Low-losses, highly tunable Ba 0.6 Sr 0.4 Ti O 3 ∕ Mg O composite

• Published in: Applied physics letters Vol. 92; no. 4; pp. 042902 - 042902-3
• Main Authors: Chung, U.-Chan, Elissalde, C., Maglione, M., Estournès, C., Paté, M., Ganne, J. P.
• Format: Journal Article
• Published: American Institute of Physics 29-01-2008
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.2837621

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
Ba
0.6
Sr
0.4
Ti
O
3
(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.