Mercedes Gracia

TL;DR: The bulk structural properties of the nickel cobaltite, NiCo2O4, prepared by the thermal decomposition of carbonates, sol-gel methods, and the decomposition of hydroxides, have been examined by X-ray powder diffraction (XRD) and Xray absorption spectroscopy (EXAFS and XANES) as discussed by the authors.

TL;DR: In this paper, the properties of the compound NiCo2O4 with spinel-related structure have been examined by means of magnetic measurements, neutron diffraction, X-ray absorption near edge structure (XANES) and extended Xray absorption fine structure (EXAFS), and the results suggest a delocalised electron distribution on the octahedral sites with average oxidation states of +3.5 and +2.5 for nickel and cobalt, respectively, and lead to a cation distribution for NiCo 2O4 of {Ni3+0.

TL;DR: In this article, the binding energies of the photoelectron peaks observed for the transition metal ions and the oxygenated ions were recorded, indicating that cobalt is present in both divalent and trivalent states.

TL;DR: In this article, two series of Fe−Ce catalysts were prepared following two different methods: coprecipitation from Fe and Ce nitrate solutions and physical mixing of pure Fe precursors.

TL;DR: In this paper, two different types of ancient bricks (12th to 14th centuries) collected from historical buildings of Toledo (Spain) were characterised by optical microscopy, scanning electron microscopy/energy-dispersive X-ray spectrometers (SEM/EDS), electron probe microanalysis (EM), XRD, differential thermal analysis (DTA) and 57Fe-Mossbauer spectroscopy.