Crystal structures and luminescence properties of La3Zr4F25 and alpha-LaZr3F15

Nenhuma Miniatura disponível
Dexpert-Ghys, J.
Ribeiro, SJL
Dugat, P.
Avignant, D.
Título da Revista
ISSN da Revista
Título de Volume
Royal Soc Chemistry
During a study of the LaF3-ZrF4 system, both La3Zr4F25 and alpha-LaZr3F15 compounds have been evidenced. Their crystal structures have been determined from single-crystal X-ray diffraction data. La3Zr4F25 crystallises in the cubic system with a= 12.384 Angstrom and I (4) over bar 3d space group (no. 220). Its crystal structure is built up of (ZrF6)(2-) octahedra and (LaF8)(5-) dodecahedra sharing corners. The low temperature form, alpha, of LaZr3F15 is orthorhombic (space group Pmmn, no. 59) with a = 15.721 Angstrom, b = 16.299 Angstrom, c= 8.438 Angstrom. Its structure is built of corner-sharing tricaped trigonal prisms surrounding the La3+ ions and both octahedra and monocapped trigonal prisms encompassing the Zr4+ ions. This structure is characterised by dynamically disordered (ZrF6)(2-) complex anions.The Eu3+ luminescence properties of these phases have been investigated and are discussed in relationship with their crystal structures.
Como citar
Journal of Materials Chemistry. Cambridge: Royal Soc Chemistry, v. 8, n. 4, p. 1043-1050, 1998.