We developed multilayer ceramic capacitors (MLCCs) of the type negative-positive zero (NPO) cofired with Cu inner electrodes using novel low-loss barium niobates. The excellent dielectric properties of ceramics and compatibility between electrodes and dielectrics under a reducing atmosphere led to low loss character in the Cu-MLCCs, even in the high-frequency single-layer capacitors. We also examine the atmospheric dependence on dielectric loss of barium niobates. The origin of degradation in dielectric loss under a highly reducing atmosphere is explained by the association of two loss mechanisms: the oxygen vacancies in NbO6 octahedra and the subsequent formation of a reduced second phase: Ba3Nb 4+Nb45+O15.
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2006 Oct|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry