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Solid State Reactions in Cr2O3-ZnO Nanoparticles Synthesized by Triethanolamine Chemical Precipitation

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DOI: 10.4236/msa.2011.211212    5,595 Downloads   10,393 Views   Citations

ABSTRACT

The present work reports the preliminary results about solid state reactions of Cr-ZnO solid solutions and ZnCr2O4 nanometric particles obtained with triethanolamine (TEA). Different compositions were prepared from 0.65 to 33.3 at % chromium, the last one corresponding to ZnCr2O4 cubic spinel composition. Fourier Transform Infrared Spectroscopy (FTIR) together with X-ray diffraction (XRD) patterns of powders with Cr3+ between 0.65 and 16.0 at % were assigned to Cr-ZnO solid solution due to the only presence of ZnO structure, FTIR spectra indicating that Cr-O bonding exists even if there was no presence of ZnCr2O4. With low chromium atomic percent, lattice parameters increase, but as the chromium content exceeds of 3 at %, there is basically no further expansion of the cell. From Williamson-Hall and Rietveld methods the lattice dimensions were assigned to chromium incorporation in ZnO structure and the lattice contraction by particle size refinement. After annealing all samples from 0.65 to 16.0 at % at 400°C in oxygen, the analysis showed that nanoparticles of Cr-ZnO solid solution still remain.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

I. Esparza, M. Paredes, R. Martinez, A. Gaona-Couto, G. Sanchez-Loredo, L. Flores-Velez and O. Dominguez, "Solid State Reactions in Cr2O3-ZnO Nanoparticles Synthesized by Triethanolamine Chemical Precipitation," Materials Sciences and Applications, Vol. 2 No. 11, 2011, pp. 1584-1592. doi: 10.4236/msa.2011.211212.

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