| 摘要 |
PROBLEM TO BE SOLVED: To obtain ceramics composition bakable at 800-1000 deg.C, having high relative dielectric constant and low dielectric loss tangent even in a high-frequency region of >=1GHz and exhibiting high strength and provide a process for the production of the ceramics composition. SOLUTION: This ceramics composition is composed of 10-40wt.% of a crystallized glass containing at least B2 O3 , SiO2 , Al2 O3 and ZnO, 5-70wt.% of SrTiO3 and 1-70wt.% of Al2 O3 . A powdery mixture of the above composition is formed and baked in a non-oxidizing atmosphere at 800-1000 deg.C to obtain ceramics containing a perovskite-type crystal phase containing at least Sr and Ti, a spinel-type crystal phase containing at least Zn and Al, a rutile-type crystal phase and an Al2 O3 crystal phase as the constituent crystal phases and having a dielectric constant of >=10 and a transverse rupture strength of >=20kg/mm<2> . |
