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Mechanical Properties of Strontium‐Doped Lanthanum Manganite
Author(s) -
D'Souza Clive M.,
Sammes Nigel M.
Publication year - 2000
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.1151-2916.2000.tb01146.x
Subject(s) - lanthanum manganite , materials science , manganite , oxide , strontium , perovskite (structure) , thermal expansion , cathode , solid oxide fuel cell , lanthanum , electrolyte , cobalt , mineralogy , composite material , inorganic chemistry , metallurgy , crystallography , condensed matter physics , chemistry , electrode , physics , organic chemistry , ferromagnetism
Solid oxide fuel cells that incorporate stabilized‐zirconia electrolytes commonly use the transition‐metal oxide perovskite La 0.875 Sr 0.125 MnO 3+δ as the cathode. While in operation, the cathode can be subjected to significant stresses, because of thermal expansion mismatch between mating components. The mechanical behavior of La 0.875 Sr 0.125 MnO 3+δ has been studied using three‐point bend strength measurements at ambient, 400°C, 800°C and 1000°C. The results show that phase transformations have an important role in the mechanical‐strength behavior. The results also indicate some unique strengthening effects that are associated with the evolution of the unit cell with temperature and the increasing symmetry of the crystal lattice.