Long range magnetic ordering in rocksalt high entropy oxides

We report the magnetic properties of Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O, a high entropy oxide with a rocksalt structure, and the influence of substitutions on these properties. From the magnetic susceptibility and neutron diffraction measurements, we found that this compound exhibits long range magnetic order below 120 amp; 8201;K despite the substantial structural disorder. Other rocksalt type high entropy oxides with various chemical substitutions were found to host either an antiferromagnetic order or spin glass state depending on the amount of magnetic ions. The presence of magnetic order for such a disordered material potentially provides a route to explore exotic magnetic properties and function

Micro- and nanopyramids of Manganese-Doped Indium Oxide

Mn-doped In(2)O(3) nanopyramids have been grown by a catalyst-free thermal process at 700 degrees C using InN and Mn(2)O(3) powders as precursors. Energy dispersive spectroscopy, as well as X-ray photoelectron spectroscopy, demonstrate the presence of Mn in the pyramids in a content below 1 at. %. In addition to pyramids, nanowires with diameters of about 100 nm grow during treatments at 800 degrees C. Luminescence has been studied by cathodoluminescence in the scanning electron microscope, showing emissions at 1.9, 2.65, and 3.3 eV. Dopant incorporation into the nanostructures and their oxidation states, as well as the effect on the electronic structure, have been measured and discussed