Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3
The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO 3 ceramics by tuning the ratio of Fe 2+ /Fe 3+ through substituting Al for Fe. The ratio of Fe 2+ /Fe 3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al 3...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley-Blackwell Publishing, Inc.
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/57000 |
| _version_ | 1848759990977822720 |
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| author | Ni, W. Ye, J. Guo, Y. Cheng, C. Lin, Z. Li, Y. Wang, H. Yu, Y. Li, Q. Huang, S. Shao, Zongping Wang, C. |
| author_facet | Ni, W. Ye, J. Guo, Y. Cheng, C. Lin, Z. Li, Y. Wang, H. Yu, Y. Li, Q. Huang, S. Shao, Zongping Wang, C. |
| author_sort | Ni, W. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO 3 ceramics by tuning the ratio of Fe 2+ /Fe 3+ through substituting Al for Fe. The ratio of Fe 2+ /Fe 3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al 3+ . Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe 2+ /Fe 3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/? 2 0 , where ? 0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides. |
| first_indexed | 2025-11-14T10:08:40Z |
| format | Journal Article |
| id | curtin-20.500.11937-57000 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:08:40Z |
| publishDate | 2017 |
| publisher | Wiley-Blackwell Publishing, Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-570002018-01-15T03:45:20Z Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 Ni, W. Ye, J. Guo, Y. Cheng, C. Lin, Z. Li, Y. Wang, H. Yu, Y. Li, Q. Huang, S. Shao, Zongping Wang, C. The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO 3 ceramics by tuning the ratio of Fe 2+ /Fe 3+ through substituting Al for Fe. The ratio of Fe 2+ /Fe 3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al 3+ . Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe 2+ /Fe 3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/? 2 0 , where ? 0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides. 2017 Journal Article http://hdl.handle.net/20.500.11937/57000 10.1111/jace.14860 Wiley-Blackwell Publishing, Inc. restricted |
| spellingShingle | Ni, W. Ye, J. Guo, Y. Cheng, C. Lin, Z. Li, Y. Wang, H. Yu, Y. Li, Q. Huang, S. Shao, Zongping Wang, C. Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title | Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title_full | Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title_fullStr | Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title_full_unstemmed | Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title_short | Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 |
| title_sort | decisive role of mixed-valence structure in colossal dielectric constant of lafeo3 |
| url | http://hdl.handle.net/20.500.11937/57000 |