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In Situ High Pressure Structural Investigation of Sm-Doped Ceria

Author

Listed:
  • Cristina Artini

    (Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, Italy
    Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, CNR-ICMATE, 16149 Genova, Italy)

  • Sara Massardo

    (Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, Italy)

  • Maria Maddalena Carnasciali

    (Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, Italy
    INSTM, Genova Research Unit, Via Dodecaneso 31, 16146 Genova, Italy)

  • Boby Joseph

    (GdR IISc-ICTP, Elettra-Sincrotrone Trieste S.C.p.A., ss 14, km 163.5, 34149 Trieste, Basovizza, Italy)

  • Marcella Pani

    (Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, Italy
    CNR-SPIN, 16152 Genova, Italy)

Abstract

As a result of the lattice mismatch between the oxide itself and the substrate, the high-pressure structural properties of trivalent rare earth (RE)-doped ceria systems help to mimic the compressive/tensile strain in oxide thin films. The high-pressure structural features of Sm-doped ceria were studied by X-ray diffraction experiments performed on Ce 1− x Sm x O 2− x /2 ( x = 0.2, 0.3, 0.4, 0.5, 0.6) up to 7 GPa, and the cell volumes were fitted by the third order Vinet equation of state (EoS) at the different pressures obtained from Rietveld refinements. A linear decrease of the ln B 0 vs. ln ( 2 V a t ) trend occurred as expected, but the regression line was much steeper than predicted for oxides, most probably due to the effect of oxygen vacancies arising from charge compensation, which limits the increase of the mean atomic volume ( V a t ) vs. the Sm content. The presence of RE 2 O 3 -based cubic microdomains within the sample stiffens the whole structure, making it less compressible with increases in applied pressure. Results are discussed in comparison with ones previously obtained from Lu-doped ceria.

Suggested Citation

  • Cristina Artini & Sara Massardo & Maria Maddalena Carnasciali & Boby Joseph & Marcella Pani, 2020. "In Situ High Pressure Structural Investigation of Sm-Doped Ceria," Energies, MDPI, vol. 13(7), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1558-:d:337941
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    References listed on IDEAS

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    1. Cristina Artini & Sabrina Presto & Sara Massardo & Marcella Pani & Maria Maddalena Carnasciali & Massimo Viviani, 2019. "Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria," Energies, MDPI, vol. 12(21), pages 1-11, October.
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