The present invention relates to a method for producing inorganic oxide particles from a precursor material or mixture under combustion synthesis and compositions thereof. The combustion synthesis method is low-cost, low tech, and energy efficient. The combustion synthesized inorganic oxide particles of the method are smaller and exhibits a lower band gap than commercially available specimen of the same chemical composition.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The U.S. Government has in part a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Grant No. DE-FG02-04ER15623 awarded by the Department of Energy.