Antipolar phase in multiferroic BiFeO 3 at high pressure
作者： DP Kozlenko , AA Belik , AV Belushkin , EV Lukin , WG Marshall
DOI: 10.1103/PHYSREVB.84.094108
关键词:
摘要: The crystal and magnetic structures of BiFeO${}_{3}$ have been studied at high pressures up to 8.6 GPa by means neutron powder diffraction ambient temperature. Upon compression, a reduction the spontaneous ferroelectric polarization is evidenced from analysis atomic displacements in rhombohedral phase. A structural phase transition polar $R$3$c$ antipolar orthorhombic Pbam with antiferroelectic character was revealed $P$ = 3 GPa. lattice parameters 4.1 are $a$ 5.5177(4), $b$ 11.159(1) $c$ 7.7550(6) \AA{}. variation both phases as function pressure determined. initially incommensurate G-type antiferromagnetic structure becomes commensurate due transition.
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