Accurate crystal structure determination of complex phosphate Mg-fillowite?Na2Ca(Mn4Mg2Fe)7[PO4]6 has been finished.Mg-fillowite occurs in muscovite-pegmatite in the Altay area,Xinjiang,China.It is of the trigonal lat...Accurate crystal structure determination of complex phosphate Mg-fillowite?Na2Ca(Mn4Mg2Fe)7[PO4]6 has been finished.Mg-fillowite occurs in muscovite-pegmatite in the Altay area,Xinjiang,China.It is of the trigonal lattice,with space group R-3,unit cell a=1.5143(3)nm,c=4.3191(2)nm,V=8.5736 nm3,Z=18.The R-factor of the determination accuracy is R(I>2σ(I))=0.0776.The cationic polyhedra consist of two kinds of structural units:compound col-umn and screw column.In three-dimensional space,they are linked with each other through corner sharing or edge sharing to build the entire structure.There are 45 atoms in an asymmetric unit and 720 atoms in a unit cell.In terms of types and connection manners of the coordination polyhedra,the degree of complicity is rarely seen in all mineral crystal structures.Study of such a structure is significant for the classification of phosphate and the building rule of coordination polyhedra in a complex crystal structure.展开更多
基金supported by the National Natu-ral Science Foundation of China(Gant Nos.40242013 and 40472025).
文摘Accurate crystal structure determination of complex phosphate Mg-fillowite?Na2Ca(Mn4Mg2Fe)7[PO4]6 has been finished.Mg-fillowite occurs in muscovite-pegmatite in the Altay area,Xinjiang,China.It is of the trigonal lattice,with space group R-3,unit cell a=1.5143(3)nm,c=4.3191(2)nm,V=8.5736 nm3,Z=18.The R-factor of the determination accuracy is R(I>2σ(I))=0.0776.The cationic polyhedra consist of two kinds of structural units:compound col-umn and screw column.In three-dimensional space,they are linked with each other through corner sharing or edge sharing to build the entire structure.There are 45 atoms in an asymmetric unit and 720 atoms in a unit cell.In terms of types and connection manners of the coordination polyhedra,the degree of complicity is rarely seen in all mineral crystal structures.Study of such a structure is significant for the classification of phosphate and the building rule of coordination polyhedra in a complex crystal structure.
