Synthesis of the Monoclinic Yttria by Thermal Plasma Processing

摘要

Submicron powders of monoclinic yttria were prepared by thermal plasma processing of commercial yttria powder. The starting yttria powder was vaporized in the hot tail flame of a thermal argon plasma and the resulting vapor was quenched with hydrogen gas to form yttria particles with a 21-nm mean diameter. The synthesis of yttria by oxidizing yttrium carbide in the plasma was also examined. The plasma powders were characterized by powder x-ray diffraction, transmission electron microscopy, and differential thermal analysis. 13 refs., 4 figs., 4 tabs. (ERA citation 13:001230)