Investigation of dielectric properties, impedance and AC conductivity of Sm₂O₃@SiO₂ core shell nanocomposites

In this study, we design and fabricate Sm₂O₃@SiO₂ core–shell nanocomposites to examine their dielectric behavior under varying frequencies and temperatures. Powder X-ray diffraction and Fourier Transform-Infrared analyses confirmed the phase composition and functional groups, respectively, while Transmission Electron Microscopy analysis indicated the formation of core–shell structure with shell thickness of approximately 34 nm. The M-H hysteresis loop revealed a soft paramagnetic nature at room temperature. X-ray photoemission spectroscopy confirmed the chemical states and cation distribution in the material. The dielectric constant and dielectric loss exhibited an increasing trend when temperature was increased from 323 and 673 K in the observed frequency range.