Abstract
Abstract We have investigated the structural and chemical stability of La 0.8 Sr 0.2 MnO 3 (LSM)–8 mol.% yttria stabilized zirconia (YSZ) composite. LSM and YSZ powders were mixed and sintered at 1400 °C for 10 h in controlled atmosphere (PO 2 = 0.21 to 10 −6 atm). The unit cell volume of LSM increases during exposure to reduced oxygen partial pressure while it remains unchanged for YSZ. During reduction in the oxygen partial pressure from 0.21 atm to 10 −6 atm, the solubility of manganese in YSZ increases from ∼10 at.% to ∼15 at.%. Lower oxygen partial pressure also results in the grain growth and formation of La 2 Zr 2 O 7 and MnO x (Mn 3 O 4 ) compounds lowering the stability of the LSM–YSZ composite. On subsequent sintering in 0.21 atm PO 2 , the La 2 Zr 2 O 7 and MnO x compounds tend to disappear indicating the reversibility of the interaction. The reversibility of LSM–YSZ reaction has been independently confirmed using La 2 Zr 2 O 7 and MnO x .
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
