| Records |
Author  |
Rendon, R.C.; Salvo, C.; Sepulveda, E.; Arulraj, A.; Sanhueza, F.; Rodriguez, J.J.; Mangalaraja, R.V. |
| Title |
Evaluation of Structural and Functional Properties of La0.6Sr0.4MnO3 Perovskite Prepared by the Fast Solution Combustion Approach |
Type |
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| Year |
2022 |
Publication |
Catalysts |
Abbreviated Journal |
Catalysts |
| Volume |
12 |
Issue |
12 |
Pages |
1636 |
| Keywords |
LSM; fast solution combustion synthesis; microstructure; hardness; resistivity |
| Abstract |
A series of La0.6Sr0.4MnO3 (LSM) perovskite was made using the rapid solution combustion method, which was calcined by varying the temperatures. In order to determine how the calcination temperature affected the nanopowders produced and calcined at various temperatures, their microstructural, morphological, compositional, optical, and electrical properties were analyzed using corresponding characterization tools. The XRD results showed the coexistence of the rhombohedral polymorphs R-3c and Pm-3m for the perovskite phase under a calcination temperature of 1400 degrees C, which were eliminated with increased calcination temperature. The average grain size was found to increase with increasing calcination temperature. The EDS analysis showed better agreement of the stoichiometry with the theoretical composition. The apparent porosity decreased with increasing temperature due to the coalescence of sintering pores. The sample obtained after calcination at 1500 degrees C showed 10.3% porosity. The hardness also improved with increasing calcination temperature and reached a maximum value of 0.4 GPa, which matched the bulk density. A similar trend was observed in the resistivity studies as a function of temperature, and all the samples exhibited a low resistivity of similar to 1.4 Omega.cm in the temperature range of 500-600 degrees C. The optical characterization showed broad absorption at 560-660 nm and bandwidth values between 3.70 and 3.95 eV, according to the applied heat treatment. |
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Edition |
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| ISSN |
2073-4344 |
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| Notes |
WOS:000902326100001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1703 |
| Permanent link to this record |
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| Author |
Rendon, R.C.; Udayabhaskar, R.; Salvo, C.; Sepulveda, E.; Rodriguez, J.J.; Camurri-Porro, C.; Mangalaraja, R.V. |
| Title |
Evaluation of La0.8Sr0.2MnO3 perovskite prepared by fast solution combustion |
Type |
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| Year |
2022 |
Publication |
Ceramics International |
Abbreviated Journal |
Ceram. Int. |
| Volume |
48 |
Issue |
23 |
Pages |
35100-35107 |
| Keywords |
LSM; Fast solution combustion synthesis; Microstructure; ReSOFC |
| Abstract |
La0.8Sr0.2MnO3 (LSM) perovskite as oxygen electrode material for the reversible solid oxide fuel cells (ReSOFC) was synthesized by the fast solution combustion method and assessed for subsequent calcination influence. The microstructural, morphological, compositional and optical properties of the obtained material were analyzed with X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM) coupled with an energy-dispersive X-ray spectroscopy detector (EDS) and UV-visible spectroscopy techniques. The XRD results showed the coexistence of rhombohedral R-3c and Pm-3m polymorphs for the perovskite phase, with a decreased fraction of the cubic phase as the temperature and/or time used for the calcination were increased. The HR-TEM images confirmed the existence of the R-3c and Pm-3m polymorphs for the sample subjected to calcination at 1300 degrees C, showing that the rapid combustion method did not allow the pure formation of the La0.8Sr0.2MnO3 phase for the calcination temperatures below 1400 degrees C, due to the swiftness of the combustion synthesis 500 degrees C for 5 min. The average grain size was found to be increased with the calcination time. The EDS analysis depicted a better agreement in stoichiometry with the theoretical composition. The apparent porosity was decreased with the increase in the temperature and calcination time due to the coalescence of the sintering pores. The sample obtained after the calcination at 1400 degrees C for 8 h exhibited 1.6% of porosity. The hardness was improved with the higher calcination time and temperature and reached a maximum value of 5.7 GPa that merely matched the bulk density. A similar trend was observed in the temperature dependence resistivity studies and all the samples presented a low resistivity of similar to 1.2 Omega cm in the temperature range of 600-700 degrees C. The optical characterization exhibited a broad absorption in 560-660 nm. |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0272-8842 |
ISBN |
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Medium |
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Conference |
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| Notes |
WOS:000896853400004 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1705 |
| Permanent link to this record |
