IP Library › Granted Patent US 12,381,025
Granted Patent B2
US 12,381,025 · App. 17/741,746 · Granted Aug 5, 2025

Low loss magnetodielectric material

Inventors: Yajie Chen (Brighton, MA); Lance Young (Shrewsbury, MA); Qifan Li (Hubei, CN); Megan Hott (Boston, MA)
Assignee: ROGERS CORPORATION
H01F1/344C04B35/2633C04B35/6261C04B35/64C08K3/22C04B2235/3256C04B2235/3274C04B2235/5436C04B2235/6567C04B2235/6583C08K2003/2289C08K2201/01
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Quick Facts
Patent No.
US 12,381,025
App. No.
17/741,746
Granted
Aug 5, 2025
Kind
B2
Abstract

In an aspect, a Co 2 Z-type ferrite comprises oxides of at least Me, Co, Mo, Li, and Fe; wherein Me is at least one of Ba or Sr. In another aspect, the Co 2 Z-type ferrite comprises a Z-type hexaferrite an amount of lithium molybdate. In another aspect, the Co 2 Z-type ferrite has a formula Li 2 MoO 4 ·Ba x Sr 3-x Co 2+y−z Me′ y Me″ z Fe 24-2y-m O 41 , wherein Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; Me″ is at least one of Zn, Mn, or Mg; x is 0 to 3; y is 0 to 1.8; z is 0 to 1.8; and m is −4 to 4. In yet another aspect, a method of making a Co 2 Z-type ferrite comprises milling an initial Co 2 Z-type ferrite and Li 2 MoO 4 to form a mixed ferrite; and calcining the mixed ferrite to form the Co 2 Z-type ferrite.

Claims (32)

1. A Co 2 Z-type ferrite, comprising:

oxides of at least Me, Co, Mo, Li, and Fe;

wherein Me is at least one of Ba or Sr.

2. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite has a formula Li 2 MoO 4 ·Ba x Sr 3-x Co 2+y-z Me′ y Me″ z Fe 24-2y-m O 41 , wherein Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; Me″ is at least one of Zn, Mn, or Mg; x is 0 to 3; y is 0 to 1.8; z is 0 to 1.8; and m is −4 to 4.

3. The Co 2 Z-type ferrite of claim 2 , wherein at least one of

x is 0.1 to 3;

y is 0 to 1.5;

z is 0 to 1.5; or

m is −3 to 4.

4. The Co 2 Z-type ferrite of claim 2 , wherein the Co 2 Z-type ferrite has the formula of Li 2 MoO 4 ·Ba x Sr 3-x Co 2 Fe 24-m O 41 ; wherein x is 0 to 3; wherein m is −4 to 4.

5. The Co 2 Z-type ferrite of claim 2 , wherein the Li 2 MoO 4 is present in an amount of 0.1 to 1 weight percent based on a total weight of the Co 2 Z-type ferrite.

6. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite comprises

a magnetic phase having the formula Ba x Sr 3-x CO 2+y-z Me y Me′ z Fe 24-2y-m O 41 , wherein Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; Me′ is at least one of Zn, Mn, or Mg; x is 0 to 3; y is 0 to 1.8; z is 0 to 1.8; and m is −4 to 4; and

a dielectric phase having the formula Li 2 MoO 4 .

7. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite has a D 50 particle size of 2 to 10 micrometers; or wherein the Co 2 Z-type ferrite has a porosity of 0 to 50 volume percent based on the total volume of the Co 2 Z-type ferrite.

8. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite has a permeability of greater than or equal to 2 at a frequency of 0.5 to 2 gigahertz; or wherein the Co 2 Z-type ferrite has a magnetic loss tangent tan δ μ of less than or equal to 0.3 at a frequency of 0.5 to 2 gigahertz.

9. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite has a permittivity of less than or equal to 8 at a frequency of 0.5 to 2 gigahertz.

10. The Co 2 Z-type ferrite of claim 1 , wherein the Co 2 Z-type ferrite has a dielectric loss tangent tan δ ε of less than or equal to 0.01 at a frequency of 0.5 to 2 gigahertz.

11. A composite comprising a polymer and the Co 2 Z-type ferrite of claim 1 .

12. The composite of claim 11 , wherein the polymer comprises at least one of a fluoropolymer, a polyurethane, a silicone polymer, a liquid crystalline polymer, a polyketone, a polysulfone, or a polyolefin.

13. An article comprising the ferrite composition of claim 1 .

14. The article of claim 13 , wherein the article is an antenna, a filter, an inductor, a circulator, or an EMI suppressor.

15. A method of making the Co 2 Z-type ferrite of claim 1 comprising:

milling an initial Co 2 Z-type ferrite and LiMoO 4 to form a mixed ferrite; and

calcining the mixed ferrite to form the Co 2 Z-type ferrite.

16. The method of claim 15 , wherein the milling occurs for greater than or equal to 1.5 hours; or at a mixing speed of greater than or equal to 300 revolutions per minute.

17. The method of claim 15 , further comprising:

milling ferrite precursor compounds comprising oxides of Me, Co, Me′, Me″, and Fe, to form a magnetic oxide mixture; wherein Me comprises at least one of Ba or Sr; Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; and Me″ is at least one of Zn, Mn, or Mg;

calcining the magnetic oxide mixture in an oxygen or air atmosphere to form the initial Co 2 Z-type ferrite having the formula Ba x Sr 3-x CO 2+y-z Me′ y Me″ z Fe 24-2y-m O 41 , wherein Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; Me″ is at least one of Zn, Mn, or Mg; x is 0 to 3; y is 0 to 1.8; z is 0 to 1.8; and m is −4 to 4.

18. The method of claim 15 , further comprising milling Li 2 CO 3 and MoO 2 to form a dielectric oxide mixture; and calcining the dielectric oxide mixture in an oxygen or air atmosphere to form the Li 2 MoO 4 .

19. The method of claim 15 , wherein the calcining the mixed ferrite occurs at a calcining temperature of 800 to 1,300° C. or for a calcining time of 0.5 to 20 hours.

20. The method of claim 15 , further comprising forming a composite comprising the Co 2 Z-type ferrite and a polymer.

Assignments (2)
SECURITY INTEREST Recorded Mar 24, 2023
From: ROGERS CORPORATION
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 063094/0195 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 12, 2022
From: CHEN, YAJIE; YOUNG, LANCE; LI, QIFAN; HOTT, MEGAN
To: ROGERS CORPORATION
Reel/Frame 059987/0516 →
Continuity (2)
Provisional Application 63189431 · May 17, 2021
Related Publication 20220367093A1 · Nov 17, 2022
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