Chemical Expansivity of Electrochemical Ceramics

作者：Stuart B. Adler · 发表于：Journal of the American Ceramic Society · 年份：2001 · DOI：10.1111/j.1151-2916.2001.tb00968.x · 被引用次数：307 · 研究领域：Advancements in Solid Oxide Fuel Cells、Magnetic and transport properties of perovskites and related materials、Electronic and Structural Properties of Oxides

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.