Composite ceramics with low dielectric losses

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 a BaTiO3 phase is present as a single phase with 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:

• The material of claim 4, wherein a CoFe1.98Nb0.02O4 phase is present as a single phase.

6:

• The material of claim 1, wherein the BaTiO3 and the CoFe1.98Nb0.02O4 are present as separate phases.

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 a BaTiO3 phase comprises spherical particles with an average particle diameter of 0.1 to 2 μm.

10:

• The material of claim 4, wherein a CoFe1.98Nb0.02O4 phase comprises rhombic particles with an average particle diameter of 0.5 to 5 μm.

11:

• The material of claim 1, wherein the ceramic composite material has one or more regions of a BaTiO3 phase and one or more regions of a CoFe1.98Nb0.02O4 phase.

12:

• The material of claim 1, wherein the ceramic composite material is biphasic comprising a dielectric BaTiO3 phase and a magnetic CoFe1.98Nb0.02O4 phase.

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 CoFe1.98Nb002O4 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.