Open AccessKinetics of nanocrystalline phase transformations in spray pyrolysed ZnO particles
Author(s) -
Lidija Mančić,
Zorica V. Marinković,
Olivera Milošević
Publication year - 2002
Publication title -
journal of mining and metallurgy. section b, metallurgy/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 , materials science , crystallite , differential scanning calorimetry , nucleation , isothermal process , chemical engineering , phase (matter) , exothermic reaction , analytical chemistry (journal) , atmospheric temperature range , 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