	US 11,691,892 B2
	Z-type hexaferrite having a nanocrystalline structure
Yajie Chen, Andover, MA (US); Li Zhang, Suzhou (CN); and Shawn Williams, Burlington, MA (US)
Assigned to ROGERS CORPORATION, Chandler, AZ (US)
Filed by ROGERS CORPORATION, Chandler, AZ (US)
Filed on Feb. 3, 2021, as Appl. No. 17/166,352.
Claims priority of provisional application 62/979,526, filed on Feb. 21, 2020.
Prior Publication US 2021/0261433 A1, Aug. 26, 2021
Int. Cl. H01F 1/34 (2006.01); H01F 1/11 (2006.01); C01G 51/00 (2006.01); C04B 35/26 (2006.01); C08K 3/22 (2006.01)

CPC C01G 51/66 (2013.01) [C08K 3/22 (2013.01); H01F 1/348 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); C08K 2003/2265 (2013.01); C08K 2201/001 (2013.01); C08K 2201/005 (2013.01); C08K 2201/01 (2013.01); C08K 2201/011 (2013.01)]

20 Claims

1. A Co₂Z ferrite having the formula:

(Ba_1-xSr_x)₃Co_2+yM_yFe_24-2y-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.