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Published December 1994 | metadata_only
Journal Article

Synthesis of Yttria Powders by Electrospray Pyrolysis


Electrospray atomization of high-concentration (∼400 g/L) chemical precursor solutions was applied to the synthesis of yttria powders. Conditions were found which led to high-quality powders, composed of dense, spheroidal, submicrometer, and nanocrystalline oxide particles. The precursor solutions were hydrated yttrium nitrates dissolved in n-propyl alcohol at concentrations ranging from 44.1 to 455 g/L. Electrospray atomization produced submicrometer precursor droplets which were dispersed in air and carried through an electric furnace for thermal decomposition at 500°C for several seconds residence time. X-ray powder diffraction patterns indicated the expected cubic phase. Transmission electron micrographs showed that the particle structure varied with solution composition, ranging from hollow, inflated spheres for 6-hydrated nitrates to dense spheroids for 5-hydrated nitrates. The use of 6-hydrated nitrates in the solutions appeared to form particle surfaces which were impermeable to alcohol vapor evolved during thermal decomposition, leading to hollow, inflated spheres.

Additional Information

© 1994 American Ceramic Society. Received August 21, 1992; approved September 27, 1993. Supported by the National Science Foundation under Grants Nos. CBT8813006 and CTS113191 and by GTE Laboratories, Inc., Waltham, MA.

Additional details

August 20, 2023
August 20, 2023