1. Department of Chemistry, University of Burgos, 09001 Burgos, Spain
2. National Scientific and Technical Research Council (CONICET), Bariloche Atomic Centre (CNEA), R8402AGP, S. C. de Bariloche, Río Negro, Argentina
3. Department of Chemical and Paper Engineering, Western Michigan University, Kalamazoo, MI 49008-5462, USA
4. Department of Physics, University of Burgos, 09001 Burgos, Spain
5. International Research Center in Critical Raw Materials for Advanced Industrial Technologies (ICCRAM), University of Burgos, 09001 Burgos, Spain