Magnetodielectric y-phase strontium hexagonal ferrite materials formed by sodium substitution

Patent metadata

Field	Value
Publication number	US-2021366634-A1
Application number	US-202117203598-A
Country	US
Kind code	A1
Filing date	Mar 16, 2021
Priority date	Oct 24, 2014
Publication date	Nov 25, 2021
Grant date	—

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, sodium can be added into the crystal structure of the hexagonal ferrite material in order to achieve high resonance frequencies while maintaining high permeability.

First claim

1 . (canceled)

2 . A modified sodium substituted strontium hexagonal ferrite comprising:
a Y-phase strontium hexagonal ferrite crystal structure including elements strontium, sodium, cobalt, iron, oxygen and a trivalent ion, the trivalent ion configured to charge balance for the sodium substituting at least partially for the strontium in the crystal structure.

3 . The modified sodium substituted strontium hexagonal ferrite of claim 2 wherein the crystal structure contains the trivalent ion.

4 . The modified sodium substituted strontium hexagonal ferrite of claim 3 wherein greater than zero and less than or equal to 1.5 of the trivalent ion is included in the crystal structure.

5 . The modified sodium substituted strontium hexagonal ferrite of claim 2 wherein the trivalent ion is selected from the group consisting of Al, Ga, Sc, Cr, Mn, In, Yb, Er, Y and the other lanthanide elements.

6 . The modified sodium substituted strontium hexagonal ferrite of claim 5 wherein the trivalent ion is scandium.

7 . The modified sodium substituted strontium hexagonal ferrite of claim 2 wherein the modified sodium substituted strontium hexagonal ferrite has a composition Sr 1.75 Na 0.25 Co 1.75 M 0.25 Fe 12 O 22 , M being the trivalent ion.

8 . The modified sodium substituted strontium hexagonal ferrite of claim 2 wherein the modified sodium substituted strontium hexagonal ferrite has a composition Sr 1.5 Na 0.5 Co 1.5 M 0.5 Fe 12 O 22 , M being the trivalent ion.

9 . An antenna comprising:
a Y-phase strontium hexagonal ferrite crystal structure including elements strontium, sodium, cobalt, iron, oxygen and a trivalent ion, the trivalent ion configured to charge balance for the sodium substituting at least partially for the strontium in the crystal structure.

10 . The antenna of claim 9 wherein the sodium substituted strontium hexagonal ferrite has a composition Sr 1.75 Na 0.25 Co 1.75 M 0.25 Fe 12 O 22 , M being the trivalent ion.

11 . The antenna of claim 9 wherein the sodium substituted strontium hexagonal ferrite has a composition Sr 1.5 Na 0.5 Co 1.5 M 0.5 Fe 12 O 22 , M being the trivalent ion.

12 . The antenna of claim 9 wherein the trivalent ion is incorporated into the crystal structure, the trivalent ion being scandium.

13 . The antenna of claim 9 wherein the crystal structure contains the trivalent ion and greater than zero and less than or equal to 1.5 of the trivalent ion is included in the crystal structure.

14 . The antenna of claim 9 wherein the trivalent ion is selected from the group consisting of Al, Ga, Sc, Cr, Mn, In, Yb, Er, Y and the other lanthanide elements.

15 . A modified sodium substituted strontium hexagonal ferrite comprising:
a Y-phase strontium hexagonal ferrite crystal structure including elements strontium, sodium, cobalt, iron, oxygen and a tetravalent ion, the tetravalent ion configured to charge balance for the sodium substituting at least partially for the strontium in the crystal structure.

16 . The modified sodium substituted strontium hexagonal ferrite of claim 15 wherein the crystal structure contains the tetravalent ion.

17 . The modified sodium substituted strontium hexagonal ferrite of claim 16 wherein greater than zero and less than or equal to 0.75 of the tetravalent ion is included in the crystal structure.

18 . The modified sodium substituted strontium hexagonal ferrite of claim 15 wherein the tetravalent ion is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

19 . An antenna comprising:
a Y-phase strontium hexagonal ferrite crystal structure including elements strontium, sodium, cobalt, iron, oxygen and a tetravalent ion, the tetravalent ion configured to charge balance for the sodium substituting at least partially for the strontium in the crystal structure.

20 . The antenna of claim 19 wherein the crystal structure contains the tetravalent ion and greater than zero and less than or equal to 0.75 of the tetravalent ion is included in the crystal structure.

21 . The antenna of claim 19 wherein the tetravalent ion is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

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

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title