A double perovskite BaCaZrMnO6: synthesis, microstructural dielectric, transport and optical properties
Department of Physics, ITER, Siksha O Anusandhan Deemed to be University, Bhubaneswar 751030, India
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Received in final form: 29 November 2022
Accepted: 20 December 2022
Published online: 25 January 2023
In this communication, synthesis (solid-state reaction) and characterization of a double perovskite BaCaZrMnO6 are reported. The Williamson–Hall method is used to compute average crystallite and micro-lattice strain in the prepared sample after structural analysis with X-Pert High-Score software. The sample's microstructural characteristics were investigated using a scanning electron microscope (SEM), and compositional purity was determined using energy dispersive x-ray spectroscopy (EDX). The Raman spectrum displays all atomic modes of vibration, providing information on phase, polymorphic crystallinity, and molecular interaction, as well as confirming the presence of all constituent elements. The ultraviolet visible spectrum research gives good bandgap energy for several optoelectronic devices. The impedance parameters have been measured using an impedance analyzer in a wide range of frequencies (102–106 Hz) and temperatures from 25 °C to 500 °C. The dielectric versus temperature and frequency analysis validates the Maxwell–Wanger type of dielectric dispersion. The impedance spectroscopy investigation indicates that the sample exhibits a negative temperature coefficient of resistance (NTCR), whereas the modulus analysis verifies a non-Debye type of relaxation process. The results of the ac conductivity research confirm a thermally activated relaxation process. Nyquist plot analysis reveals the NTCR character, which is well supported by Cole–Cole plots. The resistance versus temperature analysis supports the NTC thermistor nature, but the polarization–electric field (P–E) loop analysis reveals the presence of ferroelectric character, making it a strong option for temperature sensors and ferroelectric-related devices.
© EDP Sciences, 2023