CoxMg1-xFe2O4 (where x was 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spinel ferrites were synthesized by the sol-gel combustion method using citric acid as fuel, following rules of propellant chemistry. Amorphous powders then calcined at 700 °C for 3 h. Structural analysis X-Ray diffraction (XRD), FTIR Raman spectroscopy confirmed formation a cubic structure where cation distribution inversion degree...

Advances in aqueous potassium-ion batteries (APIBs) are hindered by the lack of cathode materials with fast K+ transport kinetics and stable structure during intercalation/deintercalation. Herein, a birnessite/spinel Mn3O4 heterostructure...

Rechargeable metal-air batteries are considered a promising energy storage solution owing to their high theoretical energy density. The major obstacles to realising this technology include the slow kinetics of oxygen reduction and evolution on the cathode (air electrode) upon battery discharging and charging, respectively. Here, we report non-precious metal oxide catalysts based on spinel-type ...

Density functional theory (DFT) calculations have been performed on A(2+)B2(3+)O4(2-) (where A(2+) = Fe, Ni or Zn, and B(3+) = Fe or Cr) spinel oxides in order to determine some of their thermodynamic properties. Mixing energies were calculated for Fe3O4-NiFe2O4, Fe3O4-ZnFe2O4, Fe3O4-FeCr2O4, NiFe2O4-ZnFe2O4, NiFe2O4-NiCr2O4, FeCr2O4-NiCr2O4, FeCr2O4-ZnCr2O4 and ZnCr2O4-ZnFe2O4 pseudo-binaries ...

We present here a first principles study of the structural, electronic, magnetic, and hyperfine properties magnesium ferrite, MgFe2O4 (spinel structure). The was carried out within framework Functional Density Theory (DFT) using full potential linearized augmented plane waves method (FPLAPW) both Generalized Gradient (GGA) GGA+U approximations for exchange correlation potential. To discuss magn...

Magnesium aluminate has the spinel structure along with good mechanical, chemical, and thermal properties. a wide range of applications including refractory ceramics, optically transparent ceramic windows, armors. Its low dielectric permeability loss tangent enable its for integrated electronic devices, as well. In this paper, MgO Al2O3 powders were mixed in one-to-one molar ratio calcined at t...

cobalt chromite (cocr2o4) with normal spinel structure, shows catalytic activity for oxidation of unburned methane in the natural gas vehilcles (ngv). in this study, cocr2o4 nanoparticles were synthesized through a conventional co-precipitation technique and investigated for the catalytic combustion of methane. cobalt nitrate hexahydrate, chromium nitrate nonahydrate and ammonia solution (25%) ...