Reduction-resistant dielectric ceramic compact and laminated ceramic capacitor
First Claim
1. A reduction-resistant dielectric ceramic compact comprising:
- a solid solution comprising barium titanate as a primary component and an auxiliary sintering agent which has an x-ray diffraction crystalline axis ratio c/a in a temperature range of −
25°
C. or above of 1.000≦
c/a≦
1.003 and a maximum peak for temperature dependence of a dielectric constant measured at an electric strength of 2 Vrms/mm or less and at an AC frequency of 1 kHz at a temperature of below −
25°
C., wherein the primary component is represented by the formulaABO3+aR+bM, in whichABO3 is a barium titanate-based perovskite compound having A-site and B-site elements such that 1.000<
A/B≦
1.035, R is a compound containing at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, M is a compound containing at least one element selected from the group consisting of Mn, Ni, Mg, Fe, Al, Cr and Zn, and a and b are in moles such that 0.005≦
a≦
0.12, and 0.005≦
b≦
0.12.
1 Assignment
0 Petitions
Accused Products
Abstract
A dielectric ceramic compact is provided which can decrease loss and heat generation under high frequency and high voltage or large current conditions, which exhibits a stable insulating resistance by AC or DC loading, and which can form a laminated ceramic capacitor using nickel or the like as an internal electrode material. The reduction-resistant dielectric ceramic compact is formed of an auxiliary sintering agent and a solid solution containing barium titanate as a primary component represented by the formula ABO3+aR+bM, where R is a compound containing an element such as La, and M is a compound containing an element such as Mn. In addition, 1.000<A/B≦1.035, 0.005≦a≦0.12, and 0.005≦b≦0.12. Furthermore, in the ceramic, the crystalline axis ratio c/a obtained by x-ray diffraction in a temperature range of −25° C. or above satisfies 1.000≦c/a≦1.003, and in temperature dependence of relative dielectric constant measured at an electric field of 2 Vrms/mm or less and at a frequency of 1 kHz, the maximum peak is present at a temperature of below −25° C.
19 Citations
21 Claims
-
1. A reduction-resistant dielectric ceramic compact comprising:
-
a solid solution comprising barium titanate as a primary component and an auxiliary sintering agent which has an x-ray diffraction crystalline axis ratio c/a in a temperature range of −
25°
C. or above of 1.000≦
c/a≦
1.003 and a maximum peak for temperature dependence of a dielectric constant measured at an electric strength of 2 Vrms/mm or less and at an AC frequency of 1 kHz at a temperature of below −
25°
C.,wherein the primary component is represented by the formula ABO3+aR+bM, in which ABO3 is a barium titanate-based perovskite compound having A-site and B-site elements such that 1.000<
A/B≦
1.035,R is a compound containing at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, M is a compound containing at least one element selected from the group consisting of Mn, Ni, Mg, Fe, Al, Cr and Zn, and a and b are in moles such that 0.005≦
a≦
0.12, and 0.005≦
b≦
0.12. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification