Low-losses, highly tunable Ba0.6Sr0.4TiO3/MgO composite

U-Chan Chung (1) , Catherine Elissalde (1) , Mario Maglione (1) , Claude Estournès (2) , M. Paté (3) , Jean-Pierre Ganne (3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 Thales Research and Technology [Palaiseau]

Spark plasma sintering SPS is an efficient tool to obtain highly densified ferroelectric-dielectric ceramic composites with clean interfaces and tunable properties. Dielectric MgO and ferroelectric Ba0.6Sr0.4TiO3 BST were combined in two-dimensional multilayer and three-dimensional random powders design. Their unmodified BST Curie temperature proves the suppression of interdiffusion while dielectric losses are below 0.5% and the tunability is 40% at room temperature. The composites and pure BST with similar densities 95% were obtained, owing reliable comparison of their dielectric properties. Such SPS ceramics can be used as experimental input for simulation and are potential candidates for high frequency applications.

Mots clés: Composite; Dielectric loss and relaxation; Ferroelectricity; Ceramic; Spark plasma sintering; SPS

Domaines: Matériaux

U-Chan Chung, Catherine Elissalde, Mario Maglione, Claude Estournès, M. Paté, et al.. Low-losses, highly tunable Ba0.6Sr0.4TiO3/MgO composite. Applied Physics Letters, 2008, 92 (4), 042902 (3 p.). ⟨10.1063/1.2837621⟩. ⟨hal-00258625⟩