Enhancement of ionic conductivity in La_2Mo_2O_9-based nanocrystalline films synthesized by a PVP assisted sol-gel method

摘要

High-quality 5% W- and Gd-doped La_2Mo_2O_9 nanocrystalline films were successfully synthesized on poly-alumina substrates via a PVP-assisted sol-gel method with inorganic salts as precursors, combined with the rapid thermal annealing and novel three stages annealing procedures. Dense and uniform La_2Mo_2O_9-based films with 90 nm in grain size and 1 μm in thickness were obtained by only twice spin coatings and sintering at 600°C. The electrical conductivity of the films at 600°C reaches 0.028 and 0.025 S/cm for W- and Gd-doped samples, respectively.