公开(公告)号：US20200043657A1

公开(公告)日：2020-02-06

申请号：US16511030

申请日：2019-07-15

Applicant: TDK CORPORATION

Inventor： Takuma ARIIZUMI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/30 ,  H01G4/005 ,  C04B35/468 ,  C04B35/49 ,  C04B35/628

Abstract: The object of the present invention is to provide a multilayer ceramic electronic component having improved highly accelerated lifetime and specific permittivity. A multilayer ceramic electronic component comprising a multilayer body in which an internal electrode layer and a dielectric layer are stacked in alternating manner, wherein the dielectric layer comprises a dielectric ceramic composition having a main component expressed by a general formula ABO3 (A is Ba and the like, and B is Ti and the like) and a rare earth component R, a segregation phase including the rare earth component R exists in the dielectric layer, an area ratio of the segregation phases in a cross section along a stacking direction is 104 ppm to 961 ppm, and 96% or more of a total area of the segregation phases contact with the internal electrode layer.

公开(公告)号：US20220254570A1

公开(公告)日：2022-08-11

申请号：US17590541

申请日：2022-02-01

Applicant: TDK CORPORATION

Inventor： Takuma ARIIZUMI ,  Taku MURAKAMI ,  Nobuto MORIGASAKI ,  Toshihiko KANEKO ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/30 ,  C04B35/468

Abstract: A dielectric composition includes a main phase, first segregation phases, and second segregation phases. The main phase includes a main component having a perovskite crystal structure of ABO3 (A is one or more selected from Ba, Sr, and Ca, and B is one or more selected from Ti, Zr, and Hf). The first segregation phases include RE (one or more selected from rare earth elements), A, Si, Ti, and O. The second segregation phases include RE, A, Ti, and O and do not substantially include Si. 0.10

公开(公告)号：US20170287635A1

公开(公告)日：2017-10-05

申请号：US15466224

申请日：2017-03-22

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Nobuto MORIGASAKI ,  Tatsuya ISHII ,  Takuma ARIIZUMI ,  Shinsuke HASHIMOTO ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/248 ,  C04B35/64 ,  C04B35/49 ,  C04B35/63 ,  C04B35/626 ,  H01G4/30 ,  H01G4/012

CPC classification number: H01G4/1245 ,  C01G25/006 ,  C04B35/4682 ,  C04B35/49 ,  C04B35/6261 ,  C04B35/62675 ,  C04B35/6303 ,  C04B35/638 ,  C04B35/64 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3229 ,  C04B2235/3236 ,  C04B2235/3241 ,  C04B2235/3249 ,  C04B2235/3262 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/3287 ,  C04B2235/3409 ,  C04B2235/3418 ,  C04B2235/652 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6584 ,  C04B2235/662 ,  C04B2235/768 ,  C04B2235/81 ,  C04B2235/96 ,  H01G4/012 ,  H01G4/248 ,  H01G4/30

Abstract: A dielectric ceramic composition having good characteristic even under high electric field intensity, and particularly good IR characteristic and high temperature accelerated lifetime. The present invention is a dielectric ceramic composition comprising, a main component comprising a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, a first sub component comprising oxides of a rare earth element, a second sub component as a sintering agent, wherein said dielectric ceramic composition is a complete solid solution particle wherein the rare earth element is solid dissolved to entire dielectric particle, or a core-shell particle having high ratio of the diffusion phase, and comprises the dielectric particle having 5 to 20 atom % of the average concentration of the rare earth element in the diffusion phase, and having uniform concentration distribution of the rare earth element in the diffusion phase.

公开(公告)号：US20220254569A1

公开(公告)日：2022-08-11

申请号：US17589206

申请日：2022-01-31

Applicant: TDK CORPORATION

Inventor： Takuma ARIIZUMI ,  Taku MURAKAMI ,  Nobuto MORIGASAKI ,  Toshihiko KANEKO ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/30 ,  C04B35/468

Abstract: A dielectric composition includes a main phase and segregation phases each including RE (at least one rare earth element). The main phase includes a main component having a perovskite crystal structure of ABO3 (A is one or more selected from Ba, Sr, and Ca, and B is one or more selected from Ti, Zr, and Hf). The segregation phases are classified into first segregation phases whose atomic ratio of Si to RE is 0 or more and 0.20 or less and second segregation phases whose atomic ratio of Si to the RE is more than 0.20. 0≤S1/S2≤0.10 is satisfied on a cross section of the dielectric composition, where S1 is an area ratio of the first segregation phases, and S2 is an area ratio of the second segregation phases. An atomic ratio of Si to RE in the second segregation phases is 0.80 or less on average.

公开(公告)号：US20210304966A1

公开(公告)日：2021-09-30

申请号：US17195366

申请日：2021-03-08

Applicant: TDK CORPORATION

Inventor： Taku MURAKAMI ,  Nobuto MORIGASAKI ,  Dan SAKURAI ,  Takuma ARIIZUMI ,  Toshihiko KANEKO

IPC: H01G4/12 ,  H01G4/30 ,  C04B35/468

Abstract: A dielectric ceramic composition includes a barium titanate, an oxide of an R element, an oxide of an M element, and an oxide containing Si. The R element is one or more elements selected from Eu, Gd, Tb, Dy, Y, Ho, and Yb. The M element is one or more elements selected from Mg, Ca, Mn, V, and Cr. A ratio of an amount of the oxide of the R element in terms of R2O3 to an amount of the oxide containing Si in terms of SiO2 is 0.8:1 to 2.2:1. A ratio of an amount of the oxide of the M element in terms of MO to the amount of the oxide containing Si in terms of SiO2 is 0.2:1 to 1.8:1.50% or more of the number of dielectric particles constituting the dielectric ceramic composition is core-shell dielectric particles having a core-shell structure.

