Structural, dielectric and magnetic properties of multiferroic (1-x) La0.5Ca0.5MnO3-(x) BaTi0.8Sn0.2O3 laminated composites

TL;DR

This study develops lead-free multiferroic laminated composites combining ferromagnetic La0.5Ca0.5MnO3 and ferroelectric BaTi0.8Sn0.2O3, demonstrating enhanced dielectric, ferroelectric, and magnetic properties suitable for multifunctional device applications.

Contribution

It introduces a new laminated composite structure with specific proportions, showcasing successful synthesis and improved multiferroic properties over pure materials.

Findings

Laminated composites exhibit multiferroic behavior with ferroelectric and magnetic hysteresis.

Enhanced dielectric constant due to Maxwell-Wagner polarization.

Successful structural integration confirmed by X-ray and SEM analysis.

Abstract

High performance lead-free multiferroic composites are desired to replace the lead-based ceramics in multifunctional devices applications. Laminated compounds were prepared from ferroelectric and ferromagnetic materials. In this work, we present laminated ceramics compound by considering the ferromagnetic La0.5Ca0.5MnO3 (LCMO) and the ferroelectric BaTi0.8Sn0.2O3 (BTSO) in two different proportions. Compounds (1-x) LCMO-(x) BTSO with x=1 and 0 (pure materials) were synthesized by the sol gel method and x=0.7 and 0.5 (laminated) compounds were elaborated by welding appropriate mass ratios of each pure material by using the silver paste technique. Structural, dielectric, ferroelectric, microstructure and magnetic characterization were conducted on these samples. X-ray scattering results showed pure perovskite phases confirming the successful formation of both LCMO and BTSO. SEM images evidenced the laminated structure and good quality of the interfaces. The laminated composite materials have demonstrated a multiferroic behavior characterized by the ferroelectric and the ferromagnetic hysteresis loops. Furthermore, the enhancement of the dielectric constant in the laminated composite samples is mainly attributed to the Maxwell-Wagner polarization.