|About this Abstract
||Materials Science & Technology 2012
||Advances in Dielectric Materials and Electronic Devices
||Low Temperature Fired Ca-Cu Titanate Multilayers
||Jörg Töpfer, Romy Löhnert, Steffen Römhild, Beate Capraro, Heike Bartsch
|On-Site Speaker (Planned)
CaCu3Ti4O12 (CCTO) has attracted attention because of its large effective permittivity and its weak temperature and frequency dependence. Hence CCTO is a promising candidate for passive components integrated in LTCC modules, e.g. for LC filters. We explore the potential of CCTO for low temperature firing and report on the sintering behavior, microstructure formation and dielectric properties of samples sintered at high and low temperature conditions, respectively. Sintering at 1100°C leads to an inhomogeneous microstructure characterized by significant grain growth, formation of a Cu-rich grain boundary phase and a large effective permittivity of K = 30.000. With the addition of 1% BBSZ glass as liquid-phase sintering aid CCTO was fired at 900°C. We observed moderate grain growth and a permittivity of 600. Monolithic multilayer capacitors were fabricated by cofiring CCTO tapes at 900°C. First results on the integration of CCTO multilayers in LTCC modules will be reported.