Patent ID: 6051515
Filing Date: 2000-04-18
Classification: C04B,H01P

Abstract:
A dielectric ceramic comprising a perovskite crystal phase being precipitated as a main crystal phase and a complex oxide crystal phase other than the perovskite crystal phase being precipitated as a sub-crystal phase, wherein the perovskite crystal phase contains Mg, W, at least one element selected from the group consisting of iron family metal elements and Zn, Ba and Sr as metal elements, the complex oxide crystal phase contains W and at least one element selected from the group consisting of Ba and Sr as metal elements, and the main crystal phase and the sub-crystal phase have a peak intensity ratio by X-ray diffraction of the formula (1):I.sub.112 /I.sub.211 <0.10 (1)wherein I.sub.112 represents the peak intensity ratio of the (112) plane in a tetragonal system of the sub-crystal phase, and I211 represents the peak intensity ratio of the (211) plane in a rhombohedral system of the main crystal phase.