  Lead-free Ba0.9Sr0.1Ti0.9Sn0.1O3 (BSTSn) ceramic was prepared by the sol gel
method. X-ray diffraction measurement at room temperature reveals the
single-phase formation with tetragonal structure refined in the P4mm space
group. Raman spectroscopy analysis at room temperature was used to confirm the
structure of BSTSn ceramic sintered at 1420C during 5h. The dielectric
measurements were examined in the temperature range [-90 250 C] and the
frequency range of [100Hz 1MHz]. The maximum dielectric constant was found to
be 5484 (1kHz) at room temperature. The diffuse phase transition characteristic
at 1kHz was ascribed by the modified Curie Weiss law. Macroscopic polarization
field (P E) hysteresis loops recorded at room temperature (RT) confirm the
ferroelectric nature of BSTSn ceramic. Impedance spectroscopy analysis of BSTSn
sample in the temperature range 300 380 C reveals the presence of two
relaxation contributions originated from grains and grain boundaries.
Activation energies of grain and grain boundaries resistances were deduced in
order to determine the conduction mechanism of the studied sample.
