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Artini C, Pani M, Carnasciali MM, et al. Structural features of Sm- and Gd-doped ceria studied by synchrotron X-ray diffraction and μ-Raman spectroscopy. Inorg Chem. 2015;54(8):4126-37doi: 10.1021/acs.inorgchem.5b00395.
Artini, C., Pani, M., Carnasciali, M. M., Buscaglia, M. T., Plaisier, J. R., & Costa, G. A. (2015). Structural features of Sm- and Gd-doped ceria studied by synchrotron X-ray diffraction and μ-Raman spectroscopy. Inorganic chemistry, 54(8), 4126-37. https://doi.org/10.1021/acs.inorgchem.5b00395
Artini, Cristina, et al. "Structural features of Sm- and Gd-doped ceria studied by synchrotron X-ray diffraction and μ-Raman spectroscopy." Inorganic chemistry vol. 54,8 (2015): 4126-37. doi: https://doi.org/10.1021/acs.inorgchem.5b00395
Artini C, Pani M, Carnasciali MM, Buscaglia MT, Plaisier JR, Costa GA. Structural features of Sm- and Gd-doped ceria studied by synchrotron X-ray diffraction and μ-Raman spectroscopy. Inorg Chem. 2015 Apr 20;54(8):4126-37. doi: 10.1021/acs.inorgchem.5b00395. Epub 2015 Apr 07. PMID: 25849073.
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Inorg Chem. 2015 Apr 20;54(8):4126-37. doi: 10.1021/acs.inorgchem.5b00395. Epub 2015 Apr 07.

Structural features of Sm- and Gd-doped ceria studied by synchrotron X-ray diffraction and μ-Raman spectroscopy.

Inorganic chemistry

Cristina Artini, Marcella Pani, Maria Maddalena Carnasciali, Maria Teresa Buscaglia, Jasper Rikkert Plaisier, Giorgio Andrea Costa

Affiliations

  1. †DCCI, Department of Chemistry and Industrial Chemistry, University of Genova, Via Dodecaneso 31, 16146 Genova, Italy.
  2. ‡CNR-IENI, Via De Marini 6, 16149 Genova, Italy.
  3. §CNR-SPIN Genova, Corso Perrone 24, 16152 Genova, Italy.
  4. ?INSTM, Genova Research Unit, Via Dodecaneso 31, 16146 Genova, Italy.
  5. ?Elettra - Sincrotrone Trieste S.C.p.A., ss 14, km 163.5, 34149 Basovizza, Trieste, Italy.

PMID: 25849073 DOI: 10.1021/acs.inorgchem.5b00395

Abstract

A structural study of Sm- and Gd-doped ceria was performed with the aim to clarify some unexplained structural features. (Ce1-xREx)O2-x/2 samples (RE ≡ Sm, Gd; x = 0, 0.1, ..., 1) were prepared by coprecipitation of mixed oxalates and subsequent thermal treatment at 1473, 1173, or 1073 K in air; they were then analyzed at room temperature both by synchrotron X-ray diffraction and μ-Raman spectroscopy. Two structural models were adopted to fit the experimental data, namely, a fluoritic one, resembling the CeO2 structure at low RE content, and a hybrid one at higher RE content, intermediate between the CeO2 and the RE2O3 structures. Two main transitions were detected along the compositional range: (a) an RE-dependent transition at the boundary between the fluoritic and the hybrid regions, of a chemical nature; (b) an RE-independent transition within the hybrid region at ∼0.5, having a purely geometrical nature. The presence of two finely interlaced F- and C-based structures within the hybrid region was confirmed, and hints of their composition were obtained by μ-Raman spectroscopy. The obtained results indicate a possible explanation for the non-Vegard behavioral trend of the cell parameters.

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