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The phase purity and crystal structure of PLTA samples (synthesized viasol-gel process) were confirmed using synchrotron x-ray powder diffraction(wavelength, lmbda= 0.44573 A. Rietveld analyses of powder x-ray diffractiondata confirmed the tetragonal structure for compositions with more than 0.18and cubic structure for the sample with 0.25 composition. Temperature-dependentXRD was performed to investigate the structural change from tetragonal to cubicstructure phase transition. Raman spectroscopy at room temperature alsoconfirmed this phase transition with composition. Field emission scanningelectron provided information about surface morphology while an energydispersive x-ray spectrometer attached with FESEM confirmed the chemicalcompositions of samples. Temperature and frequency dependent dielectric studiesshowed that the tetragonal to cubic phase transition decreased from 680 K to175 K with the increase in the x from 0.03 to 0.25, respectively. This iscorrelated with the structural studies. Electric field dependent spontaneouspolarization showed proper ferroelectric loop for 0.06 to 0.18 belonging to atetragonal phase while after 0.25 composition the spontaneous polarizationvanishes.Bipolar strain versus electric field revealed a butterfly loop for0.06 to 0.18 compositions. Energy storage efficiency initially increasesnominally with substitution but beyond 0.18 composition enhances considerably.

Investigation of La and Al substitution on the spontaneous polarization and lattice dynamics of the Pb(1-x)LaxTi(1-x)AlxO3 ceramics