Synthesis of Homogeneous La0.8Sr0.2CrO3Powders Using an Ultrasonic Spray Pyrolysis Method

A process to synthesize La 0.8 Sr 0.2 CrO₃ (LSC), which is a promising material for use as a separator in a soild oxide fuel cell, is investigated in this study. LSC powders without secondary phases could be synthesized with ultrasonic spray pyrolysis and a heat treatment at 1200℃ for 20 h; however, it showed an average diameter of 0.6 ㎛ with a wide particle size distribution. On the other hand, LSC powders synthesized with spray pyrolysis at 800℃, heat-treated at 900℃ for 5 h, ball-milled and finally heat-treated again at 1200℃ for 20 h showed a smaller average diameter of 0.3 ㎛ and narrower size distribution. Very few particles above 0.5 ㎛ were found. Thus, a proper combination of the heat treatment and milling process after spray pyrolysis it determined to be very important in synthesizing fine and uniform LSC perovskite powders.