Abstract
Submicrometre, highly pure and dense PbO particles were synthesized by pyrolysis of a spray of a lead nitrate, Pb(NO3)2 solution generated by an ultrasonic transducer in a tubular-flow reactor at 300–800 °C and at various carrier gas flow rates. The produced particles were non-agglomerated, non-porous, and mainly tetragonal PbO above 500 °C. Below this temperature, the conversion could not be completed. The high purity, completely densified particles could be obtained at high gas flow rates. The observed particle yields higher than 90%, indicated the high efficiency of this process. Preheating of the mist before the pyrolysis stage was found to be necessary for densification of the particles. Experiments indicated that the spray was dried at the end of the preheating stage forming dense and non-porous Pb(NO3)2 particles. These non-porous particles decomposed and shrunk to PbO particles without any particle bursting into pieceS. Therefore, it was concluded that the decomposition occurred through the liquid phase allowing the evolution of gaseous reaction products by bubbling.
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