| abstract |
To provide a ceramic composition not only having little compositional variation after burning, but a high flexural strength of the sintered body, and a high Q value in a microwave band, a ceramic composition used for forming a ceramic layer of a multi-layer ceramic substrate contains 47.0 to 67.0 wt. % of SiO 2 , 21.0 to 41.0 wt. % of BaO, and 10.0 to 18.0 wt. % of Al 2 O 3 , and contains as a first additive, 1.0 to 5.0 parts by weight of CeO 2 , relative to a total of 100 parts of SiO 2 , BaO and Al 2 O 3 , and as a second additive, 2.5 to 5.5 parts by weight of MnO, relative to a total of 100 parts by weight of SiO 2 , BaO, Al 2 O 3 and CeO 2 , and is substantially free of Cr. As a third additive, at least one of Zr, Ti, Zn, Nb, Mg and Fe, and as a fourth additive, a Co component and/or a V component, may be contained. |