The great sensitivity of ferroelectrics to chemistry, defects, electrical boundary conditions and pressure arises from a delicate balance between long-range Coulomb forces (which favour the ferroelectric state) and short-range repulsions (which favour the nonpolar cubic structure).
(Ref: Ronald E. Cohen, Origin of ferroelectricity in perovskite oxides, nature)
Dear Sonu Sarraf . See the following useful RG links: Article Multiferroic crossover in perovskite oxides
https://typeset.io/papers/origin-of-ferroelectricity-in-perovskite-oxides-n9778jbuzm
https://www.nature.com/articles/358136a0
Kindly see also the following useful RG links: Article Ferroelectric Instability Under Screened Coulomb Interactions
https://pubs.rsc.org/en/content/getauthorversionpdf/C5TC03856A
https://books.google.com.om/books?id=m-GdDwAAQBAJ&pg=PA19&lpg=PA19&dq=how+long-range+Coulomb+forces+favor+the+ferroelectric+state+in+the+oxide+perovskites?&source=bl&ots=kA4R5WlOfp&sig=ACfU3U35oyOjIvHJK3vBTHqv5wwWk5LeqQ&hl=en&sa=X&ved=2ahUKEwiO1rXS5Kz4AhW-SPEDHYJXA4IQ6AF6BAgZEAI
Also check please the following useful RG links: Article Electronic and Structural Properties of ABO3: Role of the B-...
https://arxiv.org/pdf/1205.5377
http://iopscience.iop.org/1367-2630/16/1/015030/pdf/1367-2630_16_1_015030.pdf
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