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US 11,691,892 B2Granted
Z-type hexaferrite having a nanocrystalline structure
AssigneeRogers Corporation
InventorsYajie Chen, Li Zhang, Shawn Williams
Life of this patent
Estimating the term…
Abstract
In an aspect, a Co2Z ferrite has the formula: (Ba1-xSrx)3Co2+yMyFe24-2y-zO41. M is at least one of Mo, Ir, or Ru. The variable x can be 0 to 0.8, or 0.1 to 0.8. The variable y can be 0 to 0.8, or 0.01 to 0.8. The variable z can be −2 to 2. The Co2Z ferrite can have an average grain size of 5 to 100 nanometers, or 30 to 80, or 10 to 40 nanometers as measured using at least one of transmission electron microscopy, field emission scanning electron microscopy, or x-ray diffraction.
Claims20
A Co2Z ferrite having the formula:
- (Ba1-xSrx)3Co2+yMyFe24-2y-zO41
- wherein M is at least one of Mo, Ir, or Ru;
- x is 0 to 0.8;
- y is 0 to 0.8;
- and z is −2 to 2;
- and
- wherein the Co2Z ferrite has an average grain size of 5 to 100 nanometers as measured using at least one of transmission electron microscopy, field emission scanning electron microscopy, or x-ray diffraction;
- and
- wherein
- y is 0.01 to 0.8, or
- x is 0.1 to 0.8, or
- M is present and is at least one of Ru or Mo, or
- the Co2Z ferrite has a median D50 particle size by volume of 1 to 30 micrometers as measured using Horiba LA-910 laser light scattering PSD analyzer or as determined in accordance with ASTM D4464-15, or
- a combination thereof.
11 more elements
A composite comprising:
- a polymer comprising at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene (PE), high density polyethylene (HDPE), low density polyethylene (LDPE), polymethylmethacrylate (PMMA), polyether ether ketone (PEEK), or polyethersulfone (PES);
- and
- a ferrite composition of having the formula:
- (Ba1-xSrx)3Co2+yMyFe24-2y-zO41
- wherein M is at least one of Mo or Ru;
- x is 0.1 to 0.8;
- y is 0.01 to 0.8;
- and z is −2 to 2;
- and
- wherein the Co2Z ferrite has an average grain size of 5 to 100 nanometers as measured using at least one of transmission electron microscopy, field emission scanning electron microscopy, or x-ray diffraction.
7 more elements
A method of making a Co2Z ferrite comprising:
- milling ferrite precursor compounds comprising Fe, Co, Ba, and M, wherein M is at least one of Mo, Ir, or Ru to form an oxide mixture;
- calcining the oxide mixture in an oxygen or air atmosphere to form a calcined ferrite;
- high energy milling the calcined ferrite at an energy sufficient to form the Co2Z ferrite having a nanocrystalline structure having an average grain size of 5 to 100 nm as measured using at least one of transmission electron microscopy, field emission scanning electron microscopy, or x-ray diffraction.
Dependencies are inferred from the claim text.