| abstract |
A ceramic base material that is reduced in distortion caused by high-temperature heat treatment. A ceramic base material having sintering agents and satisfying the following formula: n n a/b≦1.3, n where a: the larger of c 1 and c 2, b: the smaller of c 1 and c 2, c 1: the ratio “k” at a main-surface side, c 2: the ratio “k” at the other main-surface side, n n k=s/m, ns: the fluorescent X-ray-detected strength of the constituent elements of the sintering agents, m: the fluorescent X-ray-detected strength of the main-constituent elements. |