PREPARATION OF SPHERICAL ZR0.8SN0.2TIO4 POWDER BY ULTRASONIC SPRAY-PYROLYSIS

Fine, spherical Zr0.8Sn0.2TiO4 powders were prepared by spray pyrolysi s, using an ultrasonic transducer, from an aqueous solution of metal c hlorides. The synthesized powders had a spherical morphology and many shell fragments. The observed shell fragments were attributed to the i mpermeable surface crust formed during thermal decomposition of the dr oplets. The raw materials for the preparation of Zr0.8Sn0.2TiO, were a nalysed prior to any treatments because the properties of the surface crust could be related to those of the raw materials. ZrOCl2 . 8H(2)O was supposed to affect the shell fragments as well. Spherical Zr0.8Sn0 .2TiO4 powders without shell fragments could be prepared using ZrO(CH3 COO)(2) in place of ZrOCl2 . 8H(2)O.