Controlling internal barrier in low loss BaTiO₃ supercapacitors

U-Chan Chung Seu (1) , Catherine Elissalde (1) , Stéphane Mornet (1) , Mario Maglione (1) , Claude Estournès (2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Supercapacitor behavior has been reported in a number of oxides including reduced BaTiO₃ ferroelectric ceramics. These so-called giant properties are however not easily controlled. We show here that the continuous coating of individual BaTiO₃ grains by a silica shell in combination with spark plasma sintering is a way to process bulk composites having supercapacitor features with low dielectric losses and temperature stability. The silica shell acts both as an oxidation barrier during the processing and as a dielectric barrier in the final composite.

Mots clés: Low loss; BaTiO3; Supercapacitors

Domaines: Matériaux

U-Chan Chung Seu, Catherine Elissalde, Stéphane Mornet, Mario Maglione, Claude Estournès. Controlling internal barrier in low loss BaTiO₃ supercapacitors. Applied Physics Letters, 2009, 94 (7), 072903 (3 p.). ⟨10.1063/1.3076125⟩. ⟨hal-00369121⟩