Probing the effect of LaFeO3 on the structural, electrical, and dielectric properties of Sr0.8Sn0.2Bi2Nb2O9 processed through solid state route method.

SrBi 2 Nb2O 9 belongs to the class of Aurivillius layered ferroelectric oxide materials and this article offers a suitable method for understanding the structural and electrical properties of this class material for industrial application. With this aim we have synthesized LaFeO 3 (LFO) doped Sr 0.8 Sn 0.2 Bi 2 Nb 2 O 9 (SBN) novel ceramic by solid state route using ball milling in an ethanol medium for 20 h with 200 rpm, followed by single-step microwave sintering. For better phase formation, the obtained powders are compressed into cylindrical pellets and fired at 1000 °C for 5 h. The sample was critically analyzed using powder X-ray diffraction data confirming the distorted perovskite structure. The dielectric properties were studied in a frequency range of 10 Hz to 2 MHz at different temperatures revealing many exciting results. Further analyzing the impedance spectroscopy gives an idea about the contribution of different electrically dynamic regions in different conduction processes. • Synthesized lead-free ferroelectric LSBN composition using solid-state route method, which is very challenging to execute. • The Uniform deformation model (UDM) has been used to study the effect of strain and crystallite size on peak broadening. • Impedance spectroscopy reveals that the relaxation mechanism in LSBN composition is a thermally governed process. • Contribution of capacitive elements to the total impedance spectra has also been investigated by employing modulus spectroscopy. [ABSTRACT FROM AUTHOR]