Thermal expansion behavior of titanium-doped La(Sr)CrO3 solid oxide fuel cell interconnects

La0.8Sr0.2Cr0.9Ti0.1O3 perovskite has been designed as an interconnect mate rial in high-temperature solid oxide fuel cells (SOFCs) because of its ther mal expansion compatibility in both oxidizing and reducing atmospheres. La0 .8Sr0.2Cr0.9Ti0.1O3 shows a single phase with a hexagonal unit cell of a = 5.459(1)Angstrom, c = 13.507(2) Angstrom, Z = 6 and a space group of R-3C. Average linear thermal expansion coefficients of this material in the tempe rature range from 50 degrees to 1000 degreesC were 10.4 x 10(-6)/degreesC i n air, 10.5 x 10(-6)/degreesC under a He-H-2 atmosphere (oxygen partial pre ssure of 4 x 10(-15) atm at 1000 degreesC), and 10.9 x 10(-6)/degreesC in a H-2 atmosphere (oxygen partial pressure of 4 x 10(-19) atm at 1000 degrees C). La0.8Sr0.2Cr0.9Ti0.1O3 perovskite with a linear thermal expansion in bo th oxidizing and reducing environments is a promising candidate material fo r an SOFC interconnect. However, there still remains an air-sintering probl em to be solved in using this material as an SOFC interconnect.