A series of chromium oxides (Cr2O3) nanoparticles supported on different carbonaceous material, namely: graphene, graphene oxide (GO) and graphite, were synthetized by precipitation the salt precursors with precipitant (ammonia) subsequent thermal treatment. The catalytic activity these composites Cr2O3 have been analysed Koutecky-Levich (KL) rotating ring-disc electrode methods results discuss...

Abstract: Electroless Nickel (EN) composite coatings embedded with Cr2O3 and/or MoS2 particles were deposited to combine the characters of both Cr2O3 and MoS2 into one coating in this study. The effects of the co-deposited particles on corrosion behavior of the coating in 3.5% NaCl media were investigated. The results showed that both Ni-P and Ni-P composite coatings had significant improvement...

We develop a microscopic model that explains non-reciprocal optical effects in centrosymmetric Cr2O3. It is shown that light can couple directly to the antiferromagnetic order parameter. This coupling is mediated by the spinorbit interaction and involves an interplay between the breaking of inversion symmetry due to the antiferromagnetic order parameter and the trigonal field contribution to th...

Magnetotransport properties of granular CrO2 /Cr2O3 films made of CrO2 crystals covered by 12 nm native insulating Cr2O3 are presented. Electrical properties of a limited number of grains measured in series and parallel (10 to 15 grains) reveal intergrain tunneling characteristics. At lowest temperatures, a well pronounced zero bias anomaly indicates that impurities in the junctions block the e...

We report directly grown strongly adherent graphene on Co3O4(111) by carbon molecular beam epitaxy (C MBE) at 850 K and density functional theory (DFT) findings that the first graphene layer is reconstructed to fit the Co3O4 surface, while subsequent layers retain normal graphene structure. This adherence to the Co3O4 structure results from partial bonding of half the carbons to top oxygens of ...

Chromia (Cr2O3) nanoparticles have been successfully synthesized via the facile solvothermal process, by using CrO3 in butanol and propanol as solvents. The functional groups of the samples were tested by the Fourier Transform Infrared (FTIR) spectroscopy. The as-synthesized nanoparticle sizes are calculated and confirmed to be 34 and 40 nm, by using X-ray Diffraction (XRD) and Transmission Ele...

The plasma spray process was used to form 70%NiCrAlY + 30%TiO2 and 25%Cr2O3 5%YSZ cermet coatings on MDN-420 special steel alloy . Cyclic oxidation testing conducted coated uncoated specimens at 700°C under a static air environment. Thermogravimetric analysis applied establish the kinetics. X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy-dispersive x-ray spectroscopy (EDS), p...

In the present paper, different concentrations of chromium oxide (Cr2O3) nanoparticles (? 0.6 wt%) were incorporated within PEO/CMC polymer blend to produce nanocomposite films using casting technique. X-ray diffraction was performed on PEO/CMC-Cr2O3 nanocomposites. The main peaks Cr2O3 observed and defined as cubic structure orthorhombic shape. average particle size calculated by Scherer’s equ...

increasing demands for cement, iron and steel industries for refractories with suitable workability in severeconditions (without any environmental risks), make the refractories’ researches to be an active area. refractories containing spinel has been developed with addition of chromia as a substitute in refractories using magnesite - chromite. in this research, different amounts of cr2o3 were a...