Ba2-xLaxSnO4+δ layered barium stannate materials: Synthesis, electronic transport, and chemical stability

The design and synthesis of new solid oxide materials are important areas in both fundamental and applied chemistry. In the present work, we consider weakly studied Ba2SnO4 layered materials for high-tempera -ture applications. The Ba2-xLaxSnO4+delta (x = 0.05 and 0.1) samples were prepared according to the conven-tional solid-state synthesis method followed by sintering at 1150-1200 degrees C. Although a single-phase state was achieved for all the studied compositions, the decomposition of the layered phases into individual oxides (BaO, SnO2/SnO and La2O3) following their long-term storage even under ambient conditions can be explained in terms of their interactions with gas components (H2O and CO2). Nevertheless, the chemical stability of Ba2-xLaxSnO4+delta was slightly improved by La-doping. The electrical characterisation indicated that Ba2SnO4 at 700-900 degrees C is an n-and p-type conductor with negligible oxygen ionic conductivity. Ba2SnO4 thus represents a relevant research object for fundamental and applied sciences when solving issues with its unsatisfactory chemical stability.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The design and synthesis of new solid oxide materials play an important role in both fundamental and applied chemistry. This study focuses on the application of weakly studied Ba2SnO4 layered materials at high temperatures, and finds that the chemical stability of Ba2SnO4 can be slightly improved by La-doping.