公开(公告)号：US20170287636A1

公开(公告)日：2017-10-05

申请号：US15466316

申请日：2017-03-22

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Nobuto MORIGASAKI ,  Tatsuya ISHII ,  Takuma ARIIZUMI ,  Shinsuke HASHIMOTO ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/248 ,  C04B35/49 ,  H01G4/30

CPC classification number: H01G4/1245 ,  C04B35/4682 ,  C04B35/49 ,  C04B35/6263 ,  C04B35/62675 ,  C04B35/62685 ,  C04B35/6342 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3236 ,  C04B2235/3241 ,  C04B2235/3244 ,  C04B2235/3249 ,  C04B2235/3262 ,  C04B2235/3418 ,  C04B2235/442 ,  C04B2235/6562 ,  C04B2235/6567 ,  C04B2235/6582 ,  C04B2235/6584 ,  C04B2235/663 ,  C04B2235/75 ,  C04B2235/768 ,  C04B2237/346 ,  C04B2237/68 ,  C04B2237/704 ,  H01G4/248 ,  H01G4/30

Abstract: A dielectric ceramic composition has good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition has a main component having a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, a first sub component having oxides of a rare earth element R, a second sub component as a sintering agent, wherein the dielectric particles has dielectric particles having high diffusion rate of the rare earth element, preferably of a complete solid solution particle, and when a concentration of Ti atom in the diffusion phase is 100 atom %, then an average concentration of the rare earth element R in the diffusion phase is 5 atom % or more, and an average concentration of Zr in the diffusion phase is 10 atom % or more.

公开(公告)号：US20240177936A1

公开(公告)日：2024-05-30

申请号：US18498794

申请日：2023-10-31

Applicant: TDK CORPORATION

Inventor： Taku MURAKAMI ,  Nobuto MORIGASAKI ,  Takuma ARIIZUMI ,  Yoshitaka NAGASHIMA ,  Tsubasa AOKI

IPC: H01G4/30 ,  H01G4/008 ,  H01G4/012 ,  H01G4/12

CPC classification number: H01G4/30 ,  H01G4/008 ,  H01G4/012 ,  H01G4/1227

Abstract: A multilayer electronic device includes an element body including an interior region and an exterior region and a pair of external electrodes. The interior region includes inner dielectric layers and internal electrode layers laminated alternately. The exterior region is disposed outwards from the interior region in a lamination direction. The pair of external electrodes is disposed on a surface of the element body and connected to the internal electrode layers. DRAa DRBb>DRBc are satisfied, where “RA” includes an element having a highest mole ratio among “RE” in the inner dielectric layers of a third region at a center of the interior region in the lamination direction, “RB” includes an element having a highest mole ratio among “RE” in a first region at a center of the exterior region in the lamination direction, and “RA” and “RB” are different from each other.

公开(公告)号：US20220254568A1

公开(公告)日：2022-08-11

申请号：US17588582

申请日：2022-01-31

Applicant: TDK CORPORATION

Inventor： Taku MURAKAMI ,  Nobuto MORIGASAKI ,  Takuma ARIIZUMI ,  Toshihiko KANEKO ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/30 ,  C04B35/468

Abstract: A dielectric composition includes main-phase particles each including a main component having a perovskite crystal structure represented by a general formula of ABO3. At least a part of the main-phase particles has a core-shell structure. The dielectric composition includes RA, RB, M, and Si. Each of A, B, RA, RB, and M is one or more elements selected from a specific element group. SRA/SRB>CRA/CRB is satisfied, where CRA is an RA content (mol %) to the main component in terms of RA2O3, and CRB is an RB content (mol %) to the main component in terms of RB2O3, in the dielectric composition, and SRA is an average RA content (mol %), and SRB is an average RB content (mol %), in a shell part of the core-shell structure.

公开(公告)号：US20200039887A1

公开(公告)日：2020-02-06

申请号：US16511286

申请日：2019-07-15

Applicant: TDK CORPORATION

Inventor： Takuma ARIIZUMI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Yasuhiro ITO

IPC: C04B35/47 ,  C04B35/468 ,  C04B35/49 ,  H01G4/12 ,  H01G4/30 ,  H01G4/005 ,  C04B35/628

Abstract: The object of the present invention is to provide a dielectric ceramic composition having even improved insulation specific resistance and highly accelerated lifetime. A dielectric ceramic composition comprising a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO3 (A is Ba and the like; and B is Ti and the like) and a rare earth element component R, in which a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more, and a rare earth element concentration gradient S is −0.010 atom %/nm≤S≤0.009 atom %/nm or a rare earth element concentration variation satisfies σ/C≤0.15 (a is a standard deviation of a rare earth element concentration and C is an average rare earth element concentration).

公开(公告)号：US20250059095A1

公开(公告)日：2025-02-20

申请号：US18761881

申请日：2024-07-02

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Kenichiro MASUDA ,  Tetsuya YOSHIYAMA ,  Takuma ARIIZUMI ,  Toshio ASAHI

IPC: C04B35/468 ,  H01G4/12 ,  H01G4/30

Abstract: A dielectric composition includes main phase grains and segregation grains. The segregation grains at least partly include Ba—Mg—Si—O segregation grains including Ba, Mg, Si, and O. Ba, Mg, and Si in the Ba—Mg—Si—O segregation grains constitute 70 parts by mol or more in total out of 100 parts by mol of a total of metal elements and Si in the Ba—Mg—Si—O segregation grains.