UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO₂-Y₆WO₁₂

François Cheviré (1) , Francisco Muñoz (1) , Charles F. Baker (1) , Franck Tessier (1) , Olivier Larcher (1) , Souhir Boujday (2) , Christophe Colbeau-Justin (2) , Roger Marchand (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 LIMHP - Laboratoire d'Ingénierie des Matériaux et des Hautes Pressions

A new fluorite-type solid solution domain has been evidenced in the system (1−x) CeO₂ − x/7 Y₆WO₁₂□₂ using the amorphous citrate route. All the studied phases (0 ⩽ x ⩽ 1) crystallize in a cubic-type symmetry. Diffuse reflectance spectra reveal a strong optical absorption between 380 and 400 nm. All substituted compositions spectral selectivities are estimated suitable for application as inorganic UV absorbers. The non linear variation observed in the optical gap values between Y₆WO₁₂ and CeO₂ is attributed to the presence of the cerium 4f-block band. Additionally, Time Resolved Microwave Conductivity (TRMC) experiment and phenol photodegradation analyses carried out on the Ce_0.81Y_0.16W_0.03O_1.95□_0.05 (x=0.19) composition do not indicate any photocalatytic activity for this material.

Mots clés: Modified ceria; Solid solution; Amorphous citrate route; Optical properties; UV absorbers

Domaines: Matériaux

François Cheviré, Francisco Muñoz, Charles F. Baker, Franck Tessier, Olivier Larcher, et al.. UV absorption properties of ceria-modified compositions within the fluorite-type solid solution CeO₂-Y₆WO₁₂. Journal of Solid State Chemistry, 2006, 179 (10), pp.3184-3190. ⟨10.1016/j.jssc.2006.06.013⟩. ⟨hal-00868037⟩