Nd1−xCaxCrO3 (0≤x≤0.25) solid solutions are synthesized using a two-step calcination solid-state reaction method and can potentially be used as interconnect applications in solid oxide fuel cells (SOFCs). The lattice parameters and unit cell volume decrease with an increase of the Ca2+ dopant concentration at the A-site. On the other hand, the relative density, electrical conductivity, and thermal expansion coefficient (TEC) increase with an increase of Ca2+ contents. Calcium doping significantly depresses the chromium vaporization of NdCrO3, thus accelerating the sintering and densification of the oxides. Nd1−xCaxCrO3 with x=0.25 shows the best electrical conductivity of 28.8 and 1.1 S/cm at 850°C in air and hydrogen, respectively, with a high relative density of 98.0% and a good TEC of 9.19 × 10−6 K−1 in the temperature range from 30° to 1000°C in air. This indicates that Nd0.75Ca0.25CrO3 is a promising candidate as an interconnect material for application in SOFCs.
No Supplementary Data
No Article Media
Document Type: Research Article
National Key Laboratory of Superhard Materials, and College of Physics, Jilin University, Changchun 130012, China
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798 Singapore, Singapore
Publication date: October 1, 2009