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Lanthanum Chromite‐Based Interconnects as Key Materials for SOFC Stack Development
Author(s) -
Sakai Natsuko,
Yokokawa Harumi,
Horita Teruhisa,
Yamaji Katsuhiko
Publication year - 2004
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2004.tb00151.x
Subject(s) - materials science , lanthanum , chromite , oxide , chemical stability , chromium , chemical engineering , isothermal process , sintering , thermal stability , metallurgy , inorganic chemistry , thermodynamics , chemistry , physics , engineering
The historical investigations on the physicochemical and transport properties of lanthanum chromite‐based perovskite oxides are reviewed to evaluate the compatibility as interconnects in solid oxide fuel cells. These materials improve sinterability in air. This has led to investigations on other physicochemical properties of these materials, such as thermal expansion, mechanical strength, and chemical stability. Lanthanum and chromium ion can be substituted by alkaline earths or transition metals, and this translates into a large flexibility in physicochemical properties. However, the formation of oxygen vacancies in a reducing atmosphere can result in an undesirable isothermal expansion or oxygen permeation. The chemical stability of these materials is governed by the fast cation diffusion at the grain boundary of the polycrystals.