Patent ID: 6489257
Filing Date: 2002-12-03
Classification: H01G

Abstract:
A dielectric ceramic material comprising a component represented by the formula ABO3 and a rare earth element serving as an additional component, A in the formula representing Ba, Ca, Sr or a combination thereof, B in the formula representing Ti, Zr, Hf or a combination thereof, and O in the formula representing oxygen, wherein0.7&lE;M/N and0.8&lE;L/N where M is the number of crystal grains that constitute the ceramic and which satisfy 0.5&lE;Di/D, N is the number of crystal grains constituting the ceramic, and L is the number of crystal grains constituting the ceramic in which 0.5&lE;Di/D and Si/D&lE;0.3 wherein Di is the mean density of the rare earth element in an arbitrary crystal grain i of the crystal grains that constitute the ceramic material, D is the mean density of the rare earth element in the entirety of the ceramic material and Si is the standard deviation of the density of the rare earth element in the crystal grain i.