Ftir and Raman Spectroscopic Study of a Complex Perovskite: Ca_0.91-XCe_0.09Rb_0.04Cs_x[(Zr_0.50Ti_0.45)Al_0.05]O₃, X=0.2 to 0.4, Dedicated for Radioactive Waste Confinement

Abstract

<jats:title>Abstract</jats:title><jats:p>Perovskite is able to sequester simultaneously, in its structure, both actinides and alkaline-earth elements. This study is an attempt to synthesize a complex perovskite Ca<jats:sub>0.91-x</jats:sub>Ce<jats:sub>0.09</jats:sub>Rb<jats:sub>0.04</jats:sub>Cs<jats:sub>x</jats:sub>[(Zr<jats:sub>0.50</jats:sub>Ti<jats:sub>0.45</jats:sub>)Al<jats:sub>0.05</jats:sub>]O<jats:sub>3</jats:sub> (0.2≤x≤0.4), doped in the same time, with Ce, Cs and Rb. The synthesis is conducted by sintering at 1150°C during 16h. XRX analysis confirms the perovskite formation. SEM observations show a less porous microstructure. FTIR analysis reveals TiO<jats:sub>6</jats:sub>, Ti-O-Ti, Ti-O and Zr-O vibrations. Raman spectroscopy indicates many orthorhombic perovskite active modes, as: Ti-O<jats:sub>6</jats:sub> and Ti-O<jats:sub>3</jats:sub> torsions, ZrO<jats:sub>7</jats:sub>, CaO<jats:sub>8</jats:sub> vibrations, the totally symmetric oxygen, and the O-octahedron cage rotation.</jats:p>