Dielectric composition and multilayer capacitor

Patent metadata

Field	Value
Publication number	US-2023215635-A1
Application number	US-202218080349-A
Country	US
Kind code	A1
Filing date	Dec 13, 2022
Priority date	Dec 30, 2021
Publication date	Jul 6, 2023
Grant date	—

Abstract

A dielectric composition and a multilayer capacitor including the same are disclosed. The dielectric composition including: a BaTiO 3 -based main ingredient; a first auxiliary ingredient including rare earth elements; and a second auxiliary ingredient including at least one of Ba and Ca but essentially including Ba, wherein the rare earth elements include Tb and Dy, and the first auxiliary ingredient and the second auxiliary ingredient satisfy a molar content condition of 0.40<(Tb/T_RE)*(Ba+Ca)<0.93, where T_RE is a total molar content of the rare earth elements in the first auxiliary ingredient.

First claim

What is claimed is:

1 . A dielectric composition comprising:
a BaTiO 3 -based main ingredient; a first auxiliary ingredient including rare earth elements; and a second auxiliary ingredient including at least one of Ba and Ca, wherein the rare earth elements include Tb and Dy, and the first auxiliary ingredient and the second auxiliary ingredient satisfy a molar content condition of 0.40<(Tb/T_RE)*(Ba+Ca)<0.93, where T_RE is a total molar content of the rare earth elements in the first auxiliary ingredient.

2 . The dielectric composition of claim 1 , wherein Tb and Dy molar contents satisfy a condition of 0.35≤Tb/Dy≤1.20.

3 . The dielectric composition of claim 1 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.26≤Tb/T_RE≤0.55.

4 . The dielectric composition of claim 1 , wherein Ba and Ca molar contents satisfy a condition of 0≤Ca/(Ba+Ca)≤0.30.

5 . The dielectric composition of claim 1 , wherein the rare earth elements do not include a rare earth element other than Tb and Dy.

6 . The dielectric composition of claim 1 , wherein the second auxiliary ingredient includes Ba.

7 . The dielectric composition of claim 1 , wherein Tb and Dy molar contents satisfy a condition of 0.86≤Tb/Dy≤1.20.

8 . The dielectric composition of claim 1 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.46≤Tb/T_RE≤0.55.

9 . A multilayer capacitor comprising:
a body including a dielectric layer and a plurality of internal electrodes stacked with the dielectric layer interposed therebetween; and external electrodes disposed on the body and connected to the plurality of internal electrodes, wherein the dielectric layer includes a dielectric grain having a core-shell structure including a core portion and a shell portion, the shell portion having a different composition from the core portion, the shell portion includes a BaTiO 3 -based main ingredient, a first auxiliary ingredient including rare earth elements, and a second auxiliary ingredient including at least one of Ba and Ca, the rare earth elements include Tb and Dy, and the first auxiliary ingredient and the second auxiliary ingredient satisfy a molar content condition of 0.40<(Tb/T_RE)*(Ba+Ca)<0.93, where T_RE is a total molar content of the rare earth elements in the first auxiliary ingredient.

10 . The multilayer capacitor of claim 9 , wherein D1 satisfies a condition of 5 nm≤D1≤100 nm, where D1 is a diameter of the core portion.

11 . The multilayer capacitor of claim 9 , wherein D2 satisfies a condition of 50 nm≤D2≤600 nm, where D2 is a diameter of the dielectric grain.

12 . The multilayer capacitor of claim 9 , wherein Tb and Dy molar contents satisfy a condition of 0.35≤Tb/Dy≤1.20.

13 . The multilayer capacitor of claim 9 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.26≤Tb/T_RE≤0.55.

14 . The multilayer capacitor of claim 9 , wherein Ba and Ca molar contents satisfy a condition of 0≤Ca/(Ba+Ca)≤0.30.

15 . The multilayer capacitor of claim 9 , wherein the rare earth elements do not include a rare earth element other than Tb and Dy.

