| US 7,580,242 B2 | ||
| Dielectric ceramic composition and electronic device | ||
| Sanshiro Aman, Narita (Japan); Takashi Kojima, Narita (Japan); Mari Miyauchi, Narita (Japan); Masakazu Hosono, Narita (Japan); Dan Sakurai, Yurihonjo (Japan); Kosuke Takano, Narita (Japan); and Nobuto Morigasaki, Narita (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Filed on Feb. 21, 2008, as Appl. No. 12/71,470. | ||
| Claims priority of application No. 2007-105189 (JP), filed on Apr. 12, 2007; and application No. 2007-255591 (JP), filed on Sep. 28, 2007. | ||
| Prior Publication US 2008/0297979 A1, Dec. 04, 2008 | ||
| Int. Cl. H01G 4/06 (2006.01) | ||
| U.S. Cl. 361—321.5 [361/321.1; 361/321.4; 361/311; 361/312; 361/313] | 6 Claims |
| 1. A dielectric ceramic composition comprising
BamTiO2+m wherein “m” satisfies 0.99≤m≤1.01,
BanZrO2+n wherein “n” satisfies 0.99≤n≤1.01,
an oxide of Mg,
an oxide of R wherein R is at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
an oxide of at least one element selected from Mn, Cr, Co and Fe, and
an oxide of at least one element selected from Si, Li, Al, Ge and B; wherein a ratio of each component, calculated as a conversion of an oxide or composite oxide, with respect to 100 moles of
said BamTiO2+m is
BanZrO2+n: 35 to 65 moles,
an oxide of Mg: 4 to 12 moles,
an oxide of R: 4 to 15 moles,
an oxide of Mn, Cr, Co and Fe: 0.5 to 3 moles, and
an oxide of Si, Li, Al, Ge and B: 3 to 9 moles.
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