Cation-deficient Ca-doping lanthanum tungstate Ca2.06La2.61□0.33W2O12: structure and transport property study

Qiong Ye (1) , Maud Barré (1) , Karim Adil (1) , A Rousseau (1) , Emmanuelle Suard (2) , F Goutenoire (1)

1 IMMM - Institut des Molécules et Matériaux du Mans
2 ILL - Institut Laue-Langevin

A new cation-deficient Ca-doping lanthanum tungstate compound with the exact formula Ca2.06La2.61□0.33W2O12 (□ indicating a vacancy) is presented in this work. It crystallizes in the space group R 3 ̅ C (No.167), Z = 18 with the hexagonal parameters a = 9.7747(1) Å and c = 55.7833(4) Å, similar to Ca5Re2O12. This compound belongs to a rare small crystallographic family A5B2X12 having large cells. The thermodynamic and kinetic processes of synthesizing this white powder compound are very slow. Its structure is analyzed by X-ray, neutron powder and electron diffraction. The conduction properties are investigated with complex impedance spectroscopy.

Mots clés: X-ray and neutron powder diffraction; Electron diffraction; Ion doping; Cation deficiency; Ionic conduction

Domaines: Chimie inorganique; Cristallographie

Qiong Ye, Maud Barré, Karim Adil, A Rousseau, Emmanuelle Suard, et al.. Cation-deficient Ca-doping lanthanum tungstate Ca2.06La2.61□0.33W2O12: structure and transport property study. Journal of Solid State Chemistry, 2022, 313, pp.123310. ⟨10.1016/j.jssc.2022.123310⟩. ⟨hal-03691614⟩