Liquid phase synthesis and sintering of Y3NbO7

Simon Guené-Girard (1) , Veronique Jubera (1) , Lucas Viers (2) , Rémy Boulesteix (2) , Alexandre Maitre (2) , Jean-Marc Heintz (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 IRCER-AXE4 - IRCER - Axe 4 : céramiques sous contraintes environnementales

Rare earth niobates (RE3NbO7) are materials that present interesting magnetic [[1], [2], [3]], dielectric [4,5], photocatalytic [6,7], electric or ionic conductivity [[8], [9], [10], [11], [12]] and optical properties [13,14]. Such properties could be related to the crystal structures of RE3NbO7 that exists in three different crystalline forms depending on the ionic radii of the rare earth atoms [3,[15], [16], [17], [18], [19]]. Orthorombic (Pnma) and cubic fluorite pyrochlore (Fdm) structures are found for the largest cations, while the smallest radii RE (Dy, Ho, Er, Tm, Eu, Yb …) crystallize into a defect cubic fluorite structure (Fmm) [15,17]. Rare earth and niobium atoms are statistically distributed on cationic sites, as well as oxygen vacancies on anionic sites. This relative disordered structure leads to peculiar optical properties with a significant broadening of the 4f-4f transitions observed in an Eu-doped Y3NbO7 compound...

Mots clés: Phosphate glass; Glass-ceramic; Yb3+; Luminescence; XRD; Y3NbO7; Ceramics; Sintering; Niobate; Densification; Co-precipitation; liquid route synthesis

Domaines: Matériaux; Matériaux

Simon Guené-Girard, Veronique Jubera, Lucas Viers, Rémy Boulesteix, Alexandre Maitre, et al.. Liquid phase synthesis and sintering of Y3NbO7. Ceramics International, 2020, 46 (16, Part B), pp.26361-26367. ⟨10.1016/j.ceramint.2020.02.190⟩. ⟨hal-02634762⟩