Enhancement of grain growth and electrical conductivity of La0.8Sr0.2MnO3 ceramics by microwave irradiation
| Autor: | Salim Caliskan, Sang Kook Woo, Sun-Dong Kim, Hee Suk Roh, Seongha Lee, Jung-Kun Lee, Fen Qin |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Sintering 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Amorphous solid law.invention Grain growth Crystallinity Chemical engineering law visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Crystallization 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of the European Ceramic Society. 39:1854-1859 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2018.12.050 |
| Popis: | We studied crystallization, grain growth and electric properties of La0.8Sr0.2MnO3 (LSM) ceramics which were produced using the microwave-treatment. While co-precipitated nanoparticles remain mainly amorphous, the microwave irradiated particles are crystallized into LSM and La2Mn2O7 at 550 °C, due to higher dielectric polarizability of La. This, in turn, decreases the amount of the second phase La2O3 in calcined powder and promotes the growth of perovskite grains during sintering at 1400 °C. Larger grains of LSM ceramics lower the activation energy of small polaron hopping from 0.35 eV to 0.24 eV and increases high-temperature electric conductivity. In addition, high crystallinity of LSM ceramics from the microwave-treatment suppresses a chemical reaction with ZrO2 and NiO in a temperature range of 900 – 1100 °C under oxidizing and reducing ambiances. These results show that LSM ceramics from the microwave-assisted reaction meet requirements for an interconnect layer for solid oxide electrolysis cells. |
| Databáze: | OpenAIRE |
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