We identify ground-state collinear spin ordering in various antiferromagnetic transition metal oxides by constructing the Ising model from first-principles results and applying a genetic algorithm to find its minimum energy state. The present method can correctly reproduce the ground state of well-known antiferromagnetic oxides such as NiO, Fe2O3, Cr2O3 and MnO2. Furthermore, we identify the gr...

Cold-pressed powders of the half-metallic ferromagnet CrO2 are dielectric granular metals. Hysteretic magnetoresistance with maxima at the coercive field arises from interparticle contacts. Dilution with insulating antiferromagnetic Cr2O3 powder reduces the conductivity by 3 orders of magnitude, but enhances the magnetoresistance ratio which reaches 50% at 5K. The negative magnetoresistance is ...

A selective single phase black ?-Cr2O3 nanoparticles was bio-synthesised via simple straight-forward green synthesis approach. The process involves extraction of phytochemicals contained in peels sweet potatoes. Extraction done distilled water under constant magnetic stirring at a temperature 70–80 °C resulting dusty yellow colour aqueous extracts. Afterwards, chromic nitrate salt added to extr...

The knowledge of Cr2O3 activity in slag is necessary to decarburize chromium-containing special steel while minimizing the oxidation loss chromium. In present study, firstly, phase relationship CaO–SiO2–Cr2O3 system was determined at 1573 K. Subsequently, activities two- and three-phase coexisting slags K were measured by equilibrating molten copper with oxide phases under a stream Ar + H2 CO2 ...

The high temperature oxidation behavior of an APS processed γ–β NiCoCrAlY coating was investigated at 1150 °C. Ultrathin freestanding specimens ranging from 16 to 240 μm in thickness were tested for short-term time (< 300 h). Intrinsic chemical failure (InCF) occurred after the full consumption Al, and resulted Cr2O3 growth CrN precipitation Al2O3/alloy interface. Mass gain slowed down InCF, ev...

The lack of water is the most serious threat to humanity that leads to more efficient water and sewage treatment. Currently, many scientists are looking for new coagulants, flocculants and physicochemical methods allowing for sufficient removal of pollutants from water. The presence of various types of pigments, including chromium (III) oxide, poses the major problem. Even small amounts of thes...