| abstract |
The invention relates to a spray pyrolytic process for the preparation of multi-element metal oxide powders useful as precursors of high temperature superconductor ceramics. Aerosols of aqueous solutions containing corresponding metal salts admixed in the required stoichiometric proportion are sprayed through an independently operated hydrogen/oxygen flame in such a way that a flame temperature of 800-1100 °C is maintained. Any contact of the aerosols and powders generated during the process with carbon or carbon-containing compounds or materials is strictly avoided. |