Increased resonant frequency potassium-doped hexagonal ferrite

Patent metadata

Field	Value
Publication number	US-2018374616-A1
Application number	US-201816025726-A
Country	US
Kind code	A1
Filing date	Jul 2, 2018
Priority date	Oct 24, 2014
Publication date	Dec 27, 2018
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, strontium can be substituted out for a trivalent or tetravalent ion composition including potassium, thereby providing for advantageous properties.

First claim

1 - 20 . (canceled)

21 . A method of forming a strontium-potassium ceramic material comprising:
adding potassium as an excess material into Sr 2 Co 2 Fe 12 O 22 ; adding a trivalent ion as an excess material into the Sr 2 Co 2 Fe 12 O 22 ; and sintering the trivalent ion, the potassium, and the Sr 2 Co 2 Fe 12 O 22 together, the potassium and the trivalent ion substituting at least some of the cobalt and the strontium of the Sr 2 Co 2 Fe 12 O 22 .

22 . The method of claim 21 , wherein the trivalent ion is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, Er, Y, and lanthanide ions.

23 . The method of claim 21 , wherein a same amount of the potassium and the trivalent ion are added into the Sr 2 Co 2 Fe 12 O 22 .

24 . The method of claim 23 , wherein between 0 and 1.5 units of the potassium and the trivalent ion are added into the Sr 2 Co 2 Fe 12 O 2 .

25 . The method of claim 23 , wherein between 0.2 and 0.7 units of the potassium and the trivalent ion are added into the Sr 2 Co 2 Fe 12 O 2 .

26 . The method of claim 21 , wherein the trivalent ion is scandium and 0.25 units of the potassium and the scandium are added into the Sr 2 Co 2 Fe 12 O 2 .

27 . The method of claim 21 , wherein the trivalent ion is indium and 0.25 units of the potassium and the indium are added into the Sr 2 Co 2 Fe 12 O 2 .

28 . The method of claim 21 , wherein the trivalent ion is scandium and 0.5 units of the potassium and the scandium are added into the Sr 2 Co 2 Fe 12 O 2 .

29 . A method of forming a strontium-potassium ceramic material comprising:
adding potassium as an excess material into Sr 2 Co 2 Fe 12 O 22 ; adding a tetravalent ion as an excess material into the Sr 2 Co 2 Fe 12 O 22 ; and sintering the tetravalent ion, the potassium, and the Sr 2 Co 2 Fe 12 O 22 together, the potassium and the tetravalent ion substituting at least some of the cobalt and the strontium of the Sr 2 Co 2 Fe 12 O 22 .

30 . The method of claim 29 , wherein the tetravalent ion is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

31 . The method of claim 29 , wherein twice as much of the tetravalent ion is added into the Sr 2 Co 2 Fe 12 O 22 as the potassium.

32 . The method of claim 29 , wherein between 0 and 0.75 units of the potassium and the tetravalent ion are added into the Sr 2 Co 2 Fe 12 O 2 .

33 . The method of claim 29 , wherein between 0.2 and 0.5 units of the potassium and the tetravalent ion are added into the Sr 2 Co 2 Fe 12 O 2 .

34 . A strontium-potassium ceramic material comprising:
a y-phase hexagonal ferrite material with a starting composition of Sr 2 Co 2 Fe 12 O 2 , the y-phase hexagonal ferrite material being modified to include potassium and a charge balancing ion, at least some of the strontium and the cobalt in the y-phase hexagonal ferrite material being replaced by the potassium and the charge balancing ion to form the strontium-potassium ceramic material.

35 . The strontium-potassium ceramic material of claim 34 wherein the balancing ion is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, Er, Y, and lanthanide ions.

36 . The strontium-potassium ceramic material of claim 34 wherein the balancing ion is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

37 . The strontium-potassium ceramic material of claim 34 wherein the strontium- potassium ceramic material has a composition selected form the group consisting of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 , Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 , Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 , and Sr 1.5 K 0.5 Co 1.5 Sc 0.5 Fe 12 O 22 .

38 . A radiofrequency component formed from the strontium-potassium ceramic material of claim 34 .

39 . A circulator formed from the strontium-potassium ceramic material of claim 34 .

40 . An antenna formed from the strontium-potassium ceramic material of claim 34 .

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

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• C04B35/2633

  containing barium, strontium or calcium · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title