Multilayer ceramic capacitor and method of manufacturing the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsHyoju Lee, Sanghyun Lee, Tae Hyung Kim, Nam Woon Kim
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Abstract
Provided are a multilayer ceramic capacitor and a method of manufacturing the same, the multilayer ceramic capacitor including a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface the capacitor body, wherein the dielectric layer includes a plurality of dielectric grains, at least one of the plurality of dielectric grains includes a dielectric composite in which a barium titanate-based compound is doped with hafnium (Hf) or a first transition metal; and a subcomponent including a rare earth element, a second transition metal, or a combination thereof.
Claims24
A multilayer ceramic capacitor, comprising
- a capacitor body including a dielectric layer and an internal electrode layer, and
- an external electrode disposed on an outer surface of the capacitor body,
- wherein the dielectric layer includes a plurality of dielectric grains,
- at least one of the plurality of dielectric grains includes:
- a dielectric composite in which a barium titanate-based compound is doped with hafnium (Hf) or a first transition metal;
- and a subcomponent including a rare earth element, a second transition metal, or a combination thereof,
- according to a TEM-EDS (transmission electron microscopy-energy dispersive spectroscopy) line analysis of the at least one of the plurality of dielectric grains from a center to a grain boundary of the at least one of the plurality of dielectric grains, a first point having a maximum atom percent (at %) of hafnium (Hf) or the first transition metal with respect to a total number of atoms of the at least one of the plurality of dielectric grains is different from a location of a second point having a maximum atom percent (at %) of the rare earth element or the second transition metal with respect to the total number of atoms of the at least one of the plurality of dielectric grains, and
- the first transition metal excludes hafnium (Hf), and the first transition metal and the second transition metal are different from each other.
A method of manufacturing a multilayer ceramic capacitor, comprising
- preparing a dielectric composite powder in which a barium titanate-based compound is doped with hafnium (Hf) or a first transition metal (TM);
- manufacturing a dielectric green sheet using a dielectric slurry including the dielectric composite powder and subcomponent powder, and forming a conductive paste layer on a surface of the dielectric green sheet;
- manufacturing a dielectric green sheet stack by stacking the dielectric green sheets on which the conductive paste layer is formed;
- manufacturing a capacitor body including a dielectric layer and an internal electrode layer by firing the dielectric green sheet stack;
- and
- forming an external electrode on one surface of the capacitor body,
- wherein the dielectric layer includes a plurality of dielectric grains,
- at least one of the plurality of dielectric grains includes a dielectric composite in which a barium titanate-based compound is doped with hafnium (Hf) or a first transition metal;
- and a subcomponent including a rare earth element, a second transition metal, or a combination thereof,
- according to the TEM-EDS (transmission electron microscopy-energy dispersive spectroscopy) line analysis of the at least one of the plurality of dielectric grains from a center to a grain boundary of the at least one of the plurality of dielectric grains, a first point having a maximum atom percent (at %) of hafnium (Hf) or the first transition metal with respect to a total number of atoms of the at least one of the plurality of dielectric grains is different from a location of a second point having a maximum atom percent (at %) of the rare earth element or the second transition metal with respect to a total number of atoms of the at least one of the plurality of dielectric grains, and
- the first transition metal excludes hafnium (Hf), and the first transition metal and the second transition metal are different from each other.
Dependencies are inferred from the claim text.