Journal
RARE METALS
Volume 40, Issue 7, Pages 1778-1784Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01544-9
Keywords
Rare earths; Perovskite; Kinetics; Mechanism; Combustion synthesis; Nucleation
Funding
- Russian Science Foundation [16-13-10252]
- Russian Science Foundation [16-13-10252] Funding Source: Russian Science Foundation
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NdCoO3 nanocrystals prepared via glycine-nitrate combustion method and heat treatment rapidly form at 550-600 degrees C with sizes of 7-10 nm, showing good correlation between empirical and experimental data from X-ray diffraction and transmission electron microscopy. The unique nanoporous microstructure and spatial limitations prevent particle growth. The kinetic equation based on Avrami-Erofeev nucleation model correlates well with experimental data, and the apparent activation energy for formation is determined.
NdCoO3 nanocrystals formed via glycine-nitrate combustion method followed by heat treatment has been systematically studied. Formation of NdCoO3 nanocrystals with minimal size of 7-10 nm from X-ray amorphous combustion products has been elucidated to be a very rapid process, occurring at the temperature of 550-600 degrees C for 5-30 min. The comparison of the minimum sizes of NdCoO3 crystallites obtained from the offered empirical relation d(min) = l(unit cell).N(where N is 7-12 and l(unit cell) is elementary cell parameter) and the data determined on the basis of X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed good correlation. The existence of special nanoporous microstructure and spatial limitations prevent NdCoO3 particle growth. The kinetic equation based on Avrami-Erofeev nucleation model was offered to be correlated well with experimental data of fractional conversion (alpha) versus isothermal time (tau). The apparent activation energy (E-a = (338 +/- 32) kJ) of formation of NdCoO3 nanocrystals from X-ray amorphous combustion products obtained in excess of oxidant followed by heat treatment at 550-600 degrees C was determined.
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