Method for producing heat-resisting compound oxides

A method for producing a heat-resisting compound oxide, comprising:

• synthesizing first oxide particles or their precursor particles in micelles in a microemulsion;
• charging said first oxide particles or their precursor particles to a potential inverse to that of second oxide particles or their precursor particles, wherein said second oxide particles or their precursor particles have a smaller diameter than said first oxide particles or their precursor particles;
• absorbing said second oxide particles or their precursor particles onto said first oxide particles or their precursor particles;
• and
• sintering said first oxide particles or their precursor particles and said second oxide particles or their precursor particles;
• wherein the method results in said second oxide particles being carried on said first oxide particles;
• wherein the obtained surface area is enlarged by the second oxide particles blocking or suppressing the sintering of the first oxide particles.