Strain and Grain Size Determination of CeO2 and TiO2 Nanoparticles: Comparing Integral Breadth Methods Versus Rietveld, μ-Raman, and TEM
| Autor: | Yamerson Canchanya-Huaman, Juan A. Ramos-Guivar, Angie F. Mayta-Armas, Jemina Pomalaya-Velasco, J A Guerra, Yéssica Bendezú-Roca |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Anatase Materials science General Chemical Engineering CeO2 Crystallite size Strain TEM TiO2 X-ray diffraction µ-Raman Analytical chemistry symbols.namesake Condensed Matter::Materials Science strain General Materials Science Anisotropy QD1-999 crystallite size purl.org/pe-repo/ocde/ford#2.10.01 [https] μ-Raman Resolution (electron density) Grain size Chemistry symbols Crystallite Deformation (engineering) Raman spectroscopy |
| Zdroj: | Nanomaterials Volume 11 Issue 9 Nanomaterials, Vol 11, Iss 2311, p 2311 (2021) CONCYTEC-Institucional Consejo Nacional de Ciencia Tecnología e Innovación Tecnológica instacron:CONCYTEC |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano11092311 |
| Popis: | Various crystallite size estimation methods were used to analyze X-ray diffractograms of spherical cerium dioxide and titanium dioxide anatase nanoparticles aiming to evaluate their reliability and limitations. The microstructural parameters were estimated from several integral breadth methods such as Scherrer, Monshi, Williamson–Hall, and their variants: (i) uniform deformation model, (ii) uniform strain deformation model, and (iii) uniform deformation energy density model. We also employed the size–strain plot and Halder–Wagner method. For this purpose, an instrumental resolution function of an Al2O3 standard was used to subtract the instrumental broadening to estimate the crystallite sizes and strain, and the linear regression analysis was used to compare all the models based on the coefficient of determination. The Rietveld whole powder pattern decomposition method was introduced for comparison purposes, being the best candidate to fit the X-ray diffraction data of metal-oxide nanoparticles. Refined microstructural parameters were obtained using the anisotropic spherical harmonic size approach and correlated with the above estimation methods and transmission electron microscopy images. In addition, µ-Raman spectra were recorded for each material, estimating the mean crystallite size for comparison by means of a phonon confinement model. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Funding: The authors thank the Fondo Nacional de Desarrollo Científico, Tecnológico y de Inno-vación Tecnológica (PROCIENCIA-CONCYTEC), project number: 177-2020-FONDECYT (PROCIEN-CIA), project CLEAN NANOMAGNETIC. “The APC was funded by PROCIENCIA”. |
| Databáze: | OpenAIRE |
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