The NaCu0.2Fe0.3Mn0.5O2 compound was synthesized using a solid-state reaction. The precursors, of Na2CO3 (99%), CuO (99%), Fe2O3 (99%) and Mn2O3 (99%) were obtained from Sigma-Aldrich, and were mixed in proportional ratios. The obtained powder was burned at 500 °C for 16 h, and then, the sample was ground, pressed into pellets and transferred to an oven at 850 °C for 24 h.
To determine the purity of the sample, powder XRD was performed using a Bruker D8 Discover with Twin/Twin optics, at room temperature, with Cu Kα radiation (λ = 1.5406 Å, 10° ≤ 2θ ≤ 80°). To precisely determine the optical properties of the prepared sample, a Shimadzu UV-3101 PC scanning spectrophotometer was used at room temperature, with a wavelength range of 200–800 nm, with a sample pellet of 0.5 mm of diameter. Finally, the electrical property measurements were obtained using complex impedance spectroscopy with a Solartron SI 1260 impedance/gain phase analyzer in the temperature and frequency ranges of 333–453 K and 10−1 to 106 Hz, respectively, with a sample pellet with a thickness of 1 mm and a diameter of 8 mm.
To determine the purity of the sample, powder XRD was performed using a Bruker D8 Discover with Twin/Twin optics, at room temperature, with Cu Kα radiation (λ = 1.5406 Å, 10° ≤ 2θ ≤ 80°). To precisely determine the optical properties of the prepared sample, a Shimadzu UV-3101 PC scanning spectrophotometer was used at room temperature, with a wavelength range of 200–800 nm, with a sample pellet of 0.5 mm of diameter. Finally, the electrical property measurements were obtained using complex impedance spectroscopy with a Solartron SI 1260 impedance/gain phase analyzer in the temperature and frequency ranges of 333–453 K and 10−1 to 106 Hz, respectively, with a sample pellet with a thickness of 1 mm and a diameter of 8 mm.