In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub>
Lattice defects significantly affect the mechanical properties of crystalline metal oxides. The materials for the components of solid oxide fuel cells (SOFCs) are no exception, and hence understanding of the interplay between lattice defects and the mechanical properties of components is important t...
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MDPI AG
2021-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/12/1889 |
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| author | Yuta Kimura Takashi Nakamura Koji Amezawa Keiji Yashiro Tatsuya Kawada |
| author_facet | Yuta Kimura Takashi Nakamura Koji Amezawa Keiji Yashiro Tatsuya Kawada |
| author_sort | Yuta Kimura |
| collection | DOAJ |
| description | Lattice defects significantly affect the mechanical properties of crystalline metal oxides. The materials for the components of solid oxide fuel cells (SOFCs) are no exception, and hence understanding of the interplay between lattice defects and the mechanical properties of components is important to ensure the mechanical stability of SOFCs. Herein, we performed an in situ evaluation of the temperature and <i>P</i>(O<sub>2</sub>) dependence of the elastic moduli of La<sub>2</sub>NiO<sub>4</sub> (LN214), a candidate for the cathode material of SOFCs, using the resonance method to understand the influence of interstitial oxygen on its elastic properties. Above 873 K, both the Young’s and shear moduli of LN214 slightly decreased with increasing <i>P</i>(O<sub>2</sub>), suggesting that these elastic moduli are correlated with interstitial oxygen concentration and decreased with increasing interstitial oxygen. We analyzed the influence of interstitial oxygen on the Young’s modulus of LN214, based on numerically obtained lattice energy. The <i>P</i>(O<sub>2</sub>) dependence of the Young’s modulus of LN214 was found to be essentially explained by variation in the <i>c</i>-lattice constant, which was triggered by variation in interstitial oxygen concentration. These findings may contribute to a better understanding of the relationship between lattice defects and mechanical properties, and to the improvement of the mechanical stability of SOFCs. |
| first_indexed | 2024-03-10T03:35:17Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:35:17Z |
| publishDate | 2021-11-01 |
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| spelling | doaj.art-79874ca9ac60416aa3596f34c0c8fb1e2023-11-23T09:32:33ZengMDPI AGMetals2075-47012021-11-011112188910.3390/met11121889In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub>Yuta Kimura0Takashi Nakamura1Koji Amezawa2Keiji Yashiro3Tatsuya Kawada4Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Miyagi, JapanInstitute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Miyagi, JapanInstitute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Miyagi, JapanGraduate School of Environmental Studies, Tohoku University, 6-6-04, Aramaki Aoba Aoba-ku, Sendai 980-8579, Miyagi, JapanGraduate School of Environmental Studies, Tohoku University, 6-6-04, Aramaki Aoba Aoba-ku, Sendai 980-8579, Miyagi, JapanLattice defects significantly affect the mechanical properties of crystalline metal oxides. The materials for the components of solid oxide fuel cells (SOFCs) are no exception, and hence understanding of the interplay between lattice defects and the mechanical properties of components is important to ensure the mechanical stability of SOFCs. Herein, we performed an in situ evaluation of the temperature and <i>P</i>(O<sub>2</sub>) dependence of the elastic moduli of La<sub>2</sub>NiO<sub>4</sub> (LN214), a candidate for the cathode material of SOFCs, using the resonance method to understand the influence of interstitial oxygen on its elastic properties. Above 873 K, both the Young’s and shear moduli of LN214 slightly decreased with increasing <i>P</i>(O<sub>2</sub>), suggesting that these elastic moduli are correlated with interstitial oxygen concentration and decreased with increasing interstitial oxygen. We analyzed the influence of interstitial oxygen on the Young’s modulus of LN214, based on numerically obtained lattice energy. The <i>P</i>(O<sub>2</sub>) dependence of the Young’s modulus of LN214 was found to be essentially explained by variation in the <i>c</i>-lattice constant, which was triggered by variation in interstitial oxygen concentration. These findings may contribute to a better understanding of the relationship between lattice defects and mechanical properties, and to the improvement of the mechanical stability of SOFCs.https://www.mdpi.com/2075-4701/11/12/1889in situ evaluationelastic moduluslattice defectssolid oxide fuel cellsLa<sub>2</sub>NiO<sub>4</sub> |
| spellingShingle | Yuta Kimura Takashi Nakamura Koji Amezawa Keiji Yashiro Tatsuya Kawada In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> Metals in situ evaluation elastic modulus lattice defects solid oxide fuel cells La<sub>2</sub>NiO<sub>4</sub> |
| title | In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> |
| title_full | In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> |
| title_fullStr | In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> |
| title_full_unstemmed | In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> |
| title_short | In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La<sub>2</sub>NiO<sub>4</sub> |
| title_sort | in situ evaluation of the influence of interstitial oxygen on the elastic modulus of la sub 2 sub nio sub 4 sub |
| topic | in situ evaluation elastic modulus lattice defects solid oxide fuel cells La<sub>2</sub>NiO<sub>4</sub> |
| url | https://www.mdpi.com/2075-4701/11/12/1889 |
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