| 摘要 |
The low thermal expansion and high rigidity ceramic sintered body of this invention is characterized by assuming as a crystal structure a hexagonal close-packed structure and substantially comprising solid solution crystal grains represented by the formula: MgaLibFecAldSieOf (wherein a is in the range of 1.8 to 1.9, b is in the range of 0.1 to 0.3, c is in the range of 0 to 0.2, d is in the range of 3.9 to 4.1, e is in the range of 6.0 to 7.0, and f is in the range of 19 to 23). It is further characterized by the solid solution crystal grains having lattice constants in the ranges, a0 in the range of 9.774 to 9.804 Å and c0 in the range of 9.286 to 9.330 Å, the relative density of the sintered body being of not less than 98%.
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