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Single crystals of the new monophosphate Nb 0.787 W 0.213 OPO 4  both with Nb(V) and W(V), have been isolated. This phase is close to  α -NbOPO 4  but crystallizes in a different space group ( P 4/ nmm ) with  a  = 6.3524(7) Å and  c  = 4.0916(5) Å. The structure consists of a random stacking of two kinds of layers along  c , named  α  and  α ′ built up of [MPO 8 ] ∞  chains running along  a . The first kind of layer ( α ) is identical to that observed for  α -NbOPO 4 , whereas the second kind ( α ′) corresponds to the enantiomorphous form  α ′-NbOPO 4  that has never been observed. It is because such layers are only linked through the apical oxygen atoms of the [MO 6 ] octahedra that their assemblage is made possible, so that this new phase can be considered as a  α - α ′ racemic structure.

Combination of α -NbOPO 4 type layers with enantiomorphic α ′-type layers: the “racemic structure” of α - α ′-Nb 0.787 W 0.213 OPO 4