Granted Patent
B2
US 12,749,604 · App. 17/923,125 · Granted Sep 29, 2026
M-type hexaferrite comprising a low dielectric loss ceramic
Assignee:
ROGERS CORPORATION
H01F1/344C04B35/2633C04B35/6262C04B35/63416C04B35/64C04B2235/3206C04B2235/3236C04B2235/3274C04B2235/3277C04B2235/442C04B2235/6567C04B2235/662C04B2235/786
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Abstract
In an aspect, an M-type ferrite, comprises oxides of Me, Me′, Me″, Co, Ti, and Fe; wherein Me is at least one of Ba, Sr, or Pb; Me′ is at least one of Ti, Zr, Ru, or Ir; and Me″ is at least one of Mg or Ca. In another aspect, a method of making an M-type ferrite comprises milling ferrite precursor compounds comprising oxides of at least Co, Fe, Ti, Me, Me′, and Me″, to form an oxide mixture; wherein Me comprises at least one of Ba, Sr, or Pb; Me′ is at least one of Ti, Zr, Ru, or Ir; and Me″ is at least one of Mg or Ca; and calcining the oxide mixture in an oxygen or air atmosphere to form the M-type ferrite.
Claims (33)
1 . An M-type ferrite, comprising:
a magnetic phase having the formula
MeCo x Me′ x Fe 12-2x O 19 ,
wherein Me is at least one of Ba, Sr, or Pb,
Me′ is at least one of Ti, Zr, Ru, or Ir, and
x is 0, 1 to 2, and
a dielectric phase having the formula Me″TiO 3 , wherein Me″ is at least one of Me or Ca.
2 . The M-type ferrite of claim 1 , wherein Me″ is Mg.
3 . The M-type ferrite of claim 2 , wherein the magnetic phase has the formula of BaCo x Ti x Fe 12-2x O 19 .
4 . The M-type ferrite of claim 2 , wherein x is 0.1 to 1.3.
5 . The M-type ferrite of any of claim 2 , wherein a mole ratio of the magnetic phase to the dielectric phase is 1:0.005 to 1:0.15.
6 . The M-type ferrite of claim 1 , wherein the M-type ferrite is in the form of at least one of a solid-solution or a bi-phase.
7 . The M-type ferrite of claim 1 , wherein the M-type ferrite has an average grain size is of 1 to 100 micrometers, as measured using transmission electron microscopy or field emission scanning electron microscopy.
8 . The M-type ferrite of claim 5 , wherein the M-type ferrite has a permeability of greater than or equal to 30 at a frequency of 200 megahertz.
9 . The M-type ferrite of claim 5 , wherein the M-type ferrite has a figure of merit of greater than or equal to 50 at a frequency of 200 megahertz.
10 . The M-type ferrite of claim 5 , wherein the M-type ferrite has a magnetic loss tangent tan δ μ of less than or equal to 0.8 at a frequency of 200 megahertz.
11 . The M-type ferrite of claim 5 , wherein the M-type ferrite has a Snoek product of greater than or equal to 5 gigahertz at over the frequency range of 1 to 300 megahertz.
12 . A composite comprising a polymer and the M-type ferrite of claim 1 .
13 . The composite of claim 12 , wherein the polymer comprises at least one of a fluoropolymer or a polyolefin.
14 . An article comprising the ferrite composition of claim 1 .
15 . The article of claim 14 , wherein the article is an antenna, a filter, an inductor, a circulator, or an EMI suppressor.
16 . A method of making the M-type ferrite of claim 1 comprising:
milling ferrite precursor compounds comprising oxides of at least Co, Fe, Ti, Me, Me′, and Me″, to form an oxide mixture; and
calcining the oxide mixture in an oxygen or air atmosphere to form the M-type ferrite.
17 . The method of claim 16 , wherein the milling the ferrite precursor compounds comprises:
milling the ferrite precursor compounds comprising oxides of at least Co, Fe, Me, and Me′ to form a first oxide mixture; and
milling the ferrite precursor compounds comprising oxides of at least Ti and Me″ to form a second oxide mixture;
wherein the calcining comprises separately calcining the first oxide mixture and the second oxide mixture or calcining a mixture comprising the first oxide mixture and the second oxide mixture.
18 . The method of claim 17 , wherein the calcining comprises separately calcining the first oxide mixture and the second oxide mixture to form separately calcined mixtures; and the method further comprises mixing the separately calcined mixture to form the M-type ferrite.
19 . The method of claim 16 , wherein the milling occurs for greater than or equal to 4 hours; or at a mixing speed of greater than or equal to 300 revolutions per minute.
20 . The method of claim 16 , further comprising post-annealing the M-type ferrite in an oxygen or air atmosphere after the milling; wherein the post-annealing occurs at an annealing temperature of 900 to 1,275° C. for an annealing time of 1 to 20 hours.
21 . The method of claim 16 , wherein the calcining the oxide mixture occurs at a calcining temperature of 800 to 1,300° C. for a calcining time of 0.5 to 20 hours.
22 . The method of claim 16 , further comprising forming a composite comprising the M-type ferrite and a polymer.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Dec 9, 2022
From: CHEN, YAJIE; WANG, YU
To: ROGERS CORPORATION
Reel/Frame 062043/0581 →
Continuity (2)
Provisional Application
63023303
· May 12, 2020
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