Structural, dielectric and magnetic studies of (0-3) type multiferroic (1-x) BaTi0.8Sn0.2O3-(x) La0.5Ca0.5MnO3 (0 <x< 1) composite ceramics

TL;DR

This study investigates the structural, dielectric, and magnetic properties of (0-3) type multiferroic composite ceramics made from BaTi0.8Sn0.2O3 and La0.5Ca0.5MnO3, revealing enhanced dielectric and magnetic features and exploring magnetoelectric coupling.

Contribution

It introduces a sol-gel synthesis method for (0-3) multiferroic composites and provides detailed analysis of their phase, microstructure, magnetic, and dielectric properties, including magnetoelectric coupling.

Findings

Composites exhibit pure phases confirmed by Rietveld refinement.

Magnetic properties improve with increased La0.5Ca0.5MnO3 content.

Dielectric constant is higher than parent BaTi0.8Sn0.2O3.

Abstract

Multiferroic composites with the composition (1-x) BaTi0.8Sn0.2O3 - (x) La0.5Ca0.5MnO3 (x =0, 0.3, 0.5, 0.7, 0.9 and 1) were prepared by sol-gel techniques. Rietveld refinements of the composites with 0-3 and 3-0 type connectivities exhibit the formation of pure phases and confirm the fraction of the composite samples. It was found that the composites grain size decreases slightly with increasing the La0.5Ca0.5MnO3 content. Magnetic measurements of the composite ceramics exhibit a gradual increase in saturation and remanent magnetization with increasing La0.5Ca0.5MnO3 content. Dielectric data demonstrate that the composite materials show high values of the dielectric constant in comparison with the parent compound BaTi0.8Sn0.2O3 (BTSO). In addition, an attempt is made to measure the magnetoelectric coupling coefficient and to explain the negative permittivity and losses occurring in these materials at a certain frequency and temperature conditions.