi-Layered Perovskites and Thin Films
(https://downloads.hindawi.com/journals/acmp/2012/714625.pdf)
"the mechanism of ferroelectric phase transition of SBT, it seems plausible that the ferroelectric interaction is still prominent but shows a crossover
from ferroelectric to antiferroelectric interaction in perovskite ultra-thin films along the tetragonal axis."
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