Electric Modulus Study of Double Perovskite Gd₂NiZrO₆

A double perovskite oxide gadolinium nickel zirconate, Gd₂NiZrO₆ is synthesized by a solid-state reaction technique. The X-ray diffraction pattern of the sample at room temperature shows a monoclinic phase. The frequency-dependent dielectric dispersion of the sample is investigated in the frequency range 100 Hz–1 MHz and in a temperature range 303 K–673 K. An analysis of the complex electric modulus (M′ and M″) with frequency is performed. A peak is observed in the frequency dependence of imaginary part of electric modulus (M″(ω)) at all temperatures indicating a dielectric relaxation. The complex modulus spectrum of the sample shows the poly dispersive nature of dielectric relaxation. The frequency dependence of imaginary part of electric modulus is found to obey an Arrhenius law with the activation energy of 0.95 eV. The scaling behavior of the imaginary part of electric modulus suggests that relaxation describes the same mechanism at various temperatures.