Yttria nanopowders manufactured by the combustion synthesis process of yttrium citrate-urea

A new precursor was obtained by adding urea to the original yttrium citrate precursor. The Y₂O₃ nanopowder was synthesized by the combustion process of both precursors at 500°C, 600°C, 700°C and 800°C, respectively. The synthesis mechanism of the Y₂O₃ nanopowder is discussed based on the results of XRD and TEM. The particle size of the Y₂O₃ nanopowder synthesized by the combustion process of yttrium citrate with urea is finer than that of the Y₂O₃ nanopowder synthesized by the combustion process of yttrium citrate without urea at the same temperature.