Magnesium salts and oxide: An XPS overview

XPS measurements have been performed on a series of MgII salts (NO-3, CO2-3, SO2-4, CI-, CH3COO-), hydroxides and oxides, these latter compounds are both commercial and prepared in laboratory. The binding energy (BE) of the anionic partner in MgII salts compares well in any case with literature data for the same anions in other alkaline and alkaline earth compounds. The BE of MgII appears to be affected by the electroattractive nature of the parent anion. The MgII spectra, in the case of MgO samples, are not influenced either by the nature of the oxide precursor salt or by the temperature of the oxide preparation (873 K, 1073 K, 1253 K). The BE of Mg 2p ranges between 49.9 eV and 50.2 eV. Oxygen spectra are regular and show the presence of the surface chemisorbed -OH component even at heating temperatures of 1473 K. The choice, as internal reference, of the hydrocarbon contaminant carbon peak is discussed, specifically, in the case of MgO samples with reference to specific lattice and surface properties of the oxide itself. \ua9 1997 Elsevier Science B.V

Synthesis of spherical nanoparticles of Cu2L2O5 (L = Ho, Er) from W/O microemulsions

Nanoparticles of Cu2L2O, (L = Ho, Er) (15-25 nm in size) were synthesised by the intermediate use of W/O microemulsions. In this process the aqueous cores of water/cetyltrimethylammonium bromide/n-octane/1-butanol microemulsions were used as microreactors for the precipitation of Cu2Ho2(CO3)(4)(OH)(2) (25-30 nm) and Cu2Er2(CO3)(4)(OH)(2) (10-40 nm) as precursors. These mixed salts were separated and further decomposed to the corresponding mixed oxides at 900 degrees C for 16 h. All solids were characterised by scanning and transmission electron microscopy, IR, XRPD, ICP-OES, TCA, XPS measurements and elemental analyses