Multilayer ceramic capacitor and method for manufacturing the same

A multilayer ceramic capacitor comprising a capacitor body formed by alternately laminating a dielectric layer and an internal electrode layer, and an external electrode formed on both ends of the capacitor body,

• wherein the dielectric layer comprises a grain boundary phase and at least two types of crystal grains that Ba and Ti as main components, and differ from one another in Sr component concentration, and
• the crystal grains contains Mg, a rare earth element, and Mn, and satisfy the relationship of A/B≧1.003 in mole ratio, where A is a sum of Ba and Sr;
• and B is an amount of Ti.

A multilayer ceramic capacitor comprising a capacitor body formed by alternately laminating a dielectric layer and an internal electrode layer, and an external electrode formed on both ends of the capacitor body,

• wherein the dielectric layer comprises a grain boundary phase and at least two types of crystal grains that comprise Ba and Ti as main components, and differ from one another in Ca component concentration and Zr component concentration, and
• the crystal grains containing Mg, a rare earth element, and Mn, and satisfy the relationship of A/B≧1.003 in mole ratio, where A is a sum of Ba and Ca in the dielectric layer;
• and B is a sum of Ti and Zr.

A multilayer ceramic capacitor comprising a capacitor body formed by alternately laminating a dielectric layer and an internal electrode layer, and an external electrode formed on both ends of the capacitor body,

• wherein the dielectric layer comprises a grain boundary phase and at least two types of crystal grains that comprise Ba and Ti as main components, and differ from one another in Ca component concentration and Sr component concentration, and satisfy the relationship of A/B≧1.003 in mole ratio, where A is a sum of Ba, Ca, and Sr in the dielectric layer;
• and B is an amount of Ti.

A multilayer ceramic capacitor comprising a capacitor body formed by alternately laminating a dielectric layer and an internal electrode layer, and an external electrode formed on both ends of the capacitor body,

• wherein the dielectric layer comprises a grain boundary phase and a BCT crystal grain that comprises Ba and Ti as main components, and is not less than 0.4 atomic % in Ca component concentration and not more than 0.2 atomic % in Zr component concentration, and a BCTZ crystal grain that comprises Ba and Ti as main components, and is not less than 0.4 atomic % in Ca component concentration and not less than 0.4 atomic % in Zr component concentration, and satisfies the relationship of A/B≧1.003 in mole ratio, where A is a sum of Ba and Ca in the dielectric layer;
• and B is a sum of Ti and Zr.