Patent ID: 11915876
Assignee: TDK CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A ceramic electronic device comprising:
an element body including a ceramic layer and an internal electrode layer; and
an external electrode electrically connected to at least one end of the internal electrode layer; wherein
the element body includes an interface part at least at a part of a boundary between the external electrode and the ceramic layer,
the interface part includes an oxide containing aluminium and an oxide containing boron,
a ratio of EB to IB (EB/IB) satisfies 1<(EB/IB),
provided that an atom ratio of boron atoms in the external electrode to a total amount of elements other than oxygen in the external electrode is defined as EB, and
an atom ratio of boron atoms in the interface part to a total amount of elements other than oxygen in the interface part is defined as IB.