Dielectric ceramic and laminated ceramic capacitor using the same

摘要

A dielectric ceramic that includes a sintered body of BaTiO3 based ceramic grains, in which the ceramic grains each include a shell part as a surface layer part and a core part inside the shell part. The ceramic grains contain, as accessory constituents, R (R, which is a rare-earth element, is at least one selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Y) and M (M is at least one selected from the group consisting of Mg, Mn, Ni, Co, Fe, Cr, Cu, Al, Mo, W, and V). R and M are present in the shell part of the ceramic grain, and concentrations of R and M contained in the shell part are increased from a grain boundary toward the core part.

主权项

1. A dielectric ceramic comprising a sintered body including BaTiO3 based ceramic grains as main phase grains,
wherein the ceramic grains each include a shell part as a surface layer part and a core part inside the shell part, the ceramic grains contain, as accessory constituents, R and M, R is at least one rare-earth element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Y, M is at least one element selected from the group consisting of Mg, Mn, Ni, Co, Fe, Cr, Cu, Al, Mo, W, and V, the R and the M are present in the shell part of the ceramic grain, concentrations of the R and the M contained in the shell part increase from a grain boundary toward the core part, a concentration of the R at the grain boundary