Dielectric porcelain composition and dielectric element having the same

Patent metadata

Field	Value
Publication number	US-2016376197-A1
Application number	US-201615195979-A
Country	US
Kind code	A1
Filing date	Jun 28, 2016
Priority date	Jun 29, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A dielectric porcelain composition with a sintering density of 93% or above, is expressed by the composition formula below: 100[1−x(0.94Bi 1/2 Na 1/2 TiO 3 −0.06BaTiO 3 )−xK 0.5 Na 0.5 NbO 3 ]+αCuO+βLiF (wherein x is between 0.14 and 0.28, and α and β meet either (I) α is between 0.4 and 1.5, and β is between 0 and 2.4, or (II) α is between 0 and 1.5, and β is between 0.2 and 2.4). The dielectric porcelain composition is Pb-free and can be sintered at low temperature, as well as a dielectric element having such composition.

First claim

We/I claim:

1 . A dielectric porcelain composition with a sintering density of 93% or above, expressed by a composition formula below:
100[1 −x (0.94Bi 1/2 Na 1/2 TiO 3 −0.06BaTiO 3 )− x K 0.5 Na 0.5 NbO 3 ]+αCuO+βLiF
(wherein x is between 0.14 and 0.28, and α and β meet either (I) α is between 0.4 and 1.5, and β is between 0 and 2.4, or (II) α is between 0 and 1.5, and β is between 0.2 and 2.4).

2 . A dielectric element of laminated type having a laminate constituted by dielectric layers made of a dielectric porcelain composition according to claim 1 and internal electrode layers made of silver palladium alloy, wherein a composition of silver palladium alloy is 65 to 90 percent by weight of silver and palladium accounting for the remainder.

3 . A dielectric element according to claim 2 whose ΔC 400° C. /C 25° C. is 30% or below and whose ΔC peak /C 25° C. is 50% or below, wherein ΔC 400° C. /C 25° C. is a value obtained by dividing a difference between a capacitance at 400° C. and a capacitance at 25° C., by the capacitance at 25° C., and ΔC peak /C 25° C. is a value obtained by dividing a difference between a maximum value of capacitance at −55 to 400° C. and a capacitance at 25° C., by the capacitance at 25° C.

4 . A dielectric element according to claim 3 whose time constant RC measured at 150° C., electric field intensity of 5 kV/mm, and capacitance of 1 V, is 200 to 350 sec.

Assignees

• Taiyo Yuden Kk

Inventors

• Shimizu Hiroyuki
• Doshida Yutaka

Classifications

• H01G4/1227

  based on alkaline earth titanates · CPC title

• C04B2235/3281

  Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O · CPC title

• C04B35/475 Primary

  based on bismuth titanates · CPC title

• H01G4/008

  Selection of materials · CPC title

• C04B2235/77

  Density · CPC title