Columbite structure

[Arbelio Penton Madrigal]

Dear All,
I'm working on PFN ferroelectric ceramics. I need to know the atomic
positions of the coumpond of Fe(NbO3)2, SG: Pbcn (60). It has the
columbite structure.
Thanks
arbelio

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                                Arbelio Penton Madrigal
                                Laboratoro de Analisis Estructural
                                Facultad de Fisica
                                Universidad de La Habana
                                San Lazaro y L, 10400
                                Ciudad de La Habana, Cuba
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