A.L. Vereshchagin, O.B. Kudryashova, E.A. Morozova, N.V. Bychin, A.N. Pasedkina
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Abstract: Lead iodide was formed by dosing 0.02 M KI solution into an equivalent amount of 0.01 M Pb (CH3COO) 2 at room temperature (with the addition of acetic acid) and under ultrasonic irradiation with an intensity of 8 or 16 W / cm2. It was found that the morphology of PbI2 particles formed under ultrasonic irradiation is determined by the pH of the medium. At pH 2.8 ... 2.9, there is an increase in the particle size as a result of welding due to the collision of particles. Scanning electron microscopy revealed traces of particle fusion and impact traces. At pH 4.5 ... 4.6, the particles are dispersed due to sonohydrolysis and the formation of PbI (OH). The morphology of the resulting particles also depends on the method of production: when dosing potassium iodide into a solution of lead acetate, star-shaped structures are formed, during recrystallization, hexagonal plates are formed, in all cases about 10 μm in size
Index terms: lead iodide, sonocrystallization, sonohydrolysis, particle morphology, optical microscopy, scanning electron microscopy, particle size, X-ray phase analysis


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