Premium
Thermal Expansion Behavior of Titanium‐Doped La(Sr)CrO 3 Solid Oxide Fuel Cell Interconnects
Author(s) -
Mori Masashi,
Hiei Yoshiko
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.tb01056.x
Subject(s) - thermal expansion , oxidizing agent , materials science , solid oxide fuel cell , sintering , oxide , partial pressure , reducing atmosphere , perovskite (structure) , atmospheric temperature range , oxygen , analytical chemistry (journal) , mineralogy , metallurgy , chemical engineering , chemistry , thermodynamics , anode , engineering , physics , organic chemistry , electrode , chromatography
La 0.8 Sr 0.2 Cr 0.9 Ti 0.1 O 3 perovskite has been designed as an interconnect material in high‐temperature solid oxide fuel cells (SOFCs) because of its thermal expansion compatibility in both oxidizing and reducing atmospheres. La 0.8 Sr 0.2 Cr 0.9 Ti 0.1 O 3 shows a single phase with a hexagonal unit cell of a = 5.459(1) Å, c = 13.507(2) Å, Z = 6 and a space group of R ‐3 C . Average linear thermal expansion coefficients of this material in the temperature range from 50° to 1000°C were 10.4 × 10 −6 /°C in air, 10.5 × 10 −6 /°C under a He–H 2 atmosphere (oxygen partial pressure of 4 × 10 −15 atm at 1000°C), and 10.9 × 10 −6 /°C in a H 2 atmosphere (oxygen partial pressure of 4 × 10 −19 atm at 1000°C). La 0.8 Sr 0.2 Cr 0.9 Ti 0.1 O 3 perovskite with a linear thermal expansion in both oxidizing and reducing environments is a promising candidate material for an SOFC interconnect. However, there still remains an air‐sintering problem to be solved in using this material as an SOFC interconnect.