Y-type hexaferrite, method of manufacture, and uses thereof

Patent metadata

Field	Value
Publication number	US-2024203624-A1
Application number	US-202318509451-A
Country	US
Kind code	A1
Filing date	Nov 15, 2023
Priority date	Nov 28, 2022
Publication date	Jun 20, 2024
Grant date	—

Abstract

A NiHf- or NiTi-doped Co2Y-type ferrite, having a formula ofBan-xSrxCo2-yCuyNizHfzFe(m-2z)O22orBan-xSrxCo2-yCuyNizTizFe(m-2z)O22wherein 2≤n≤2.4. 0≤x≤1, 0.1≤y≤1, 0<z≤2, and 10≤m≤13.

First claim

What is claimed is:

1 . A NiHf- or NiTi-doped Co 2 Y-type ferrite, having a formula of
Ba n-x Sr x Co 2-y Cu y Ni z Hf z Fe (m-2z) O 22
or
Ba n-x Sr x Co 2-y Cu y Ni z Ti z Fe (m-2z) O 22
wherein
2≤n≤2.4,
0≤x≤1,
0.1≤y≤1,
0<z≤2, and
10≤m≤13.

2 . The NiHf-doped Co 2 Y-type ferrite of claim 1 , having the formula of
Ba n-x Sr x Co 2-y Cu y Ni z Hf 2 Fe (m-2z) O 22 .

3 . The NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 , wherein
x=0, and 0.1≤z≤2.

4 . The NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 3 , wherein
n=2.1, y=0.4, 0.2≤z≤0.8, and m=11.7.

5 . The NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 , having
a magnetic permeability (μ′) of 1.5 to 2.5 at a frequency of 0.5 to 3 GHz; a magnetic loss tangent (tan δ μ ) of 0.02 to 0.08 at a frequency of 0.5 to 3 GHz; a permittivity (ε′) of 4.7 to 7.5 at a frequency of 0.5 to 3 GHz; a dielectric loss tangent (tan δ ε ) of 0.0006 to 0.006 at a frequency of 0.5 to 3 GHz; or a combination of the foregoing.

6 . The NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 , having
a magnetic permeability (μ′) of 1.5 to 2.5 at a frequency of 0.5 to 3 GHz; a magnetic loss tangent (tan δ μ ) of 0.02 to 0.08 at a frequency of 0.5 to 3 GHz; a permittivity (ε′) of 4.7 to 7.5 at a frequency of 0.5 to 3 GHz; and a dielectric loss tangent (tan δ ε ) of 0.0006 to 0.006 at a frequency of 0.5 to 3 GHz.

7 . The NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 , having a porosity of 20 to 50 volume percent, based on a total volume of the NiHf- or NiTi-doped Co 2 Y-type ferrite.

8 . A composite comprising:
a polymer; and the NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 .

9 . The composite of claim 8 , wherein the polymer comprises a polytetrafluoroethylene, a polyethylene, a polypropylene, polyolefin, a polyurethane, a silicone polymer, a liquid crystalline polymer, a poly(ether ether ketone), a poly(phenylene sulfide), or a combination thereof.

10 . The composite of claim 9 , wherein the polymer comprises a polytetrafluoroethylene or a poly(phenylene sulfide).

11 . An article comprising the NiHf- or NiTi-doped Co 2 Y-type ferrite of claim 1 .

12 . The article of claim 11 , wherein the article is an antenna.

13 . A method of making a NiHf- or NiTi-doped Co 2 Y-type ferrite comprising:
milling ferrite precursor compounds comprising oxides of Ba, Co, Cu, Ni, Fe, and either Hf or Ti to form a magnetic oxide mixture; and calcining the magnetic oxide mixture in an oxygen or air atmosphere to form the NiHf- or NiTi-doped Co 2 Y-type ferrite.

14 . The method of claim 12 , wherein the NiHf- or NiTi-doped Co 2 Y-type ferrite has a formula of
Ba n-x Sr x Co 2-y Cu y Ni z Hf z Fe (m-2z) O 22
or
Ba n-x Sr x Co 2-y Cu y Ni z Ti z Fe (m-2z) O 22
wherein
2≤n≤2.4,
0≤x≤1,
0.1≤y≤1,
0<z≤2, and
10≤m≤13.

15 . The method of claim 14 , wherein the NiHf-doped Co 2 Y-type ferrite has the formula of
Ba n-x Sr x Co 2-y Cu y Ni z Hf 2 Fe (m-2z) O 22 .

16 . The method of claim 13 , further comprising:
reducing particle size of the magnetic oxide mixture following calcination to obtain particles; granulating a mixture of the particles and a binder to obtain granules; compressing granules into a green body; and sintering the green body to form the NiHf- or NiTi-doped Co 2 Y-type ferrite.

17 . The method of claim 13 , further comprising forming a composite comprising the NiHf- or NiTi-doped Co 2 Y-type ferrite and a polymer.

Assignees

• Rogers Corp

Inventors

• Chen Yajie
• Young Lance

Classifications

• H01Q1/364

  using a particular conducting material, e.g. superconductor · CPC title

• C08K2201/01

  Magnetic additives · CPC title

• C08K2003/2293

  of nickel · CPC title

• C08K2003/2289

  of cobalt · CPC title

• C08K3/22

  of metals · CPC title