Room Temperature Structural, Magnetic and Dielectric Characteristics of La Doped CuO Bulk Multiferroic

TL;DR

This study investigates how La doping affects the structural, magnetic, and dielectric properties of CuO ceramics at room temperature, revealing enhanced dielectric constant, reduced leakage current, and microstructural improvements.

Contribution

It provides new insights into La doping effects on CuO's properties, including microstructure, lattice strain, and multiferroic behavior, using comprehensive characterization techniques.

Findings

La doping increases dielectric constant over threefold.

La doping reduces lattice parameters and induces strain.

Enhanced magnetic and dielectric properties are correlated with grain size.

Abstract

In this manuscript, we report room temperature structural, microstructural, optical, dielectric, and magnetic properties of CuO and Cu0.995La0.005 ceramics, synthesized by solid-state reaction method. La doping in CuO leads to the evolution of compact and dense microstructure with reduced porosity. Due to noticeable differences in the ionic radii of, La doping creates vacancy defects which induce considerable strain in the CuO lattice resulting in a reduction in the lattice parameters and cell volume. However, both ceramics processes a similar monoclinic structure with the C2/c space group. Detailed characterization using XPS, Raman, and FTIR spectroscopy confirmed the incorporation of the La3+ in CuO lattice. Interestingly, La doping enhances the dielectric constant by more than three times and results in a reduced leakage current. The onset of a large dielectric constant is attributed to dense microstructure and strain/distortion in CuO lattice after La doping. Additionally, the band-gap of Cu0.995La0.005 ceramics decreases which is attributed to increased vacancy defect concentration that creates intermediate dopant energy level within bandgap of CuO matrix. Furthermore, improvement in magnetic and dielectric properties is also discussed and correlated with the grain size in La-doped CuO.