Selected area electron diffraction and high resolution electron microscopy
have been used to study the room temperature-stable polymorph of the Bi4V2O
10 phase. The reciprocal lattice, as well as the unit cell symmetry and the
microstructural features, are in agreement with the P22(1)2(1) space group
and a disordered distribution of anionic vacancies in the perovskite-type
layers of the structure.