The paper reports a new, nonconventional method for the preparation of oxygen-containing niobium compounds, based upon coprecipitation.
The coprecipitation product of niobic acid with lead oxalate was used as precursor. Lead metaniobate was obtained by proper
thermal treatment of the coprecipitate. The coprecipitate mechanism was studied and the optimal conditions for quantitative
precipitation of niobium and lead were established. The mechanism of thermal decomposition of the coprecipitate was investigated
by differential thermal analysis and X-ray powder diagrams. The final product of thermal decomposition, lead metaniobate,
is formed at 850C.