Dielectric materials

Patent metadata

Field	Value
Publication number	US-8968603-B2
Application number	US-201113075911-A
Country	US
Kind code	B2
Filing date	Mar 30, 2011
Priority date	May 12, 2010
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A dielectric material is provided. The material includes Ca 1-x-y Ba x Sr y Ti 1 -z Cr z O 3-δ A p , wherein A is nitrogen, fluorine, or combinations thereof; x and y can vary between the value of zero and one such that 0<x<1 and 0<y<1; z can vary between the value of zero and 0.01 such that 0≦z≦0.01; and δ and p can vary between the value of zero and one such that 0≦δ≦1 and 0≦p≦1, with a proviso that z and p are not simultaneously zero. A dielectric component including the dielectric material and a system including the dielectric component are provided.

First claim

The invention claimed is:

1. A material comprising:
Ca 1-x-y Ba x Sr y Ti 1-z Cr z O 3-δ A p , in a bulk, polycrystalline form comprising grains and grain boundaries, wherein
A is nitrogen, fluorine, or combinations thereof;
0<x<1; 0<y<1; 0≦z≦0.01; 0≦δ≦1; and 0≦p≦1, with a proviso that z and p are not simultaneously zero; and
a metallic bismuth phase dispersed at the grain boundaries.

2. The material of claim 1 , wherein (x+y) is in the range from about 0.9 to about 1.

3. The material of claim 2 , wherein x is greater than or equal to 0.3, and (x+y) is equal to about 1.

4. The material of claim 3 , wherein z is greater than zero and less than or equal to 0.01, and (x+y) is equal to about 1.

5. The material of claim 4 , comprising Ba 0.3 Sr 0.7 Ti 0.995 Cr 0.005 O 3 .

6. The material of claim 4 , comprising Ba 0.4 Sr 0.6 Ti 0.998 Cr 0.002 O 3 .

7. The material of claim 1 , wherein δ is greater than zero and less than or equal to 0.5; and p is greater than zero and less than or equal to 0.4.

8. The material of claim 7 , comprising Ba 0.3 Sr 0.7 TiO 2.8 N 0.13 .

9. The material of claim 7 , comprising Ba 0.3 Sr 0.7 Ti 0.995 Cr 0.005 O 2.8 N 0.13 .

10. The material of claim 7 , comprising Ba 0.4 Sr 0.6 Ti 0.995 Cr 0.005 O 2.8 N 0.13 .

11. The material of claim 1 , comprising Ba 0.55 Sr 0.4 Ca 0.05 Ti 0.99 Cr 0.01 O 3 .

12. A dielectric component comprising:
a material comprising Ca 1-x-y Ba x Sr y Ti 1-z Cr z O 3-δ A p in a bulk, polycrystalline form comprising grains and grain boundaries, wherein
A is nitrogen, fluorine, or combinations thereof;
0<x<1; 0<y<1; 0≦z≦0.01; 0≦δ≦1; and 0≦p≦1, with a proviso that z and p are not simultaneously zero; and
a metallic bismuth phase dispersed at the grain boundaries.

13. The dielectric component of claim 12 , wherein an amount of metallic bismuth is less than about 3 mole percent of the material.

14. The dielectric component of claim 12 , wherein density of the material is greater than about 96% of the theoretical density.

15. A system comprising:
a dielectric component comprising a material comprising Ca 1-x-y Ba x Sr y Ti 1-z Cr z O 3-δ A p in a bulk, polycrystalline form comprising grains and grain boundaries, wherein
A is nitrogen, fluorine, or combinations thereof;
0<x<1; 0<y<1; 0≦z≦0.01; 0≦δ≦1; and 0≦p≦1, with a proviso that z and p are not simultaneously zero; and
a metallic bismuth phase dispersed at the grain boundaries.

Assignees

• Krishna Kalaga Murali
• Matani Lohit
• Gen Electric

Inventors

• Krishna Kalaga Murali
• Matani Lohit

Classifications

• C04B2235/85

  Intergranular or grain boundary phases · CPC title

• C04B35/47

  based on strontium titanates · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• C04B2235/6585

  at an oxygen percentage above that of air · CPC title

• C04B2235/3236

  Alkaline earth titanates · CPC title