Abstract
The crystal and magnetic structures of BiFeO${}_{3}$ have been studied at high pressures up to 8.6 GPa by means of neutron powder diffraction at ambient temperature. Upon compression, a reduction of the spontaneous ferroelectric polarization is evidenced from the analysis of atomic displacements in the rhombohedral phase. A structural phase transition from the polar rhombohedral $R$3$c$ phase to the antipolar orthorhombic Pbam phase with antiferroelectic character of atomic displacements was revealed at $P$ = 3 GPa. The lattice parameters of the Pbam phase at $P$ = 4.1 GPa are $a$ = 5.5177(4), $b$ = 11.159(1) and $c$ = 7.7550(6) \AA{}. The variation of the structural parameters of both phases as a function of pressure was determined. The initially incommensurate G-type antiferromagnetic structure of BiFeO${}_{3}$ becomes commensurate due to the structural phase transition.
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