| abstract |
Composition formula: coefficients a, b, c and d of aBaO.bCoO.cZnO.dNb 2 O 5 are 0.498 ≦ a <0.500, 0.066 ≦ b ≦ 0.132, 0.033 ≦ c ≦ Provided is a dielectric ceramic having a crystal satisfying 0.099 and 0.335 ≦ d ≦ 0.338. In addition, a crystal peak I A having a crystal composed of BaO, CoO, ZnO and Nb 2 O 5 and existing in the vicinity of 2θ = 18 ° and a crystal peak existing in the vicinity of 2θ = 31 ° in the X-ray diffraction chart. peak intensity ratio I a / I B with I B to provide a dielectric ceramic is 0.003 or more. A resonator using the dielectric ceramic as a dielectric is provided. |