Metal-oxygen bonding of the Ce-doped LaCoO3 system remains largely unexplored despite extensive studies on its magnetic properties. Here, we investigate structure and local nanoscale La1−xCexCoO3, with x = 0, 0.2, 0.4, using Rietveld refinement synchrotron X-ray absorption techniques, complemented by topological analysis experimental electron density energy distribution. The results show that s...

Improving the potential of promising CeO2-based nanocatalysts in practical applications requires an atomic-scale analysis effects active dopants on distribution Ce valence states and formation oxygen vacancies (VOs). In this study, a Cr dopant is introduced into cubic {100}-faceted CeO2 nanocrystals (NCs) with average size 7.8 nm via supercritical water. The substitute sites amount approximatel...

a new polyvinyl choloride (pvc) membrane sensor for cerium (iii) was prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane (kryptofix22dd) as an ionophore. the sensor exhibites a linear concentration range of 1.0×10-6to 1.0×10-1m, with a nernstian slope of 18.0±1.0 mv/decade, and a detection limit of 9.7×10-7m. it has a fast response time (5 s) and can be used for two mont...

During recent development, it has been demonstrated that cerium oxide nanoparticles (CNPs) have exhibited catalytic activity which mimics naturally existing enzymes such as superoxide dismutase (SOD) and catalase. The underlying mechanism is attributed to the modulation of oxygen vacancies on CNPs lattice by dynamic switching of the oxidation states between Ce3+ and Ce4+ due to the electron tra...

in this paper we propose and simulate a new heterostructure mesfet, called δ-doped ldd hmesfet. to improve carrier velocity in vicinity of the source in channel of gaas mesfet, one can replace source with alxga 1-x as. by increasing al content, discontinuity of hetero-interface could be increased. therefore, the velocity increases in the low field. however, increasing al mole fraction in excess...