Adjusting SiO2 : C mole ratios in rice hull ash (RHA) to control carbothermal reduction to nanostructured SiC, Si3N4 or Si2N2O composites

SiO 2 : C mole ratios in RHA are controlled using an unconventional method, by which nanocomposites are synthesized via carbothermal reduction exploiting the intrinsic nanoscale SiO 2 and carbon with no need for adding an external carbon source.