High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide
Simultaneous high-pressure Brillouin spectroscopy and powder X-ray diffraction of cerium dioxide powders are presented at room temperature to a pressure of 45 GPa. Micro- and nanocrystalline powders are studied and the density, acoustic velocities and elastic moduli determined. In contrast to recent...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
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Multidisciplinary Digital Publishing Institute
2021
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| Online Access: | https://hdl.handle.net/1721.1/133203 |
| _version_ | 1811079213196771328 |
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| author | Frost, Mungo Lazarz, John D. Levitan, Abraham L. Prakapenka, Vitali B. Sun, Peihao Tkachev, Sergey N. Yang, Hong Glenzer, Siegfried H. Gleason, Arianna E. |
| author_facet | Frost, Mungo Lazarz, John D. Levitan, Abraham L. Prakapenka, Vitali B. Sun, Peihao Tkachev, Sergey N. Yang, Hong Glenzer, Siegfried H. Gleason, Arianna E. |
| author_sort | Frost, Mungo |
| collection | MIT |
| description | Simultaneous high-pressure Brillouin spectroscopy and powder X-ray diffraction of cerium dioxide powders are presented at room temperature to a pressure of 45 GPa. Micro- and nanocrystalline powders are studied and the density, acoustic velocities and elastic moduli determined. In contrast to recent reports of anomalous compressibility and strength in nanocrystalline cerium dioxide, the acoustic velocities are found to be insensitive to grain size and enhanced strength is not observed in nanocrystalline CeO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>. Discrepancies in the bulk moduli derived from Brillouin and powder X-ray diffraction studies suggest that the properties of CeO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> are sensitive to the hydrostaticity of its environment. Our Brillouin data give the shear modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>G</mi><mn>0</mn></msub></semantics></math></inline-formula> = 63 (3) GPa, and adiabatic bulk modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>K</mi><mrow><mi>S</mi><mn>0</mn></mrow></msub></semantics></math></inline-formula> = 142 (9) GPa, which is considerably lower than the isothermal bulk modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>T</mi><mn>0</mn></mrow></msub><mo>∼</mo></mrow></semantics></math></inline-formula> 230 GPa, determined by high-pressure X-ray diffraction experiments. |
| first_indexed | 2024-09-23T11:11:39Z |
| format | Article |
| id | mit-1721.1/133203 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:11:39Z |
| publishDate | 2021 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | mit-1721.1/1332032021-11-01T14:36:57Z High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide Frost, Mungo Lazarz, John D. Levitan, Abraham L. Prakapenka, Vitali B. Sun, Peihao Tkachev, Sergey N. Yang, Hong Glenzer, Siegfried H. Gleason, Arianna E. Simultaneous high-pressure Brillouin spectroscopy and powder X-ray diffraction of cerium dioxide powders are presented at room temperature to a pressure of 45 GPa. Micro- and nanocrystalline powders are studied and the density, acoustic velocities and elastic moduli determined. In contrast to recent reports of anomalous compressibility and strength in nanocrystalline cerium dioxide, the acoustic velocities are found to be insensitive to grain size and enhanced strength is not observed in nanocrystalline CeO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>. Discrepancies in the bulk moduli derived from Brillouin and powder X-ray diffraction studies suggest that the properties of CeO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> are sensitive to the hydrostaticity of its environment. Our Brillouin data give the shear modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>G</mi><mn>0</mn></msub></semantics></math></inline-formula> = 63 (3) GPa, and adiabatic bulk modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>K</mi><mrow><mi>S</mi><mn>0</mn></mrow></msub></semantics></math></inline-formula> = 142 (9) GPa, which is considerably lower than the isothermal bulk modulus, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>T</mi><mn>0</mn></mrow></msub><mo>∼</mo></mrow></semantics></math></inline-formula> 230 GPa, determined by high-pressure X-ray diffraction experiments. 2021-10-27T18:30:31Z 2021-10-27T18:30:31Z 2021-07-01 2021-07-08T14:22:14Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/133203 Materials 14 (13): 3683 (2021) PUBLISHER_CC http://dx.doi.org/10.3390/ma14133683 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf Multidisciplinary Digital Publishing Institute Multidisciplinary Digital Publishing Institute |
| spellingShingle | Frost, Mungo Lazarz, John D. Levitan, Abraham L. Prakapenka, Vitali B. Sun, Peihao Tkachev, Sergey N. Yang, Hong Glenzer, Siegfried H. Gleason, Arianna E. High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title | High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title_full | High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title_fullStr | High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title_full_unstemmed | High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title_short | High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide |
| title_sort | high pressure brillouin spectroscopy and x ray diffraction of cerium dioxide |
| url | https://hdl.handle.net/1721.1/133203 |
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