Structural Study of Rare Earth Oxides Doped by Barium

Two series of samples noted LnBaX (where Ln = Nd or Sm, X = at. % of Ba) were dispersed in an excess of bi-distilled and demineralised water during 16 h at 80° from Ln2O3 and γ-BaCO3. These samples were calcined under air at 450 and 1150 °C then characterized by X-ray diffraction, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy. After calcination at 450 °C, XRD and XPS measurement shows the presence of Ln2O3, barium carbonates, oxy-carbonates and oxy-hydroxides LnO(OH) in LnBaX. At 1150 °C, results shows that NdBaX and SmBaX are formed by the BaO and Ln2O3. However neodymium and samarium oxides do not incorporate barium.