Na₇Mg₁₃Nd(PO₄)₁₂

Abstract

Investigations of the quasi-ternary system Na3PO4–Mg3(PO4)2–NdPO4 allowed us to obtain the new phosphate hepta­sodium trideca­magnesium neodymium dodeca­kis­phosphate, Na7Mg13Nd(PO4)12, by applying a flux method. The crystal structure is isotypic with that of the previously reported Na7Mg13 Ln(PO4)12 (Ln = Eu, La) compounds. It consists of a complex three-dimensional framework built up from an NdO8 polyhedron (m symmetry), an MO6 octa­hedron statistically occupied by M = Mg and Na, and eight MgOx (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 PO4 tetra­hedra through common corners. Two of the PO4 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 [Mg4 MP4O22]∞ 2 layers extending parallel to (100) and stacked along [100], and [Mg4NdP4O36]∞ 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.

Optimization of Cell Adhesion on Mg Based Implant Materials by Pre-Incubation under Cell Culture Conditions

“…A further interesting observation is that there is a similar distribution of Na and Nd, which could indicate that during the corrosion process new complex phases could be formed. This could be e.g., the formation of Na 7 Mg 13 Nd(PO 4 ) 12 , which was recently crystallized from a solution containing Na 2 CO 3 , MgCO 3 , Nd 2 O 3 , NH 4 H 2 PO 4 , [ 46 ] which are all ingredients of cell culture medium (except for Nd, which is derived from the alloy).…”

Synthesis and crystal structure of a new magnesium phosphate Na3RbMg7(PO4)6

“…All of them crystallize with trigonal symmetry (space group R3) and differ only by their cationic distributions. Three-dimensional anionic networks includes also original structures such as those observed in Na 18 Ca 13 Mg 5 (PO 4 ) 18 , NaCa 9 Mg(PO 4 ) 7 , Na 7 LnMg 13 (PO 4 ) 12 (Ln = La, Eu, Nd) (Yamakawa et al, 1994;Morozov et al, 1997;Jerbi et al, 2010bJerbi et al, , 2012.…”