| 简介 |
A high-frequency dielectric ceramic composition comprises a perovskite crystal phase. The composition contains a rare earth element Ln, aluminum, calcium, zinc, M, and titanium wherein M is at least one of niobium and tantalum, and is represented by the formula : (1-y)xCaTiaO1+2a-(1-y)(1-x)Ca(Zn1/3M2/3)bO1+2b-yLnAlcO(3+3c)/2 wherein x and y represent molar ratios. The parameters x, y, (1-y)x, a, b, and c satisfy the relationships : 0.560 ≤ x ≤ 0.800, 0.080 ≤ y ≤ 0.180, (1-y)x ≤ 0.650, 0.985 ≤ a ≤ 1.050, 0.900 ≤ b ≤ 1.020, and 0.900 ≤ c ≤ 1.050. Zinc may be partly replaced with magnesium. The composition exhibits are suitable for use in high-frequency devices. |
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