Strain and grain size determination of ceo2 and tio2 nanoparticles: Comparing integral breadth methods versus rietveld, µ-raman, and tem

Yamerson Canchanya-Huaman, Angie F. Mayta-Armas, Jemina Pomalaya-Velasco, Yéssica Bendezú-Roca, Jorge Andres Guerra, Juan A. Ramos-Guivar

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number2311
JournalNanomaterials
Volume11
Issue number9
DOIs
StatePublished - Sep 2021
Externally publishedYes

Bibliographical note

Funding Information:
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”.

Funding Information:
Acknowledgments: The authors thank the support of the Center of Materials Characterization of the Pontificia Universidad Católica del Peru (CAM-PUCP). We finally thank Fred Jochen Litterst from IPKM-TU Braunschweig for the helpful discussions and critical reading of our manuscript.

Funding Information:
The authors thank the Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Inno-vaci?n Tecnol?gica (PROCIENCIA-CONCYTEC), project number: 177-2020-FONDECYT (PROCIEN-CIA), project CLEAN NANOMAGNETIC. ?The APC was funded by PROCIENCIA?. Acknowledgments: The authors thank the support of the Center of Materials Characterization of the Pontificia Universidad Cat?lica del Peru (CAM-PUCP). We finally thank Fred Jochen Litterst from IPKM-TU Braunschweig for the helpful discussions and critical reading of our manuscript.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • CeO
  • Crystallite size
  • Strain
  • TEM
  • TiO
  • X-ray diffraction
  • µ-Raman

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