Increased resonant frequency potassium-doped hexagonal ferrite

Patent metadata

Field	Value
Publication number	US-11164689-B2
Application number	US-201816025726-A
Country	US
Kind code	B2
Filing date	Jul 2, 2018
Priority date	Oct 24, 2014
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

Disclosed herein are embodiments of an enhanced resonant frequency hexagonal ferrite material and methods of manufacturing. The hexagonal ferrite material can be Y-phase strontium hexagonal ferrite material. In some embodiments, strontium can be substituted out for a trivalent or tetravalent ion composition including potassium, thereby providing for advantageous properties.

First claim

What is claimed is:

1. A method of doping a Y-phase hexagonal ferrite material, the method comprising:
identifying a Y-phase hexagonal ferrite material having a composition Sr 2 Co 2x Fe 12 O 22 ;
substituting at least some strontium of the Y-phase hexagonal ferrite material with potassium; and
substituting at least some cobalt of the Y-phase hexagonal ferrite material with a trivalent ion, the substituting of the potassium and the trivalent ion forming a doped Y-phase hexagonal ferrite material having a composition Sr 2-x K x Co 2-x M x Fe 12 O 22 , M being the trivalent ion and the value of x being 0<x≤1.5.

2. The method of claim 1 wherein M is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, and any of the lanthanide ions.

3. The method of claim 1 wherein 0.2<x<0.7.

4. The method of claim 1 wherein the potassium comes from potassium carbonate.

5. The method of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 .

6. The method of claim 5 wherein a loss factor of the doped Y-phase hexagonal material is below 0.5 at 1 GHz.

7. The method of claim 5 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.

8. The method of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.5 Co 1.5 Sc 0.5 Fe 12 O 22 .

9. The method of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 .

10. The method of claim 9 wherein a loss factor of the doped Y-phase hexagonal material is below 0.5 at 1 GHz.

11. The method of claim 9 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.

12. The method of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

13. The method of claim 1 wherein the doped Y-phase hexagonal material has a loss factor of approximately 1 at 1 GHz.

14. A method of doping a Y-phase hexagonal ferrite material, the method comprising:
identifying a Y-phase hexagonal ferrite material having a composition Sr 2 Co 2 Fe 12 O 22 ;
substituting at least some strontium of the Y-phase hexagonal ferrite material with potassium; and
substituting at least some cobalt of the Y-phase hexagonal ferrite material with a tetravalent ion, the substituting of the potassium and the tetravalent ion forming a doped Y-phase hexagonal ferrite material having a composition Sr 2-2x K 2x Co 2-x N x Fe 12 O 22 , N being the tetravalent ion and the value of x being 0<x≤0.75.

15. The method of claim 14 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

16. The method of claim 14 wherein N is Ge.

17. The method of claim 14 wherein 0.2<x<0.5.

18. The method of claim 14 wherein the potassium comes from potassium carbonate.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David

Classifications

• C04B35/2683

  Other ferrites containing alkaline earth metals or lead · CPC title

• C04B35/26

  based on ferrites · CPC title

• H01F1/348 Primary

  Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure · CPC title

• H01F1/10

  non-metallic substances, e.g. ferrites {, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure} · CPC title

• C04B2235/3217

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