Synthesis of Bi₂O₃ in ultrasound field of 750-1000W intensity was studied. a phase of Bi₂O₃ was formed in the following three steps: 1. formation of Bi(OH)₃ by precipitation reaction of bismuth nitrate and amonium hydroxide; 2. condensation of Bi-OH groups and formation of Bi-O-Bi bonds and 3. hydroxid was transformed through oxid-hydroxid semiproduct into crystalline a-Bi₂O₃.

The crystallization speed increased with time and ultrasound intensity. Ultrasound field speeded up Bi-OH condensation, a-Bi₂O₃ crystallization and a-Bi₂O₃ crystal growth.

Particle size of sonochemically prepared a-Bi₂O₃ was in range of 0,05-5mm, which corresponded to specific surface area of 0,5-17m²/g. The influence of polyethyleneglycole as a chelating agent on particle size is shown.

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