16 . The multilayer capacitor of claim 9 , wherein the second auxiliary ingredient includes Ba.

17 . The multilayer capacitor of claim 9 , wherein Tb and Dy molar contents satisfy a condition of 0.86≤Tb/Dy≤1.20.

18 . The multilayer capacitor of claim 9 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.46≤Tb/T_RE≤0.55.

19 . A dielectric composition comprising:
a BaTiO 3 -based main ingredient; a first auxiliary ingredient including rare earth elements; and a second auxiliary ingredient including at least one of Ba and Ca, wherein the rare earth elements include Gd and Dy, and the first auxiliary ingredient and the second auxiliary ingredient satisfy a molar content condition of 0.34<(Gd/T_RE)*(Ba+Ca)<0.68, where T_RE is a total molar content of the rare earth elements in the first auxiliary ingredient.

20 . The dielectric composition of claim 19 , wherein Gd and Dy molar contents satisfy a condition of 0.42≤Gd/Dy≤0.60.

21 . The dielectric composition of claim 19 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.30≤Gd/T_RE≤0.38.

22 . The dielectric composition of claim 19 , wherein Ba and Ca molar contents satisfy a condition of 0≤Ca/(Ba+Ca)≤0.30.

23 . The dielectric composition of claim 19 , wherein the rare earth elements do not include a rare earth element other than Gd and Dy.

24 . The dielectric composition of claim 19 , wherein the second auxiliary ingredient includes Ba.

25 . The dielectric composition of claim 19 , wherein the second auxiliary ingredient includes BaCO 3 .

26 . The dielectric composition of claim 19 , wherein the second auxiliary ingredient is free of Ca.

27 . A multilayer capacitor comprising:
a body including a dielectric layer and a plurality of internal electrodes stacked with the dielectric layer interposed therebetween; and external electrodes disposed on the body and connected to the plurality of internal electrodes, wherein the dielectric layer includes a dielectric grain having a core-shell structure including a core portion and a shell portion, the shell portion having a different composition from the core portion, the shell portion includes a BaTiO 3 -based main ingredient, a first auxiliary ingredient including rare earth elements, and a second auxiliary ingredient including at least one of Ba and Ca, the rare earth elements include Gd and Dy, and the first auxiliary ingredient and the second auxiliary ingredient satisfy a molar content condition of 0.34<(Gd/T_RE)*(Ba+Ca)<0.68, where T_RE is a total molar content of the rare earth elements in the first auxiliary ingredient.

28 . The multilayer capacitor of claim 27 , wherein D1 satisfies a condition of 5 nm≤D1≤100 nm, where D1 is a diameter of the core portion.

29 . The multilayer capacitor of claim 27 , wherein D2 satisfies a condition of 50 nm≤D2≤600 nm, where D2 is a diameter of the dielectric grain.

30 . The multilayer capacitor of claim 27 , wherein Gd and Dy molar contents satisfy a condition of 0.42≤Gd/Dy≤0.60.

31 . The multilayer capacitor of claim 27 , wherein a molar content of the first auxiliary ingredient satisfies a condition of 0.30≤Gd/T_RE≤0.38.

32 . The multilayer capacitor of claim 27 , wherein Ba and Ca molar contents satisfy a condition of 0≤Ca/(Ba+Ca)≤0.30.

33 . The multilayer capacitor of claim 27 , wherein the rare earth elements do not include a rare earth element other than Gd and Dy.

34 . The multilayer capacitor of claim 27 , wherein the second auxiliary ingredient includes Ba.

35 . The multilayer capacitor of claim 27 , wherein the second auxiliary ingredient is free of Ca.

Assignees

• Samsung Electro Mech

Inventors

• Park Jae Sung
• Kim Hyoung Uk
• Lee Je Hee
• Jeon Hyung Joon
• Lee Jong Ho

Classifications

• C04B2235/3236

  Alkaline earth titanates · CPC title

• C04B2235/442

  Carbonates · CPC title

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• C04B35/4682 Primary

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title