The crystal structure of calcium niobate (CaNb2O6)

Calcium niobate, CaNb2O6, crystallizes in the.;pace group Pbcn. The lattice parameters are: a=14.926 +/- 0.004 angstrom; b=5.752 +/- 0.004A; and c=5.204 +/- 0.004 angstrom. The measured density using the displacement method was 4.70 g/cc and the density calculated assuming four formula weights per unit cell was 4.78 g/cc. The structure was determined by the heavy atom method, and the R value is 6.7 percent for 018 observed reflections. The structure consists of calcium and niobiurn atoms surrounded by oxygen atoms in a polyhedral arrangement. The polyhedra share corners and edges to form a chain-like network throughout the solid.