Structural, Dielectric and Magnetic Characterization of Double Perovskite BaLaCuSbO6

Abstract

This work highlights a comprehensive investigation of the structural, dielectric and magnetic properties of the double perovskite BaLaCuSbO₆. The material was synthesized via the solid-state reaction technique. X-Ray diffraction (XRD) and Rietveld refinement analysis confirmed that the material adopts a monoclinic structure with the I2/m space group at room temperature.The crystallite size, calculated using both the Debye-Scherrer equation and the Williamson-Hall plot, revealed nanoscale dimensions.Electron density mapping and SEM analysis confirmed structural integrity and uniform grain distribution. Dielectric studies performed over the frequency range of 10 Hz to 10 MHz exhibited strong dispersionat low frequencies, stabilizing at higher frequencies, consistent with Maxwell-Wagner polarization. Both impedance and conductivity analysis demonstrated that the material exhibits negative temperature coefficient of resistance (NTCR) characteristics, confirming its semiconducting nature at high temperatures. Modulus spectroscopy confirmed a non-Debye relaxation mechanism, and AC conductivity analysis suggested thermally activated charge transport. Magnetic characterization revealed the anti-ferromagnetic behavior of the material at room temperature,as observed from the nature of magnetic hysteresis loop. These findings suggest that BaLaCuSbO₆ is a promising candidate for applications in electronic and magnetic devices.