公开(公告)号：US09666372B2

公开(公告)日：2017-05-30

申请号：US15064431

申请日：2016-03-08

Applicant: TDK CORPORATION

Inventor： Toshihiko Kaneko ,  Tatsuya Fujino ,  Nobuto Morigasaki ,  Yasuhiro Ito

IPC: C04B35/468 ,  H01G4/12 ,  H01G4/30 ,  C04B35/488 ,  C04B35/49

CPC classification number: H01G4/1227 ,  C04B35/4682 ,  C04B35/488 ,  C04B35/49 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3236 ,  C04B2235/3239 ,  C04B2235/3249 ,  C04B2235/3262 ,  C04B2235/3418 ,  C04B2235/5454 ,  C04B2235/6025 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6584 ,  C04B2235/6588 ,  C04B2235/768 ,  C04B2235/79 ,  C04B2235/80 ,  C04B2237/346 ,  C04B2237/68 ,  H01G4/30

Abstract: A dielectric ceramic composition including a main component having a perovskite crystal structure expressed by general formula ABO3, a first sub-component of an oxide of a rare earth element, and a second sub-component of an oxide of Si, and at least dielectric particles having a core-shell structure and segregated particles, in which a concentration of the rare earth element in the segregated particles is two or more times an average concentration of the rare earth element in a shell portion of the dielectric particles having the core-shell structure, and an area of the region occupied by the segregated particles is 5.0% or less and an average of cross-sectional areas of the respective segregated particles is 0.075 μm2 or less in a cross-section obtained by cutting the dielectric ceramic composition.

公开(公告)号：US09688582B2

公开(公告)日：2017-06-27

申请号：US15064436

申请日：2016-03-08

Applicant: TDK CORPORATION

Inventor： Toshihiko Kaneko ,  Tatsuya Fujino ,  Takeru Yoshida ,  Haruki Ebina ,  Nobuto Morigasaki

IPC: C04B35/468 ,  H01G4/12 ,  C04B35/465 ,  C04B35/47 ,  C04B35/488 ,  C04B35/49 ,  H01G4/30

CPC classification number: C04B35/4682 ,  C04B35/465 ,  C04B35/47 ,  C04B35/488 ,  C04B35/49 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3236 ,  C04B2235/3239 ,  C04B2235/3248 ,  C04B2235/3249 ,  C04B2235/3256 ,  C04B2235/3258 ,  C04B2235/3262 ,  C04B2235/3418 ,  C04B2235/5454 ,  C04B2235/6025 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6584 ,  C04B2235/6588 ,  C04B2235/768 ,  C04B2235/79 ,  C04B2237/68 ,  H01G4/1209 ,  H01G4/1227 ,  H01G4/1236 ,  H01G4/1245 ,  H01G4/30

Abstract: A dielectric ceramic composition and a ceramic electric device having a dielectric layer composed of the dielectric ceramic composition including a main component having a perovskite crystal structure expressed by general formula ABO3, an oxide of Eu, an oxide of Ra (Sc, Er, Tm, Yb and Lu), an oxide of Rb (Y, Dy, Ho, Tb and Gd) and an oxide of Si, in which 0.075≦α≦0.5, 0.5≦β≦3, 1.0≦γ≦4, 1.5≦δ≦5, and 0.030≦α/δ≦0.250 where a content of an oxide of Eu is α mole, a content of the oxide of Ra is β mole, a content of the oxide of Rb is γ mole, and a content of the second sub-component is δ mole with respect to 100 moles of the main component.