Intercorrelations of structural-magnetic properties of La0.7A0.3MnO3 (A=Ba, Sr, Pb) manganites and the energy harvesting applications of their flexible nanocomposite films

Ferromagnetic La0.7Ba0.3MnO3 (LBMO), La0.7Sr0.3MnO3 (LSMO) and La0.7Pb0.3MnO3 (LPMO) nanoparticles (NPs) were prepared by sol-gel auto-combustion method. Microstructural analysis of these NPs was done using electron microscopy. The variation of crystallite size and the corresponding lattice strain of the prepared NPs were analyzed with Williamson-Hall plot. Elemental composition and oxidation states of the prepared NPs were analyzed with x-ray photoelectron spectroscopy. Comparative studies on the variation of angle Mn-O-Mn bond angle and the Mn-O bond length with the increase of mean radius of A-site ion are reported which in turn alter the structural and magnetic properties of LBMO, LSMO and LPMO NPs. Further, 0.5 vol% (0-3) LBMO/P(VDF-TrFE), LSMO/P(VDF-TrFE) and LPMO/P(VDF-TrFE) flexible nanocomposite films were prepared by solution casting method and these were used to show direct magnetoelectric effect-based energy harvesting from magnetic noise generated from cooling/exhaust fan and electric cable wire carrying current at 50 Hz.

Automated summary

Ferromagnetic La0.7Ba0.3MnO3 (LBMO), La0.7Sr0.3MnO3 (LSMO), and La0.7Pb0.3MnO3 (LPMO) nanoparticles were synthesized using the sol-gel auto-combustion method. Microstructural analysis revealed that the crystallite size and lattice strain of the nanoparticles changed with the increase of the mean radius of the A-site ion, influencing their structural and magnetic properties. Additionally, flexible nanocomposite films were prepared and used for energy harvesting based on the magnetoelectric effect from magnetic noise generated by cooling/exhaust fans and electric cable wires.