Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes
Neodymium silicate apatites are promising intermediate temperature (500°C–700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2−, and at low levels (0.83–2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intr...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
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| Online Access: | https://hdl.handle.net/10356/82020 http://hdl.handle.net/10220/39762 |
| _version_ | 1811694033542578176 |
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| author | An, Tao Baikie, Tom Herrin, Jason Brink, Frank Felix Shin, J. Slater, Peter R. Li, Sean White, Timothy John |
| author2 | Wei, W.-C. |
| author_facet | Wei, W.-C. An, Tao Baikie, Tom Herrin, Jason Brink, Frank Felix Shin, J. Slater, Peter R. Li, Sean White, Timothy John |
| author_sort | An, Tao |
| collection | NTU |
| description | Neodymium silicate apatites are promising intermediate temperature (500°C–700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2−, and at low levels (0.83–2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd9.33+x/3AlxSi6−xO26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens. |
| first_indexed | 2024-10-01T07:01:08Z |
| format | Journal Article |
| id | ntu-10356/82020 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:01:08Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/820202021-01-13T06:49:45Z Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes An, Tao Baikie, Tom Herrin, Jason Brink, Frank Felix Shin, J. Slater, Peter R. Li, Sean White, Timothy John Wei, W.-C. School of Materials Science and Engineering Energy Research Institute @ NTU (ERI@N) Intrinsic conductivity Electrolytes Neodymium silicate apatites are promising intermediate temperature (500°C–700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O2−, and at low levels (0.83–2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd9.33+x/3AlxSi6−xO26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens. ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2016-01-22T08:50:38Z 2019-12-06T14:44:50Z 2016-01-22T08:50:38Z 2019-12-06T14:44:50Z 2013 Journal Article An, T., Baikie, T., Herrin, J., Brink, F., Felix Shin, J., Slater, P. R., et al. (2013). Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes. Journal of the American Ceramic Society, 96(11), 3457-3462. 0002-7820 https://hdl.handle.net/10356/82020 http://hdl.handle.net/10220/39762 10.1111/jace.12489 en Journal of the American Ceramic Society © 2013 The American Ceramic Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the American Ceramic Society, The American Ceramic Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1111/jace.12489]. 21 p. application/pdf |
| spellingShingle | Intrinsic conductivity Electrolytes An, Tao Baikie, Tom Herrin, Jason Brink, Frank Felix Shin, J. Slater, Peter R. Li, Sean White, Timothy John Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title | Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title_full | Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title_fullStr | Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title_full_unstemmed | Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title_short | Oxygen Migration in Dense Spark Plasma Sintered Aluminum-Doped Neodymium Silicate Apatite Electrolytes |
| title_sort | oxygen migration in dense spark plasma sintered aluminum doped neodymium silicate apatite electrolytes |
| topic | Intrinsic conductivity Electrolytes |
| url | https://hdl.handle.net/10356/82020 http://hdl.handle.net/10220/39762 |
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