公开(公告)号：US20240194407A1

公开(公告)日：2024-06-13

申请号：US18339597

申请日：2023-06-22

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Sung-Yoon CHUNG ,  Ji-Sang An

IPC: H01G4/12 ,  C04B35/468 ,  C04B35/64 ,  H01G4/30

CPC classification number: H01G4/1227 ,  C04B35/4682 ,  C04B35/64 ,  H01G4/30 ,  C04B2235/3236 ,  C04B2235/3286 ,  C04B2235/3418 ,  C04B2235/656 ,  C04B2235/768 ,  C04B2235/781 ,  C04B2235/785 ,  C04B2235/85

Abstract: Provided are a dielectric material, a device including the same, and a method of preparing the dielectric material. The dielectric material includes a polycrystalline oxide including a plurality of crystal grain bulks and grain boundaries located between the plurality of crystal grain bulks, and the polycrystalline oxide includes an indium dopant in the grain boundaries.

公开(公告)号：US20230033065A1

公开(公告)日：2023-02-02

申请号：US17730105

申请日：2022-04-26

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Sung-Yoon CHUNG ,  Ji-Sang AN

IPC: C04B35/468 ,  C04B35/626 ,  C04B35/64

Abstract: Disclosed is a polycrystalline ceramic dielectric comprising: crystal grain bulks made of a barium titanate-based ceramic; and grain boundaries comprising interfaces between the crystal grain bulks, wherein the composition of the grain boundaries is controlled using dopants. By controlling the grain boundary composition using dopants so that the dopants are distributed across a width of 5 nm or less and using a nano-sized, fine-grained barium titanate-based ceramic precursor, the grain boundary structure within the polycrystals may maintain electroneutrality, and their ferroelectricity may be controlled, thereby allowing for smoother polarization reaction. Accordingly, the present disclosure provides polycrystalline ceramic dielectrics that have dielectric properties such as high permittivity and low dielectric losses in a wide frequency range, a small amount of reduction in electric field-dependent relative permittivity, high temperature stability, non-reducibility under a reduction sintering condition, and resulting high insulation resistance, and a preparation method therefor.

公开(公告)号：US20220177371A1

公开(公告)日：2022-06-09

申请号：US17531923

申请日：2021-11-22

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Sung-Yoon CHUNG ,  Ji-Sang AN ,  Hae Seung LEE

IPC: C04B35/468 ,  H01G4/12 ,  H01G4/248 ,  C04B35/64

Abstract: Disclosed are a dielectric ceramic includes a plurality of crystal grain bulks including a ceramic, and a grain boundary between the plurality of crystal grain bulks, wherein a dopant is segregated in the grain boundary.