Effect of Ionic Radii Variation on the Structural, Electrical, Dielectric, and Magnetic Characteristics of Orthochromite RCrO3 (R = La, Y, Gd).

The ionic radius of R3+ ion plays a significant role in enhancing the structural, electrical, and dielectric properties of rare-earth chromites RCrO3; In this present study, RCrO3 (R = La, Y, Gd) was synthesized using the solid-state route reaction method. The XRD pattern confirmed the formation of a single phase. Refined XRD data revealed an orthorhombic crystal structure with the space group Pbnm at room temperature, along with the corresponding lattice parameters. Further analysis using diffuse reflectance UV-visible spectroscopy showed absorption peaks and a dual direct band gap, suggesting a semiconducting nature for the samples. To investigate the electrical properties of RCrO3, dielectric and impedance spectroscopy measurements were conducted at room temperature. Notably, the variation of ionic radii R3+ plays a significant role in the structural, optical, and dielectric properties of the material. Furthermore, AC conductivity measurement conducted in the higher frequency range provides insights into the conduction mechanism of the sample, and M- H curve indicates ferromagnetic behavior, and this variation is attributed to the effect of ionic radii. [ABSTRACT FROM AUTHOR]