Dielectric composition and multilayer ceramic capacitor containing the same

A multilayer ceramic capacitor comprising:

• a ceramic body including dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween;
• and
• first and second external electrodes disposed on outer surfaces of the ceramic body,
• wherein the dielectric layer contains a first crystal grain composed of a core part having a non-zero zirconium (Zr) content of 3.0 at % or less, based on 100 at % of the core part, and a shell part having a Zr content of 4.0 to 15.0 at %, based on 100 at % of the shell part, and a number fraction of the first crystal grain to all crystal grains in the dielectric layer is 4% or more,
• wherein the dielectric layer is formed of a dielectric composition containing a base material powder composed of Ba(Ti1-xZrx)O3 as a first main ingredient and Ba(Ti1-yZry)O3 as a second main ingredient, the first and second main ingredients having different contents of Zr from each other,
• wherein the dielectric composition further contains a fifth accessory ingredient, an oxide or carbonate containing Mg or Al corresponding to a fixed-valence acceptor element, in a content of 0.0 to 2.0 at %, based on 100 at % of the base material powder.