公开(公告)号：US20190300435A1

公开(公告)日：2019-10-03

申请号：US16356363

申请日：2019-03-18

Applicant: TDK Corporation

Inventor： Liang LIPING ,  Liu HAILONG ,  Daisuke OHTSU

IPC: C04B35/468 ,  H01G4/12 ,  H01G4/10

Abstract: A dielectric composition having a high temperature property, good specific permittivity and AC breakdown voltage, and low dielectric loss at normal temperature, even though lead is not substantially used. The dielectric composition includes barium titanate, strontium titanate, and bismuth calcium titanate constituting a main component and a subcomponent. The dielectric composition includes a first subcomponent constituted by at least one selected from a compound including manganese, a compound including iron, and a compound including chromium, and the first sub component is included in a ratio of 0.02 to 0.19 wt % in terms of total of MnCo3, Fe2O3, and Cr2O3 with respect to 100 wt % of the main component, and the dielectric composition includes a second subcomponent which is a compound including niobium, and the second subcomponent is included in a ratio of 0.1 to 3 wt % in terms of Nb2O5 with respect to 100 wt % of the main component.

公开(公告)号：US20190300437A1

公开(公告)日：2019-10-03

申请号：US16358041

申请日：2019-03-19

Applicant: TDK CORPORATION

Inventor： Liu HAILONG ,  Liang LIPING ,  Daisuke OHTSU

IPC: C04B35/468 ,  H01G4/008 ,  H01G4/12 ,  C04B35/626 ,  C04B35/634 ,  C04B35/64

Abstract: A dielectric composition has barium, strontium, and bismuth calcium titanates constituting a main component and subcomponent. “a” mol % represents a content of barium titanate in terms of BaTiO3, “b” mol % strontium titanate in terms of SrTiO3, and “c” mol % bismuth calcium titanate in terms of CaBi4Ti4O15 in the main component composition. a+b+c=100 is satisfied, 50≤a≤83, 12≤b≤49.5, 0.5≤c≤5. The dielectric composition includes a first subcomponent constituted by at least one compound including one of manganese, iron, and chromium. The first subcomponent is included in a ratio of 0.2 wt % or more and 3 wt % or less in terms of total of MnCO3, Fe2O3, and Cr2O3 with respect to 100 wt % of the main component. The dielectric composition includes a second subcomponent compound including niobium, included in a ratio of 0.1 wt % or more and 3 wt % or less in terms of Nb2O5 with respect to 100 wt % of the main component.

公开(公告)号：US20190300436A1

公开(公告)日：2019-10-03

申请号：US16357860

申请日：2019-03-19

Applicant: TDK CORPORATION

Inventor： Daisuke OHTSU ,  Taku MASAI ,  Liu HAILONG ,  Liang LIPING

IPC: C04B35/468 ,  C04B35/47 ,  C04B35/475

Abstract: The object of the present invention is to provide the dielectric composition having good specific permittivity, high DC breakdown voltage and AC breakdown voltage, small dielectric loss and heat generating property, and good temperature property even though lead is not substantially used. A dielectric composition of the first aspect includes a, Ca, Bi, Ti, and Sr, wherein the dielectric composition includes two phases having different Sr characteristic X ray intensities when a characteristic X ray intensity derived from Sr is measured by EPMA, and when Sr1 represents the characteristic X ray intensity derived from Sr of a first phase measured by EPMA and Sr2 represents the characteristic X ray intensity derived from Sr of a second phase measured by EPMA, a ratio (Sr2/Sr1) of Sr2 with respect to Sr1 satisfies 2 or larger. A dielectric composition of the second aspect includes Ba, Ca, Bi, Ti, and Sr, wherein the dielectric composition includes three phases having different Sr characteristic X ray intensities when a characteristic X ray intensity derived from Sr is measured by EPMA, and when Sr1 represents the characteristic X ray intensity derived from Sr of a first phase measured by EPMA, Sr2 represents the characteristic X ray intensity derived from Sr of a second phase measured by EPMA, and Sr3 represents the characteristic X ray intensity derived from Sr of a third phase measured by EPMA, an intensity ratio (Sr1/Sr3) of Sr1 with respect to Sr3 is 0.6 or less and an intensity ratio (Sr2/Sr3) of Sr2 with respect to Sr3 is 1.4 or more.