Dielectric relaxation behaviour of Sr 2 SbMnO 6 ceramics fabricated from nanocrystalline powders prepared by molten salt synthesis

Abstract

Double perovskite polycrystalline single phase and dense Sr 2 SbMnO 6 (SSM) ceramics, fabricated using the nanocrystalline powders synthesized by molten salt method, exhibited high dielectric constant with low dielectric loss as compared to that of SSM ceramics obtained from the powders prepared by solid-state synthesis method. The dielectric data obtained over a wide frequency (100 Hz-1 MHz) and temperature (190 K-300 K) ranges exhibited distinct relaxations owing to both the grain and grain boundary. The dielectric dispersion was modeled using the Cole-Cole equation consisting of two separate relaxation terms corresponding to the grain and grain boundary. The grain and grain boundary relaxations observed in the Nyquist plots (Z and Z ) were modeled by an equivalent circuit consisting of two parallel RC circuits connected in series with each other. A careful analysis of both the impedance (Z vs ω ω ω) and modulus (M vs ω ω ω) behaviour corroborated the conclusions drawn from the dielectric data.

Complex Dielectric and Impedance Spectroscopic Studies in a Multiferroic Composite of Bi2Fe4O9-BiFeO3

“…As can be seen from Table 2, the activation energy and correspondingly the time required for dielectric relaxation is higher for oxygen vacancy defects and thus the hopping from Fe 2+ /Fe 3+ . While the dielectric relaxation time for the composite is 10 times higher as compared to single phase Bi2Fe4O9, implying that the composite shows better capacitive effect and hence charge storage effects [27].…”

Theoretical study of structural stability and electronic properties of Sr2MnSbO6 perovskite

“…The Sr 2 MnSbO 6 perovskite is one compound of this type, and it has been synthetized via molten salt synthesis (MSS) method and convectional solid-state methods for example by (Cheah et al, 2006;Ivanov et al, 2009;Parada et al, 2018;Preethi-Meher et al, 2012). Experimental studies of Sr 2 MnSbO 6 have shown that this compound presents ferroelectric and ferromagnetic behavior in the I4m, I4mm, I4mcm phases, as well as it exhibits high dielectric constant in the cubic phase Fm-3m (Antara, et al, 2011;Foster, et al,1997;Majhi & Varma, 2007). Modifications of this compound recently have been reported by (Bazuev et al, 2021), where is studied the effect of substitutions on the phase formation, structure and magnetic properties of the Sr 2 MnSbO 6 compound.…”

High temperature dielectric relaxation anomalies in Ca0.9Nd0.1Ti0.9Al0.1O3−δsingle crystals

“…10. 26 The equivalent circuit was tted by using EIS spectra analyser 1.0. 27 Due to the electrode polarization effect, we could not observe a full semi circular arc for all the temperatures.…”