Effect of Sr substitution on electrical polarization of Ba_1-xSr_xTiO₃ (x = 0.0, 0.2, 0.6, and 0.8) perovskite materials

Abstract

This study aims to investigate the electrical polarization of Ba1-xSrxTiO3 (x = 0.0, 0.2, 0.6, and 0.8) perovskite materials. The materials were synthesized using mechano-synthesis. The structural behaviour was assessed using X-ray diffractometer (XRD), revealing that all samples have a tetragonal perovskite structure with a lattice parameter that decreases with an increase in Sr. The electrical polarization was investigated using an electrometer, showing decreasing spontaneous and saturation polarizations as more Sr is substituted into the Ba sites of (Ba,Sr)TiO3. The decreasing lattice parameters and spontaneous and saturation polarizations in these materials indicate that the crystal structure changes from tetragonal to cubic as more Sr is added.

Structural and dielectric characterization of synthesized nano-BSTO/PVDF composites for smart sensor applications

“…One possible explanation is that Ba 2+ has a greater ionic radius (149 pm) than Sr 2+ (132 pm). 32 Similarly, the unit-cell parameters ''a'' and ''c'' decrease with increasing the strontium ratio, following the trend expected from Vegard's rule. 16 The dislocation density (d) in eqn ( 6) is found to have an inverse behavior of the crystallite size as expected, with an increase in d causing a decrease in the R values.…”

Influence of heat-treatment temperature on structural and electrical properties for BaSrTiO3 compounds

“…It possesses crystalline properties similar to general perovskites with a cubic nature and with the chemical formula Ba 1-x Sr x TiO 3 [10]. The ferroelectric materials mentioned above, the solid solution composition of ferroelectric barium titanate (BaTiO 3 ) and paraelectric SrTiO3, BaSrTiO3 (BST) possess the best dielectric constant and have a relatively low loss over a wide range of frequencies, besides a low leakage current and large electric field tenability [11] [12].…”