Title :
High dielectric constant in CaCu3Ti4O12 multiphased ceramics
Author :
Lebey, Th ; Guillemet, S. ; Bley, V. ; Boulos, M. ; Durand, B.
Author_Institution :
Lab. de Genie Electrique de Toulouse, CNRS, Toulouse, France
Abstract :
Different CCT powders containing several phases, CaCu3Ti4O12 (major phase), CaTiO3 and CuO are elaborated by a "soft chemistry" method. Three main types of sintered ceramics are realized: a monophased consisting of the pure CCT phase, a biphased (CCT + CaTiO3), and a three-phased (CCT + CaTiO3 + copper oxide (CuO or Cu2O)). All of them present original dielectric properties. Values up to 8 × 105 at 1 kHz are obtained for the relative permittivity with relatively low losses. The origin of such huge permittivity values and the influence of the structure (presence of additional phases) on the dielectric properties of the ceramics are discussed.
Keywords :
calcium compounds; ceramics; copper compounds; permittivity; powders; sintering; titanium compounds; 1 kHz; CaCu3Ti4O12; dielectric constant; dielectric properties; multiphased ceramics; powders; relative permittivity; sintered ceramics; soft chemistry method; Ceramics; Chemical analysis; Conducting materials; Copper; Dielectric materials; High-K gate dielectrics; Permittivity; Powders; Scanning electron microscopy; X-ray diffraction;
Conference_Titel :
Electrical Insulating Materials, 2005. (ISEIM 2005). Proceedings of 2005 International Symposium on
Print_ISBN :
4-88686-063-X
DOI :
10.1109/ISEIM.2005.193490
