The rare earth-based double perovskites have been widely studied due to their exceptional physical properties and wide range of technological applications. Despite the extensive investigation of copper-based rare earth double perovskites and a limited study of samarium-based double perovskites, no reports on the synthesis and characterization of Sm2FeCuO6 have been found in the literature. This work presents the experimental investigation on the synthesis of Sm2FeCuO6 via a wet chemical sol-gel route and the characterization of its structural and electrochemical properties using various techniques. The results showed that Sm2FeCuO6 have good electrochemical properties, making it a promising candidate for use in electrochemical energy storage applications.
Citric acid and ethylene glycol assisted hydrothermal synthesis of pure-phase double perovskite oxide Y 2 FeCoO 6 is reported. The Rietveld refinement confirm the orthorhombic phase formation with Pnma space group symmetry and lattice parameters as, a ¼ 5.5039 Å, b ¼ 7.4734 Å, and c ¼ 5.2094 Å. The high-resolution transmission electron micrographs exhibit formation of flakes, composed of agglomerated crystallites, oriented in [121] direction. The oxidation states of Fe as Fe 3þ and Co as Co 2þ /Co 3þ are observed by X-ray photoelectron spectroscopy. The room temperature relative permittivity, 6.8 Â 10 4 , is found to increase to 1.3 Â 10 7 at 473 K and frequency 500 Hz. The specific capacitance of %31.32 F g À1 is obtained at the current density of 1 A g À1. The effective charge storage involve the redox reactions of Fe 2þ /Fe 3þ , Co 2þ /Co 3þ , and Co 3þ /Co 4þ , and excellent capacitance retention of %99% is achieved after 5000 charging/ discharging cycles at current density of 6 A g À1 .
In this paper general expression of reliability has been derived for time dependent stress strength model if stress is random independent and strength is random fixed for the following cases. (i).Stress follow Pareto distribution and strength follow finite mixture of exponential distribution. (ii).Stress follow exponential distribution and strength follow finite mixture of Pareto distribution.
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