Effective strategy of optimized dielectric, energy storage and piezoelectric performances in La3+and Sr2+ co-doped PIMNT 42/26/32 relaxor ferroelectric ceramics

The research attempts to delineate on the structural, dielectric, ferroelectric, piezoelectric, strain and energy storage properties of the ternary 42 Pb(Mg1/3Nb2/3)O3- 26 Pb(In1/2Nb1/2)O3 - 32PbTiO3 (pristine PMINT 42/ 26/32) and 1 wt % La2O3 and x wt. % SrCO3 (x = 2, 4 and 6) co-doped PMINT 42/26/32-1LaxSr relaxor ferroelectric (RFE) ceramics which are synthesized via conventional solid state reaction method. The single perovskite phase of all the sintered ceramics were confirmed by powder X-ray diffraction analysis. Microstructure analysis revealed the reduction in average grain size from 5 & mu;m to 0.68 & mu;m as a function of aliovalent (La3+) and isovalent (Sr2+) dopants concentration. PMINT 42/26/32-1La6Sr exhibited high dielectric constant (& epsilon;m-14,508) at 281 degrees C with low dielectric loss (tan & delta;) due to the smaller grain size of the sample. La and Sr codoped PMINT 42/26/32 RFE ceramics revealed a slim polarization versus electric field (P-E) hysteresis loops with optimized energy storage density of Jreco - 0.732 J/cm3 and energy storage efficiency of ɳ - 92.5% achieved for PMINT 42/26/32-1La4Sr and PMINT 42/26/32- 1La6Sr ceramics, respectively. The enhanced piezoelectric charge coefficient d33 (- 564 pC/N) and piezoelectric strain coefficient d33* (- 493 pm/V) were obtained for PMINT 42/26/32-1La4Sr and PMINT 42/26/32-1La2Sr, respectively. This work highlights the enhanced piezoelectric and energy storage properties of ternary PMINT 42/26/32 RFE ceramics by co-doping La and Sr dopants.