Studies on structural and morphological properties of multidoped ceria [Ce.sub.0.8][Nd.sub.0.0025] [Sm.sub.0.0025][Gd.sub.0.005][Dy.sub.0.095][Y.sub.0.095][O.sub.2-[delta]] as solid solutions

The nanopowdery solid solutions of multidoped ceria [Ce.sub.0.8][Nd.sub.0.0025][Sm.sub.0.0025][Gd.sub.0.005][Dy.sub.0.095][Y.sub.0.095][O.sub.2-[delta]] (x = 0.2) with the fluorite type crystal structure of Ce[O.sub.2] were synthesized for the first time. Two synthesis procedures were applied: the modified glycine-nitrate procedure (MGNP method) and room temperature self-propagating reaction (SPRT method). All nanopowders were characterized by XRPD analysis, Raman spectroscopy, low temperature nitrogen physisorption, TEM, andSEM methods. According to the XRPD and Raman spectroscopy results, single phase solid solutions of fluorite structure were evidenced regardless of the number of dopants and synthesis procedure. Both XRPD and TEM were analyses evidenced nanometer particle dimensions. The SPRT method results in obtaining sample with higher specific surface area, smaller crystallite and particles sizes, and the same values of the lattice parameter in comparison to pure Ce[O.sub.2]. Raman spectroscopy was confirmed to the oxygen vacancies introduced into the ceria lattice when [Ce.sup.4+] ions were replaced with cations (dopants) of lower valence state (3+), which may indicate the potential improvement of ionic conductivity. Additionally, the presence of oxygen vacancies in the lattice ceria, as well as very developed grain boundaries, gives a new possibility for potential application of obtained nanopowders in the area of room temperature ferromagnetism as spintronics.