US 11,915,876 B2
Ceramic electronic device
Toshihiro Iguchi, Tokyo (JP); Norihisa Ando, Tokyo (JP); Kenya Tamaki, Tokyo (JP); and Hisashi Kobayashi, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Jul. 6, 2022, as Appl. No. 17/858,761.
Claims priority of application No. 2021-117259 (JP), filed on Jul. 15, 2021.
Prior Publication US 2023/0034900 A1, Feb. 2, 2023
Int. Cl. H01G 4/232 (2006.01); H01G 4/30 (2006.01); H01G 4/12 (2006.01)
CPC H01G 4/2325 (2013.01) [H01G 4/1227 (2013.01); H01G 4/30 (2013.01)] 19 Claims
OG exemplary drawing
 
1. 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,
the oxide containing aluminium further includes silicon, and
an amount of aluminium atoms in the interface part is 0.3 part by mol or more provided that a total amount of aluminium atoms and silicon atoms in the interface part is 1 part by mol.