Crystal structure and spiral magnetic ordering of BiFeO 3 doped with manganese

  • Sosnowska I
  • Sch�fer W
  • Kockelmann W
 et al. 
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Neutron powder diffraction has been performed on polycrystalline BiMnxFe1-xO3
(x=0, 0.1 and 0.2). The structures of the doped compounds are described
by the space group R3c of ferroelectric BiFeO3. Refined structure
parameters are presented. Mn doping generates microstructural changes
manifested by broadening in the diffraction patterns. The lattice
parameters show a non-linear behaviour from 4 K to 630 K. Mn doping
results in a transformation of the long-range spiral spin modulation
of BiFeO3 to a collinear antiferromagnetic structure with spins along
c. The average magnetic moments and the ordering temperatures decrease
with increasing Mn concentration.

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  • I. Sosnowska

  • W. Sch�fer

  • W. Kockelmann

  • K.H. Andersen

  • I.O. Troyanchuk

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