# US 11,114,243 B2 · Multilayer ceramic capacitor and method for producing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,243 B2 - Document ID: US11114243B2 - Status: Granted - Kind: B2 - Application number: 16/383,716 - Filed: 2019-04-15 - Published: 2019-10-31 - Granted: 2021-09-07 - Earliest claimed: 2018-04-27 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Hiroaki Sugita - Web page: https://patentgrep.com/patent/US11114243B2 ## CPC - H01G 4/1236: {based on zirconium oxides or zirconates (H01G4/1263 takes precedence)} - H01G 4/0085: {Fried electrodes} - H01G 4/012: Form of non-self-supporting electrodes - H01G 4/1227: {based on alkaline earth titanates} - H01G 4/2325: {characterised by the material of the terminals} - H01G 4/248: the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence) - H01G 4/30: Stacked capacitors (H01G4/33 takes precedence) - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) ## Abstract A multilayer ceramic capacitor has a cuboid or substantially cuboid multilayer body including a stack of dielectric layers, inner-electrode layers alternating with the dielectric layers and exposed at end surfaces of the multilayer body, and outer electrodes on the end surfaces and coupled to the inner-electrode layers. The dielectric layers are primarily made of barium titanate. At the interfaces between the dielectric and inner-electrode layers, protective layers containing calcium zirconate cover the inner-electrode layers. ## Claims ### Claim 1 A multilayer ceramic capacitor comprising: a multilayer body including: a stack of a plurality of dielectric layers; first and second primary surfaces opposite to each other in a stacking direction; first and second lateral surfaces opposite to each other in a width direction perpendicular to the stacking direction; and first and second end surfaces opposite to each other in a length direction perpendicular to both the stacking direction and the width direction; a plurality of inner-electrode layers alternating with the dielectric layers and exposed at the end surfaces; and outer electrodes disposed on the end surfaces and connected to the inner-electrode layers; wherein the dielectric layers include barium titanate as a primary component; and protective layers containing calcium zirconate covering the inner-electrode layers are located at interfaces between the dielectric layers and the inner-electrode layers. ### Claim 2 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the protective layers have a thickness of about 1.5% or more and about 15% or less with respect to a thickness of the dielectric layers. ### Claim 3 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the multilayer body includes two outer-layer sections each defined by multiple ones of the plurality of dielectric layers, and an inner-layer section defined by one or more of the plurality of dielectric layers and multiple ones of the plurality of inner-electrode layers; and the two outer-layer sections have thicknesses of about 20 μm or more and about 200 μm or less. ### Claim 4 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the plurality of dielectric layers include at least one of Mn, Fe, Cr, Co, and Ni. ### Claim 5 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein a thickness of each of the plurality of dielectric layers is about 0.70 μm or more and about 1.50 μm or less. ### Claim 6 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the plurality of inner-electrode layers are made of at least one of Ni, Cu, Ag, Pd, Au, and alloys containing Ni, Cu, Ag, Pd, and Au. ### Claim 7 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein a thickness of each of the plurality of inner-electrode layers is about 0.2 μm or more and about 2.0 μm or less. ### Claim 8 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the plurality of inner-electrode layers define first and second inner-electrodes layers which are respectively connected to different ones of the outer electrodes. ### Claim 9 (depends on 8) The multilayer ceramic capacitor according to claim 8, wherein the plurality of inner-electrode layers include floating inner-electrode layers which are provided between the first and second inner-electrodes layers; and the floating inner-electrode layers are not connected to the outer electrodes. ### Claim 10 (depends on 9) The multilayer ceramic capacitor according to claim 9, wherein the first and second inner-electrodes layers and the floating inner-electrode layers define multiple divided facing-electrode sections generating individual capacitances. ### Claim 11 (depends on 1) The multilayer ceramic capacitor according to claim 1, wherein the outer electrodes include a substrate electrode layer and a plating layer. ### Claim 12 (depends on 11) The multilayer ceramic capacitor according to claim 11, wherein the substrate electrode layer contacts and partially covers each of the first and second primary surfaces and the first and second lateral surfaces. ### Claim 13 (depends on 12) The multilayer ceramic capacitor according to claim 12, wherein the substrate electrode layer includes a baked layer that includes: (i) a metal including at least one of Cu, Ni, Ag, Pd, Ag—Pd alloys, Au, and (ii) a glass including at least one of B, Si, Ba, Mg, Al, Li. ### Claim 14 (depends on 12) The multilayer ceramic capacitor according to claim 12, wherein the substrate electrode layer has a thickness of about 10 μm or more and about 50 μm. ### Claim 15 (depends on 12) The multilayer ceramic capacitor according to claim 12, wherein the substrate electrode layer includes an electrically conductive resin layer. ### Claim 16 (depends on 15) The multilayer ceramic capacitor according to claim 15, wherein the electrically conductive resin layer includes a thermosetting resin and metal. ### Claim 17 (depends on 15) The multilayer ceramic capacitor according to claim 15, wherein a thickness of the electrically conductive resin layer is about 10 μm or more and about 150 μm or less. ### Claim 18 (depends on 11) The multilayer ceramic capacitor according to claim 11, wherein the plating layer includes a lower plating electrode on the multilayer body and an upper plating electrode on a surface of the lower plating electrode.