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Figure 2
Schematic of the electric dipole configuration of Bi2SiO5 based on the polarization obtained by the ECD/EP method. (a) Three-dimensional electric dipole configuration with atom positions. (b) Schematics of dipole ordering for SiO3, Bi(b)–O(b) and Bi(a)–O(c). (c) Schematic dipole ordering showing a weak-ferroelectric configuration of the Bi2O2 layer. The residual dipole in the Bi2O2 layer is aligned antiparallel to the large dipole in the SiO3 layer showing the ferrielectric configuration.

IUCrJ
Volume 1| Part 3| April 2014| Pages 160-164
ISSN: 2052-2525
doi:10.1107/S2052252514008008