Synthesis and Stability of Nanocrystalline Lead Stannate

Nano‐crystalline PbSnO 3 was synthesized by a sol–gel route. It was an anion‐deficient pyrochlore ( a = b = c = 1.0677 nm) with space group Fd3m. TEM images confirmed the nano‐size of particles as ∼10 nm, aggregated into larger clusters up to 1 μm. DSC‐TGA investigation revealed that the PbSnO 3 was unstable >800°C with 2.95% weight loss. The products of the reactions, Pb 2 SnO 4 and SnO 2 , were identified by in situ high‐temperature XRD. The complex decomposition reactions were deduced as (2 + x )PbSnO 3 = Pb 2 SnO 4 + (1 + x )SnO 2 + x PbO ( x = 0.104). The lattice parameters of PbSnO 3 were determined by high‐temperature XRD. The cell volume of PbSnO 3 increased with increasing temperatures. The average volumetric thermal expansion of PbSnO 3 was calculated as (β= 3.35 × 10 −5 /°C).