Line-profile analysis of nanostructured ZnO powders obtained by freeze-drying method
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Freeze-drying, as a cryochemical powders processing method is applied in ZnO submicrometar to nanosized powders synthesis. The process involves rapid freezing of the sprayed precursor solution, drying under vacuum by sublimation of the solvent and the salt decomposition to oxide by thermal treatment. The precursor salt for ZnO powder synthesis was Zn(NO3)2·6H2O dissolved in distilled water (1 mol/dm3). The aqueous solution was sprayed by the twin-fluid atomization system, frozen using liquid nitrogen and dehydrated using a freeze-dryer operated at the temperatures from 243 K to 293 K and vacuum from 13 Pa to 20 Pa. A detailed X-ray analysis of the microstructure parameters such as the average crystallite sizes and shapes, crystal lattice microstrains and stacking faults of ZnO produced by thermal decomposition of as prepared Zn(NO3)2 at temperatures of 548 K and 898 K is realized by the pattern decomposition technique. The dependence between microstructural parameters and temperatures ...of thermal decomposition has been established.
Извор:European Powder Diffraction 6: Proceedings of the Sixth European Powder Diffraction Conference, Held August 22-25, 1998 in Budapest, Hungary, 2000, 1068-1073
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Напомена:Materials Science Forum, Volume 321-324