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Investigations of the quasi-ternary system Na 3 PO 4 –Mg 3 (PO 4 ) 2 –NdPO 4  allowed us to obtain the new phosphate hepta­sodium trideca­magnesium neodymium dodeca­kis­phosphate, Na 7 Mg 13 Nd(PO 4 ) 12 , by applying a flux method. The crystal structure is isotypic with that of the previously reported Na 7 Mg 13   Ln (PO 4 ) 12  ( Ln  = Eu, La) compounds. It consists of a complex three-dimensional framework built up from an NdO 8  polyhedron ( m  symmetry), an  M O 6  octa­hedron statistically occupied by  M  = Mg and Na, and eight MgO  x   ( x  = 5, 6) polyhedra (four with site symmetry  m ), linked either directely by sharing corners, edges and faces, or by one of the eight unique PO 4  tetra­hedra through common corners. Two of the PO 4  tetra­hedra are statisticaly disordered over a mirror plane. The whole structure can be described as resutling from an assembly of two types of structural units,  viz  [Mg 4   M P 4 O 22 ] ∞   2  layers extending parallel to (100) and stacked along [100], and [Mg 4 NdP 4 O 36 ] ∞   1  undulating chains running along the [010] direction. The six different Na +  cations (five with site symmetry  m  and one with 0.5 occupancy) are situated in six distinct cavities delimited by the framework. The structure was refined from data of a racemic twin.

Na7Mg13Nd(PO4)12

Na₇Mg₁₃Nd(PO₄)₁₂