CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims benefit of priority to Korean Patent Application No. 10-2019-0070783 filed on Jun. 14, 2019 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to a dielectric ceramic composition having improved reliability and a multilayer ceramic capacitor including the same.

Description of Related Art

Generally, electronic components using a ceramic material such as a capacitor, an inductor, a piezoelectric element, a varistor, a thermistor, or the like, include a ceramic body formed of a ceramic material, internal electrodes formed in the body and external electrodes mounted on a surface of the ceramic body to be connected to the internal electrodes.

As there is a recent trend for electronic products to be miniaturized and multifunctionalized along with chip components, there is a requirement for multilayer ceramic capacitors which are smaller in size but which have greater capacity.

A method for both miniaturizing a multilayer ceramic capacitor and increasing the capacity thereof simultaneously is to reduce thicknesses of the internal dielectric layers and electrode layers to laminate a larger number of the layers. Currently, the thickness of the internal dielectric layer is about 0.6 μm, and there have been efforts to develop thinner dielectric layers.

Under such circumstances, ensuring reliability of dielectric layers is emerging as a major issue of dielectric materials. In addition, difficulties in managing quality and yield have become an issue due to increased degradation of insulation resistance of dielectric materials.

To resolve such problems, there is a need to develop a new method for ensuring high reliability with respect not only to a structure of a multilayer ceramic capacitor, but particularly to a composition of a dielectric.

When a dielectric composition capable of improving the current reliability is secured, a thinner multilayer ceramic capacitor can be manufactured.

SUMMARY

An aspect of the present disclosure is to provide a dielectric ceramic composition having improved reliability and a multilayer ceramic capacitor including the same.

According to an aspect of the present disclosure, a dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient. The accessory ingredient includes dysprosium (Dy) and neodymium (Nd) as first accessory ingredients. A total content of Nd included in the dielectric ceramic composition is less than 0.699 mol % based on 100 mol % of titanium (Ti) of the base material main ingredient.

According to another aspect of the present disclosure, a multilayer ceramic capacitor includes 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 external surfaces of the ceramic body. The first external electrode is electrically connected to the first internal electrode, and the second external electrode is electrically connected to the second internal electrode, and the dielectric layers include dielectric grains including a dielectric ceramic composition. The dielectric ceramic composition includes a BaTiO3-based base material main ingredient and an accessory ingredient, where the accessory ingredient includes Dy and Nd as first accessory ingredients. A total content of Nd is less than 0.699 mol % based on 100 mol % of Ti of the base material main ingredient.

