New generation of LTCC materials

To reduce the complexity of LTCC systems and so accelerate the development of LTCC tapes with new functionalities it is necessary to reduce the number of phases within a particular tape. This can best be done by using glass-free single-phase ceramic systems. Such a material system consisting of low- and high-permittivity LTCC materials was developed based on Bi eulytite (permittivity; kappa'=16) and sillenite (kappa'=40) compounds and the delta-Bi2O3 solid solution with Nb2O5 (kappa'=90). The Ge and Si analogues of the sillenites and eulytites, and the 0.75Bi(2)O(3).0.25Nb(2)O(5) solid solution meet the main requirements for LTCC with respect to their sintering behavior (T-s=850-900degreesC), their mutual chemical compatibility, their compatibility with a silver electrode as well as their dielectric properties.