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Reaction Kinetics and Mechanisms between La 0.65 Sr 0.3 MnO 3 and 8 mol% Yttria‐Stabilized Zirconia
Author(s) -
Yang ChihChung T.,
Wei WenCheng J.,
Roosen Andreas
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01110.x
Subject(s) - yttria stabilized zirconia , materials science , lanthanum manganite , cubic zirconia , kinetics , lanthanum , solid oxide fuel cell , diffusion , oxygen , activation energy , suboxide , vacancy defect , oxide , inorganic chemistry , crystallography , chemistry , composite material , metallurgy , ceramic , thermodynamics , physics , organic chemistry , electrode , quantum mechanics , anode , electrolyte
The reaction kinetics and mechanisms between 8 mol% yttria‐stabilized zirconia (YSZ) and 30 mol% Sr‐doped lanthanum manganite (La 0.65 Sr 0.30 MnO 3 , LSM) with A‐site deficiency for the application of planar solid oxide fuel cells (SOFCs) were investigated. The LSM/YSZ green tapes were cofired from 1200° to 1400°C for 1 to 48 h and then annealed at 1000°C for up to 1000 h. The results showed that the diffusion of manganese cations first caused the amorphization of YSZ, and then the formation of small La 2 Zr 2 O 7 (LZ) or SrZrO 3 (SZ) crystals if treated for a longer time at 1400°C. The ambipolar diffusion of the Mn–O pair, transported through the migration of oxygen vacancy, plays an important role in the formation of secondary phases. The diffusion of LSM to YSZ and substitution of Mn for Zr both result in the enhanced concentration of oxygen vacancy, leading to the formation of a void‐free zone (VFZ). No additional reaction products in annealed LSM/YSZ specimens, treated at 1000°C for 1000 h, were detected. The interfacial reactions, detailed reaction kinetics, and mechanisms are reported.