Spherical vibrational modes of ZrO₂–CuO nanoparticles

The nano-structural changes in zirconia (ZrO₂) ceramics upon incorporation of different amounts of the Cu²⁺ cations and after thermal treatment of the amorphous precursors were investigated by low frequency Raman spectroscopy (LFRS). The spherical vibrational modes were observed for both – amorphous...

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Bibliographic Details
Published in:Journal of molecular structure 2011-05, Vol.993 (1-3), p.198-202
Main Authors: Mikac, L, Ivanda, M, Štefanić, G, Musić, S, Furić, K, Tonejc, A.M
Format: Article
Language:English
Subjects:
annealing
cations
ceramics
copper
heat treatment
nanocrystals
nanoparticles
particle size
particle size distribution
phase transition
Raman spectroscopy
temperature
transmission electron microscopy
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Summary:The nano-structural changes in zirconia (ZrO₂) ceramics upon incorporation of different amounts of the Cu²⁺ cations and after thermal treatment of the amorphous precursors were investigated by low frequency Raman spectroscopy (LFRS). The spherical vibrational modes were observed for both – amorphous and nanocrystalline ZrO₂–CuO (ZC) particles. The procedure how to determine the particle size distribution from the LFRS modes was described and tested on few ZC samples by comparison with transmission electron microscopy results. The method was used to monitor the particle size growth in dependence on dopant concentration and annealing temperatures. The reduction of the particle size growth with doping, as well as the discontinuity in the particle size growth between 500°C and 600°C was observed. The first effect was interpreted with an increase of defects in nanoparticles with doping, and the second one by the phase transition from tetragonal to monoclinic phase of ZC particles.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2011.02.032