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Abstract
The crystal and magnetic structures of ${\text{BiMnO}}_{3}$ were studied at high pressures up to 10 GPa by means of neutron diffraction in the temperature range 2--300 K. Three structural modifications, two monoclinic and one orthorhombic were found to exist in the pressure range studied and their structural parameters were determined. A suppression of the initial ferromagnetic state and formation of a new antiferromagnetic state with a propagation vector (1/2 1/2 1/2) was observed at $P\ensuremath{\sim}1\text{ }\text{GPa}$, accompanied with the monoclinic-monoclinic structural transformation. Possible mechanisms of the pressure-induced magnetic transition and origin of magnetoelectric phenomena in ${\text{BiMnO}}_{3}$ are discussed.
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