Material comprising two different non-metallic parrticles having different particle sizes for use in solar reactor

1. A composite particle comprising:

a first non-metallic particle in which is dispersed a second non-metallic particle, where the first non-metallic particle and the second non-metallic particle are inorganic; and where a chemical composition of the first non-metallic particle is different from a chemical composition of the second non-metallic particle; and where the first non-metallic particle and the second non-metallic particle are metal oxides, metal carbides, metal nitrides, metal borides, metal silicides, metal oxycarbides, metal oxynitrides, metal boronitrides, metal carbonitrides, metal borocarbides, or a combination thereof; where the first non-metallic particle has an average particle size of about 20 to about 80 micrometers, and where the second non-metallic particle has an average particle size of about 0.5 to about 10 micrometers prior to a sintering.

2. The composite particle of claim 1 , further comprising a third non-metallic derivative that is formed from the first non-metallic particle and the second non-metallic particle during a sintering process that comprises sintering the first non-metallic particle and the second non-metallic particle to a temperature that is within ±150° C. of a melting point of the lower melting particle of the first non-metallic particle and the second non-metallic particle.

3. The composite particle of claim 1 , where the composite particle has an average particle size of about 200 to about 2000 micrometers.

4. The composite particle of claim 1 , where a weight ratio of the first non-metallic particle to the second non-metallic particle is about 1:4 to about 1:6.

5. The composite particle of claim 1 , where the first non-metallic particle comprises magnetite.

6. The composite particle of claim 1 , where the second non-metallic particle comprises zirconia.

7. The composite particle of claim 1 , having a surface area of greater than or equal to about 100 square meter per gram.

8. A method comprising:

mixing a first non-metallic particle with a second non-metallic particle to produce a homogeneous mixture;

sintering the homogenous mixture to a temperature that is within ±150° C. of a melting point of a lower melting particle selected from the first non-metallic particle and the second non-metallic particle; where the sintering produces a sintered composite; and

crushing the sintered composite to form particulates.

9. The method of claim 8 , further comprising sieving the particulates.

10. The method of claim 9 , further comprising disposing the particulates in a reactor.

11. The method of claim 10 , where the reactor is a solar reactor.

12. The method of claim 9 , where a redox reaction is conducted in the reactor.