  From the phase diagram as proposed by Lei et.al., [J. App. Phys 101, 084105
(2007)] a $BaSn_{0.15}Ti_{0.85}O_{3}$ is chosen showing a diffuse phase
transition between cubic to rhombohedral (C-R) near room temperature.
Dielectric analysis confirms a phase transition near room temperature ($T_{C}$
$\approx$ 290 K) and also frequency dispersion in dielectric constant is
observed towards low temperature. Polarization and first-order reversal curves
(FORC) suggest that the system is in re-entrant phase at low temperatures. Put
together, all these electrical characterization results points toward the
relaxor behavior in the re-entrant phase. Local probe techniques such as x-ray
absorption near edge spectroscopy, Raman and Mossbauer spectroscopy are
employed to investigate the local environment changes around this region of low
temperature dielectric anomaly. A simple ferroelectric exchange model
explaining the low temperature re-entrant behavior is presented from these
results.
