Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site
Attempts to achieve near theoretical density in polycrystalline LaGaO3 compacts using Fe2O3 as a dopant have been made. The B-site substituted lanthanum gallates with iron doping ranging from 15 to 55 mole% FeO1.5 (Fe2O3) were synthesized via solid state reaction using oxide and nitrate precursors a...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Springer Netherlands
2001
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| Online Access: | http://psasir.upm.edu.my/id/eprint/115000/1/115000.pdf |
| _version_ | 1824452506226262016 |
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| author | Chandrasekaran, A. Azad, A.-M. |
| author_facet | Chandrasekaran, A. Azad, A.-M. |
| author_sort | Chandrasekaran, A. |
| collection | UPM |
| description | Attempts to achieve near theoretical density in polycrystalline LaGaO3 compacts using Fe2O3 as a dopant have been made. The B-site substituted lanthanum gallates with iron doping ranging from 15 to 55 mole% FeO1.5 (Fe2O3) were synthesized via solid state reaction using oxide and nitrate precursors and sintered at 1200°C for 24 to 72 h and at 1300°C for 12 to 36 h. Systematic variation in the lattice constants and microstructural aspects was followed as a function of mole fraction of Fe2O3. It was found that the parent LaGaO3 structure could take up as high as 55 mole% of Fe2O3 retaining the orthorhombic crystal structure. Compositions containing 35 mole% Fe2O3 soaked for 48 h or more at 1200°C and for as low as 12 h at 1300°C resulted in perfectly dense compacts. Bodies containing lower dopant concentrations (xFe2O3 ≤ 0.25) were found to have a substantial degree of porosity with good intergranular connectivity, while a significant amount of grain growth and broad grain size distribution was an interesting feature in samples containing mole fractions higher than 0.35. |
| first_indexed | 2025-02-19T02:51:36Z |
| format | Article |
| id | upm.eprints-115000 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2025-02-19T02:51:36Z |
| publishDate | 2001 |
| publisher | Springer Netherlands |
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| spelling | upm.eprints-1150002025-02-14T03:12:57Z http://psasir.upm.edu.my/id/eprint/115000/ Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site Chandrasekaran, A. Azad, A.-M. Attempts to achieve near theoretical density in polycrystalline LaGaO3 compacts using Fe2O3 as a dopant have been made. The B-site substituted lanthanum gallates with iron doping ranging from 15 to 55 mole% FeO1.5 (Fe2O3) were synthesized via solid state reaction using oxide and nitrate precursors and sintered at 1200°C for 24 to 72 h and at 1300°C for 12 to 36 h. Systematic variation in the lattice constants and microstructural aspects was followed as a function of mole fraction of Fe2O3. It was found that the parent LaGaO3 structure could take up as high as 55 mole% of Fe2O3 retaining the orthorhombic crystal structure. Compositions containing 35 mole% Fe2O3 soaked for 48 h or more at 1200°C and for as low as 12 h at 1300°C resulted in perfectly dense compacts. Bodies containing lower dopant concentrations (xFe2O3 ≤ 0.25) were found to have a substantial degree of porosity with good intergranular connectivity, while a significant amount of grain growth and broad grain size distribution was an interesting feature in samples containing mole fractions higher than 0.35. Springer Netherlands 2001-10 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/115000/1/115000.pdf Chandrasekaran, A. and Azad, A.-M. (2001) Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site. Journal of Materials Science, 36 (19). pp. 4745-4757. ISSN 0022-2461; eISSN: 0022-2461 https://link.springer.com/article/10.1023/A:1017935207284?error=cookies_not_supported&code=5054aa99-9664-4192-b2c1-4d0066b605b5 10.1023/A:1017935207284 |
| spellingShingle | Chandrasekaran, A. Azad, A.-M. Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title | Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title_full | Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title_fullStr | Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title_full_unstemmed | Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title_short | Densification of LaGaO3 at low sintering temperatures via Fe3+ substitution at Ga3+ site |
| title_sort | densification of lagao3 at low sintering temperatures via fe3 substitution at ga3 site |
| url | http://psasir.upm.edu.my/id/eprint/115000/1/115000.pdf |
| work_keys_str_mv | AT chandrasekarana densificationoflagao3atlowsinteringtemperaturesviafe3substitutionatga3site AT azadam densificationoflagao3atlowsinteringtemperaturesviafe3substitutionatga3site |