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Structural, Dielectric, and Energy Storage Properties of Citric Acid and Ethylene Glycol Assisted Hydrothermally Synthesized Y 2 FeCoO 6
Author(s) -
Devi Manju,
Kumar Ashavani,
Kumar Ashok
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000324
Subject(s) - orthorhombic crystal system , crystallite , materials science , ethylene glycol , dielectric , x ray photoelectron spectroscopy , citric acid , phase (matter) , rietveld refinement , analytical chemistry (journal) , crystallography , chemistry , crystal structure , chemical engineering , optoelectronics , organic chemistry , engineering , chromatography
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 = 5.5039 Å, b = 7.4734 Å, and c = 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 3+ and Co as Co 2+ /Co 3+ are observed by X‐ray photoelectron spectroscopy. The room temperature relative permittivity, 6.8 × 10 4 , is found to increase to 1.3 × 10 7 at 473 K and frequency 500 Hz. The specific capacitance of ≈31.32 F g −1 is obtained at the current density of 1 A g −1 . The effective charge storage involve the redox reactions of Fe 2+ /Fe 3+ , Co 2+ /Co 3+ , and Co 3+ /Co 4+ , and excellent capacitance retention of ≈99% is achieved after 5000 charging/discharging cycles at current density of 6 A g −1 .