Kinetics of nanocrystalline phase transformations in spray pyrolysed ZnO particles | Zendy

Lidija Mančić | Zendy; Zorica Marinkovic | Zendy; O. Milošević | Zendy

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Kinetics of nanocrystalline phase transformations in spray pyrolysed ZnO particles

Author(s) -

Lidija Mančić,

Zorica Marinkovic,

O. Milošević

Publication year - 2002

Publication title -

journal of mining and metallurgy section b metallurgy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.42

H-Index - 20

eISSN - 2217-7175

pISSN - 1450-5339

DOI - 10.2298/jmmb0204179m

Subject(s) - nanocrystalline material , crystallite , materials science , differential scanning calorimetry , nucleation , chemical engineering , isothermal process , phase (matter) , exothermic reaction , atmospheric temperature range , analytical chemistry (journal) , nanotechnology , metallurgy , chemistry , thermodynamics , chromatography , organic chemistry , physics , engineering

The thermal behavior of ZnO powder obtained by ultrasonic spray pyrolysis of nitrate solution (c=0.8mol/dm3, D0=2.695µm, Tmax=6000C, FG=1.2dm3/min) was investigated using non-isothermal differential scanning calorimetry (DSC, heating rates 5, 10, 15, 20O/min). The exothermic heat effects at the temperature range from 350 to 5000C were linked to particles structural data obtained by XRD, SEM and TEM analysis. Produced particles are characterized by uniform submicronic size (D=800nm, BET=4.94m2/g), high phase purity and granular or circular “open” surface due to the presence of primary crystallites (d= 20nm). Observed structural changes during heating of this powder were attributed to simultaneous processes of nucleation and growth of primary crystallites inside the produced particles

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