Cu-Doping Effect on Dielectric Properties of Organic Gel Synthesized Ba4YMn3-xCuxO11.5±δ

Tristan Barbier (1) , Cecile Autret (1) , Pascal Andreazza (2) , Antoine Ruyter (1) , Christophe Honstettre (1) , Sébastien Lambert (3) , François Gervais (1) , Marc Lethiecq (1)

1 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)
2 CRMD - Centre de Recherche sur la Matière Divisée
3 CEA Le Ripault - CEA Le Ripault

Copper doped-Ba4YMn3ÀxCuxO11.5 7 δ samples were synthesized by an organic gel assisted citrate process. X-ray diffraction of compositions with x \textonequarter0.002, 0.005, 0.01, 0.02 and 0.04 does not reveal any change of hexagonal perovskite structure on doping. The effects of Cu-doping on the microstructure and dielectric properties were investigated. Cu doping modifies the electrical properties at the level of the impedance characteristics of both grain and grain boundary and to understand these different behaviours, we have carried out high-resolution transmission electron microscopy analysis.

Mots clés: Hexagonal perovskite; Colossal permittivity; X-ray diffraction; Transmission electron microscopy; Stacking faults

Domaines: Matériaux

Tristan Barbier, Cecile Autret, Pascal Andreazza, Antoine Ruyter, Christophe Honstettre, et al.. Cu-Doping Effect on Dielectric Properties of Organic Gel Synthesized Ba4YMn3-xCuxO11.5±δ. Journal of Solid State Chemistry, 2013, 206, pp.217--225. ⟨10.1016/j.jssc.2013.08.004⟩. ⟨hal-01755975⟩