公开(公告)号：US20180061572A1

公开(公告)日：2018-03-01

申请号：US15689393

申请日：2017-08-29

Applicant: TDK CORPORATION

Inventor： Yushi KANO ,  Tsutomu ODASHIMA ,  Makoto MOMOTA ,  Hiroshi SASAKI ,  Masayuki SATO ,  Toshinari TAKAHASHI

IPC: H01G4/12

CPC classification number: H01G4/1227 ,  C04B35/4682 ,  C04B35/6342 ,  C04B35/638 ,  C04B35/64 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3215 ,  C04B2235/3225 ,  C04B2235/3239 ,  C04B2235/3241 ,  C04B2235/3418 ,  C04B2235/5409 ,  C04B2235/6025 ,  C04B2235/6562 ,  C04B2235/6567 ,  C04B2235/6582 ,  C04B2235/662 ,  C04B2235/80 ,  C04B2235/85 ,  H01G4/30

Abstract: A dielectric composition contains barium titanate, an oxide of yttrium, and an oxide of magnesium. 0.70≦α/β≦1.10 is satisfied, where a content of the oxide of yttrium is α mol part in terms of Y2O3, and a content of the oxide of magnesium is β mol part in terms of MgO.

公开(公告)号：US20190237264A1

公开(公告)日：2019-08-01

申请号：US16250911

申请日：2019-01-17

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Toshinari TAKAHASHI ,  Yasuhiro ITO

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

CPC classification number: H01G4/30 ,  H01G4/008 ,  H01G4/1245

Abstract: The object of the present invention is to provide the multilayer ceramic capacitor having no deterioration of dielectric properties even in case an inhibitor of an internal electrode layer is pushed out to a dielectric layer when sintering. The multilayer ceramic capacitor 1 including a capacitor element body 10 comprising a dielectric layer 2 and an internal electrode layer 3 stacked in an alternating manner, wherein when Za represents Zr concentration of an dielectric particle in a center part 6 of the dielectric layer 2 and Zb represents Zr concentration of a dielectric particle near the internal electrode layer, 0

公开(公告)号：US20190237255A1

公开(公告)日：2019-08-01

申请号：US16250702

申请日：2019-01-17

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Toshinari TAKAHASHI ,  Yasuhiro ITO

IPC: H01G4/12 ,  C04B35/49 ,  H01G4/008 ,  H01G4/30

CPC classification number: H01G4/1245 ,  C04B35/49 ,  H01G4/008 ,  H01G4/30

Abstract: A dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime, even under high electric field intensity. A dielectric ceramic composition having a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9

公开(公告)号：US20190237254A1

公开(公告)日：2019-08-01

申请号：US16230154

申请日：2018-12-21

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Toshinari TAKAHASHI ,  Yasuhiro ITO

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

Abstract: The object of the present invention is to provide a dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime.The dielectric ceramic composition of the present invention has a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9≤m≤1.1, 0≤x≤0.5, 0≤y≤0.3, 0≤(x+y)≤0.6, and 0.03≤z≤0.3), anda first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), whereinthe dielectric ceramic composition includes a dielectric particle and a particle boundary, and the dielectric particle include a complete solid solution particle in which Zr is solid dissolved to the entire dielectric particle,when Za represents a concentration of Zr in the dielectric ceramic composition in case a concentration of Ti atom in the dielectric ceramic composition is deemed to be 100 atom % and when Zb represents an average concentration of Zr in the complete solid solution particle in case a concentration of Ti atom in the complete solid solution particle is deemed to be 100 atom %,0.7