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Chemical Expansivity of Electrochemical Ceramics
Author(s) -
Adler Stuart B.
Publication year - 2001
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.1151-2916.2001.tb00968.x
Subject(s) - thermal expansion , materials science , thermodynamics , ceramic , electrochemistry , thermal , formalism (music) , mineralogy , chemistry , composite material , electrode , art , musical , visual arts , physics
To better understand thermal strain in electrochemical ceramics, the temperature and oxidation‐state dependence of lattice volume in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) were measured. Large values in the apparent thermal expansion coefficient at high temperature (>50 ppm/°C) were caused by changes in oxygen content, not increases in thermal expansivity. This material can be described using an improved thermodynamic formalism that incorporates a new physical property, the chemical expansivity . Our approach opens new avenues for modeling stress and strain in materials, probing defect structure, and analyzing transport and kinetic properties.