Investigation of the La2O3–Nb2O5–WO3 ternary phase diagram: Isolation and crystal structure determination of the original La3NbWO10 material

T. Dan Vu (1) , Maud Barré (1) , Karim Adil (2) , Alain Jouanneaux (1) , Emmanuelle Suard (3) , François Goutenoire (1)

1 IMMM - Institut des Molécules et Matériaux du Mans
2 KAUST - King Abdullah University of Science and Technology [Saudi Arabia]
3 ILL - Institut Laue-Langevin

In the course of the exploration of the La2O3–WO3–Nb2O5 ternary phase diagram, a new compound with the formulaLa3NbWO10 was discovered. Its structure was determined from a combination of powder X-ray and neutron diffraction data. It crystallizes in the tetragonal space group P42/nmc (no.137) with the lattice parameters : a=10.0807(1)Å; c=12.5540(1)Å. The structure is built up from infinite ribbons of octahedra (W/Nb)O5 which are perpendicular to each other, lanthanum ions being distributed around these ribbons. The electrical properties of this compound were investigated on sintered pellets bymeans of complex impedance spectroscopy.

Mots clés: X-ray and neutron diffraction; Impedance spectroscopy; oxide

Domaines: Chimie; Cristallographie; Chimie inorganique; Matériaux

T. Dan Vu, Maud Barré, Karim Adil, Alain Jouanneaux, Emmanuelle Suard, et al.. Investigation of the La2O3–Nb2O5–WO3 ternary phase diagram: Isolation and crystal structure determination of the original La3NbWO10 material. Journal of Solid State Chemistry, 2015, 229, pp.129-134. ⟨10.1016/j.jssc.2015.05.022⟩. ⟨hal-02453359⟩