Publication Date:
2019
Description:
〈p〉Publication date: May 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Journal of the European Ceramic Society, Volume 39, Issue 5〈/p〉
〈p〉Author(s): Fen Qin, Hee-Suk Roh, Salim Caliskan, Seongha Lee, Sun-Dong Kim, Sang Kook Woo, Jung-Kun Lee〈/p〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉We studied crystallization, grain growth and electric properties of La〈sub〉0.8〈/sub〉Sr〈sub〉0.2〈/sub〉MnO〈sub〉3〈/sub〉 (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 La〈sub〉2〈/sub〉Mn〈sub〉2〈/sub〉O〈sub〉7〈/sub〉 at 550 °C, due to higher dielectric polarizability of La. This, in turn, decreases the amount of the second phase La〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 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 ZrO〈sub〉2〈/sub〉 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.〈/p〉〈/div〉
Print ISSN:
0955-2219
Electronic ISSN:
1873-619X
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
