PRODUCTION OF YTTRIUM OXIDE FINE POWDER

摘要

PROBLEM TO BE SOLVED: To obtain a yttrium fine powder excellent in sintering property, reactivity and dispersing property and suitable as a sintering raw material, a sintering assistant, a phosphor raw material, a catalyst or the like. ;SOLUTION: The yttrium oxide fine powder having 0.01-0.2μm primary particle diameter is produced by neutralizing an acidic base aq. solution of yttrium with a carbonate-containing basic salt aq. solution to ≥pH4 and to equal to or below a value generating a plate like crystal to precipitate yttrium carbonate, aging for ≥10hr while mixing at ≤50°C and firing the yttrium carbonate at 700-1300°C. The yttrium oxide fine powder fine in primary particle diameter, free from aggregated particle and having high quality is obtained.;COPYRIGHT: (C)1997,JPO