Aqueous Combustion Synthesis of Strontium‐Doped Lanthanum Chromite Ceramics

Abstract

An aqueous combustion synthesis is used to produce powders of La 0.8 Sr 0.2 CrO 3 perovskite. It is shown that interaction between chromium nitrate and glycine controls the process. In addition, it is suggested that glycine reacts with products of nitrate decomposition to yield an intermediate compound, which decomposes exothermically providing high‐temperature conditions for complex oxide formation. It is remarkable that although reaction temperature is high (up to 800°C) and characteristic time is small (∼1 s) for synthesis under the self‐propagating high‐temperature mode, the produced perovskites have high specific surface area (∼40 m 2 /g) and well‐defined crystalline structure. As a result, ceramics sintered by using these powders are dense (∼96% of theoretical) and possess high electronic and low ionic conductivities, important for interconnect applications in solid oxide fuel cells.