| 摘要 |
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: <?in-line-formulae description="In-line Formulae" end="lead"?>a/b<=1.3,<?in-line-formulae description="In-line Formulae" end="tail"?> where a: the larger of c1 and c2, b: the smaller of c1 and c2, c1: the ratio "k" at a main-surface side, c2: the ratio "k" at the other main-surface side, k=s/m, s: 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.
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