Patent ID: 7381672
Filing Date: 2008-06-03
Classification: B32B,C04B,H01G

Abstract:
1. A dielectric ceramic material comprising the composition: 100(Ba 1-x Ca x ) m TiO 3 +aMnO+bCuO+cSiO 2 +dMgO+eRO, wherein coefficients 100, a, b, c, d, and e each represent mols; m represents the molar ratio of (Ba 1-x —Ca x ) to Ti; and RO represents at least one rare-earth element oxide selected from the group consisting of Y 2 O 3 , La 2 O 3 , 2CeO 2 , Nd 2 O 3 , Sm 2 O 3 , Eu 2 O 3 , Gd 2 O 3 , Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 , Er 2 O 3 , Tm 2 O 3 , Yb 2 O 3 and Lu 2 O 3 , wherein m, x, a, b, c, d, and e satisfy the relationships: 0.998≦m≦1.030, 0≦x≦0.15, 0.01≦a≦5, 0.05≦b≦5, 0.2≦c≦8, 0.05≦d≦3.0, and 0.05≦e≦2.5, and wherein the dielectric ceramic material has an average grain size of 0.3 μm to 0.7 μm.