Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution
Perovskite solid solution powders with (La1−xSrx)(Al1−yMgy)O3−δ composition (shorten as LSAM) were prepared by a coprecipitation method using corresponding aqueous solutions and ammonium carbonate solution. The freeze-dried powders were heated in air at 1500 °C for 10 h, and subsequently sintered at...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2014-06-01
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| Series: | Journal of Asian Ceramic Societies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2187076414000384 |
| _version_ | 1818415636583284736 |
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| author | Yoshihiro Hirata Akiko Shinomiya Ikuno Mukai Soichiro Sameshima Taro Shimonosono Naoki Matsunaga |
| author_facet | Yoshihiro Hirata Akiko Shinomiya Ikuno Mukai Soichiro Sameshima Taro Shimonosono Naoki Matsunaga |
| author_sort | Yoshihiro Hirata |
| collection | DOAJ |
| description | Perovskite solid solution powders with (La1−xSrx)(Al1−yMgy)O3−δ composition (shorten as LSAM) were prepared by a coprecipitation method using corresponding aqueous solutions and ammonium carbonate solution. The freeze-dried powders were heated in air at 1500 °C for 10 h, and subsequently sintered at 1400 °C for 12 h in air. The X-ray diffraction patterns and the lattice parameters for the compositions of x = 0–0.4 at y = 0.1 and y = 0–0.15 at x = 0.2 suggested the formation of rhombohedral LaAlO3 solid solution. The sinterability of LSAM was controlled by the diffusion rate of A site cations and increased by increasing Sr composition at A site and by decreasing Mg composition at B site. The highest electrical conductivity was measured at the composition of (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 (6.79 × 10−3 S/cm at 600 °C, activation energy 98.8 kJ/mol). Although the sintered (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 electrolyte contained 28% porosity, its conductivity was higher than the conductivity of dense 8 mol% yttria-stabilized zirconia electrolyte. The conductivity and activation energy of LSAM greatly vary according to the concentration of available oxygen vacancy and the association of positively charged oxygen vacancy and negatively charged Sr′La sites or Mg′Al sites. The LSAM composition of (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 provided the perovskite structure of the smaller strain (tolerance factor 1.007). This is another factor for the highest conductivity. |
| first_indexed | 2024-12-14T11:38:09Z |
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| institution | Directory Open Access Journal |
| issn | 2187-0764 |
| language | English |
| last_indexed | 2024-12-14T11:38:09Z |
| publishDate | 2014-06-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Asian Ceramic Societies |
| spelling | doaj.art-d58b9c0d640f46cdb1d64a4d4225798d2022-12-21T23:02:57ZengTaylor & Francis GroupJournal of Asian Ceramic Societies2187-07642014-06-012217618410.1016/j.jascer.2014.03.005Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solutionYoshihiro Hirata0Akiko Shinomiya1Ikuno Mukai2Soichiro Sameshima3Taro Shimonosono4Naoki Matsunaga5Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, JapanDepartment of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, JapanDepartment of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, JapanDepartment of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, JapanDepartment of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, JapanDepartment of Environmental Robotics, University of Miyazaki, 1-1 Gakuen-Kihanadai, Miyazaki 889-2192, JapanPerovskite solid solution powders with (La1−xSrx)(Al1−yMgy)O3−δ composition (shorten as LSAM) were prepared by a coprecipitation method using corresponding aqueous solutions and ammonium carbonate solution. The freeze-dried powders were heated in air at 1500 °C for 10 h, and subsequently sintered at 1400 °C for 12 h in air. The X-ray diffraction patterns and the lattice parameters for the compositions of x = 0–0.4 at y = 0.1 and y = 0–0.15 at x = 0.2 suggested the formation of rhombohedral LaAlO3 solid solution. The sinterability of LSAM was controlled by the diffusion rate of A site cations and increased by increasing Sr composition at A site and by decreasing Mg composition at B site. The highest electrical conductivity was measured at the composition of (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 (6.79 × 10−3 S/cm at 600 °C, activation energy 98.8 kJ/mol). Although the sintered (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 electrolyte contained 28% porosity, its conductivity was higher than the conductivity of dense 8 mol% yttria-stabilized zirconia electrolyte. The conductivity and activation energy of LSAM greatly vary according to the concentration of available oxygen vacancy and the association of positively charged oxygen vacancy and negatively charged Sr′La sites or Mg′Al sites. The LSAM composition of (La0.8Sr0.2)(Al0.9Mg0.1)O2.85 provided the perovskite structure of the smaller strain (tolerance factor 1.007). This is another factor for the highest conductivity.http://www.sciencedirect.com/science/article/pii/S2187076414000384Electrical conductivityOxide ion conductivitySinteringPerovskiteSolid solution |
| spellingShingle | Yoshihiro Hirata Akiko Shinomiya Ikuno Mukai Soichiro Sameshima Taro Shimonosono Naoki Matsunaga Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution Journal of Asian Ceramic Societies Electrical conductivity Oxide ion conductivity Sintering Perovskite Solid solution |
| title | Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution |
| title_full | Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution |
| title_fullStr | Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution |
| title_full_unstemmed | Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution |
| title_short | Synthesis and electrical conductivity of (La1−xSrx)(Al1−yMgy)O3−δ perovskite solid solution |
| title_sort | synthesis and electrical conductivity of la1 xsrx al1 ymgy o3 δ perovskite solid solution |
| topic | Electrical conductivity Oxide ion conductivity Sintering Perovskite Solid solution |
| url | http://www.sciencedirect.com/science/article/pii/S2187076414000384 |
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