In Situ High Pressure Structural Investigation of Sm-Doped Ceria
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 stud...
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MDPI AG
2020-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/7/1558 |
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| author | Cristina Artini Sara Massardo Maria Maddalena Carnasciali Boby Joseph Marcella Pani |
| author_facet | Cristina Artini Sara Massardo Maria Maddalena Carnasciali Boby Joseph Marcella Pani |
| author_sort | Cristina Artini |
| collection | DOAJ |
| description | 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<sub>1−<i>x</i></sub>Sm<i><sub>x</sub></i>O<sub>2−<i>x</i>/2</sub> (<i>x</i> = 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 <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ln</mi> <msub> <mi>B</mi> <mn>0</mn> </msub> </mrow> </semantics> </math> </inline-formula> vs. <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ln</mi> <mrow> <mo>(</mo> <mrow> <mn>2</mn> <msub> <mi>V</mi> <mrow> <mi>a</mi> <mi>t</mi> </mrow> </msub> </mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> 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 (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>V</mi> <mrow> <mi>a</mi> <mi>t</mi> </mrow> </msub> </mrow> </semantics> </math> </inline-formula>) vs. the Sm content. The presence of RE<sub>2</sub>O<sub>3</sub>-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. |
| first_indexed | 2024-03-11T10:12:20Z |
| format | Article |
| id | doaj.art-ec8ed680dda8453a8509360c0c0610dd |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T10:12:20Z |
| publishDate | 2020-03-01 |
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| series | Energies |
| spelling | doaj.art-ec8ed680dda8453a8509360c0c0610dd2023-11-16T14:29:45ZengMDPI AGEnergies1996-10732020-03-01137155810.3390/en13071558In Situ High Pressure Structural Investigation of Sm-Doped CeriaCristina Artini0Sara Massardo1Maria Maddalena Carnasciali2Boby Joseph3Marcella Pani4Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyGdR IISc-ICTP, Elettra-Sincrotrone Trieste S.C.p.A., ss 14, km 163.5, 34149 Trieste, Basovizza, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyAs 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<sub>1−<i>x</i></sub>Sm<i><sub>x</sub></i>O<sub>2−<i>x</i>/2</sub> (<i>x</i> = 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 <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ln</mi> <msub> <mi>B</mi> <mn>0</mn> </msub> </mrow> </semantics> </math> </inline-formula> vs. <inline-formula> <math display="inline"> <semantics> <mrow> <mi>ln</mi> <mrow> <mo>(</mo> <mrow> <mn>2</mn> <msub> <mi>V</mi> <mrow> <mi>a</mi> <mi>t</mi> </mrow> </msub> </mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> 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 (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>V</mi> <mrow> <mi>a</mi> <mi>t</mi> </mrow> </msub> </mrow> </semantics> </math> </inline-formula>) vs. the Sm content. The presence of RE<sub>2</sub>O<sub>3</sub>-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.https://www.mdpi.com/1996-1073/13/7/1558solid oxides fuel cellsSm-doped ceriahigh pressure X-ray powder diffractiondiamond anvil cellequation of stateRietveld refinement |
| spellingShingle | Cristina Artini Sara Massardo Maria Maddalena Carnasciali Boby Joseph Marcella Pani In Situ High Pressure Structural Investigation of Sm-Doped Ceria Energies solid oxides fuel cells Sm-doped ceria high pressure X-ray powder diffraction diamond anvil cell equation of state Rietveld refinement |
| title | In Situ High Pressure Structural Investigation of Sm-Doped Ceria |
| title_full | In Situ High Pressure Structural Investigation of Sm-Doped Ceria |
| title_fullStr | In Situ High Pressure Structural Investigation of Sm-Doped Ceria |
| title_full_unstemmed | In Situ High Pressure Structural Investigation of Sm-Doped Ceria |
| title_short | In Situ High Pressure Structural Investigation of Sm-Doped Ceria |
| title_sort | in situ high pressure structural investigation of sm doped ceria |
| topic | solid oxides fuel cells Sm-doped ceria high pressure X-ray powder diffraction diamond anvil cell equation of state Rietveld refinement |
| url | https://www.mdpi.com/1996-1073/13/7/1558 |
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