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US 2026/0265147 A1Published application
Dual phased electromagnetic composite ceramic
AssigneeImam Abdulrahman Bin Faisal University
InventorsYassine SLIMANI, Munirah A. ALMESSIERE, Essia HANNACHI, Abdulhadi BAYKAL
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Abstract
A ceramic composite material includes Barium titanate (BaTiO3) and CoFe1.98Nb0.02O4. The BaTiO3 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO3 and the CoFe1.98Nb0.02O4. The CoFe1.98Nb0.02O4 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO3 and the CoFe1.98Nb0.02O4. These composite products may be suitable for high-frequency electromagnetic device applications.
Claims18
1:
- A dual phase ceramic composite material, comprising:
- BaTiO3;
- and
- CoFe1.98Nb0.02O4,
- wherein the BaTiO3 is present in an amount of 1 to 99 percent by weight based on a total weight of the BaTiO3 and the CoFe1.98Nb0.02O4,
- wherein the CoFe1.98Nb0.02O4 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO3 and the CoFe1.98Nb0.02O4,
- wherein the BaTiO3 and the CoFe1.98Nb0.02O4 are each present as single phases and the CoFe1.98Nb0.02O4 phase is present in the BaTiO3 phase, and
- wherein the BaTiO3 phase is dielectric and the CoFe1.98Nb0.02O4 phase is magnetic.
5 more elements
2:
- The material of claim 1, wherein the BaTiO3 is in the form of particles having a crystallite size of 20 to 45 nm.
3:
- The material of claim 2, wherein the BaTiO3 phase has a tetragonal structure.
4:
- The material of claim 1, wherein the CoFe1.98Nb0.02O4 is present in the form of particles having a crystallite size of 5 to 50 nm.
5-6. (canceled)
7:
- The material of claim 1, wherein the BaTiO3 is a cubic phase.
8:
- The material of claim 1, having a porous, irregular granular morphology with an average particle size of 0.1 to 10 μm.
9:
- The material of claim 2, wherein the BaTiO3 phase comprises spherical particles with an average particle diameter of 0.1 to 2 μm.
10:
- The material of claim 4, wherein the CoFe1.98Nb0.02O4 phase comprises rhombic particles with an average particle diameter of 0.5 to 5 μm.
11-12. (canceled)
13:
- The material of claim 1, wherein barium is present in an amount of 10 to 30 mol percent, titanium is present in an amount of 10 to 30 mol percent, oxygen is present in an amount of 40 to 60 mol percent, cobalt is present in an amount of 0.1 to 3 mol percent, iron is present in an amount of 0.1 to 4 mol percent, and niobium is present in an amount of 0.1 to 2 mol percent based on a total number of mols of the barium, titanium, oxygen, cobalt, iron, and niobium.
14:
- The material of claim 1, having a dielectric constant of 1 to 20 at a frequency of 1 to 106 Hz.
15:
- The material of claim 1, having a dielectric loss of 0.1 to 7 at a frequency of 1 to 106 Hz according to ASTM D150.
16:
- The material of claim 1, having a dielectric loss tangent of 0.01 to 1 at a frequency of 1 to 106 Hz.
17:
- The material of claim 1, wherein the BaTiO3 is made by a sol-gel process.
18:
- The material of claim 1, wherein the CoFe1.98Nb0.02O4 is made by a hydrothermal process.
19:
- The material of claim 1, wherein the ceramic composite material is made by a solid-state reaction process.
20:
- A high frequency device, comprising:
- the material of claim 1.