Method of synthesizing high surface area unagglomerated...

Details Method of synthesizing high surface area unagglomerated... Method of synthesizing high surface area unagglomerated...

C - Chemistry, Metallurgy

01

G

319/15, 23/224

C01G 55/00 (2006.01) H01M 4/48 (2006.01)

Patent

CA 1193420

ABSTRACT OF THE DISCLOSURE Electrically conductive pyrochlore compounds of high surface area and unagglomerated form having the formula A2[B2-xAx]O7-Y may be prepared wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, O < x ? 1.0 and O ? y ? 1. The method involves (1) synthesizing the pyrochlores in an aqueous alkaline reaction medium having a pH of at least about 12.0 and in the presence of an oxygen source (2) displacing the reaction medium with water, (3) atomizing the resultant slurry and (4) freeze drying the resultant product. The pyrochlore compounds thus prepared have a variety of applications including use as oxygen electrodes in electro-chemical devices.

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