Alumina ceramic composition

摘要

An alumina ceramic composition to provide a low dielectric loss in the high frequency region upon sintering, which consists essentially of: 100 parts by weight of a base composition containing therein Al2O3, CaO and TiO2 within their respective compositional range; and 0.03 to 3 parts by weight of La2O3. The base composition is within a range A-B-C-D-E-A in the ternary diagram (Figure) in molar fraction: -Al2O3 CaO TiO2 -A 99.0 0.5 0.5 -B 94.5 3.7 1.8 -C 90.0 7.0 3.0 -D 90.0 2.0 8.0 -E 94.5 1.3 4.2 -