CRYSTAL STRUCTURES OF DOUBLE TETRAMETAPHOSPHATES Li2Мn(PO3)4

Анотація

The progress of inorganic chemistry is syntheses of new phosphates.

We learned of structure of new double phosphate Li₂Mn(PO₃)₄ by RSA methods. This phosphate is obtained from lows of systems Li₂O-P₂O₅.

RSA of white crystals ortorombic gabitus with parametrs 0,2х0,019х0,2 mm study on difractometr "Siemens P3/PC" in carbon monocromator. Structure of Li₂Mn(PO₃)₄ is ortor. syng., Рnmа, parametrs of frame: a=9,268(1), b=9,421(1), c=10,088(1) A, V=880,9 A³, Z=4, rcal_.=2,901 g/sm³.

The atomic coordinates of were used as starting parameters for structure refinements. The Mn cations were placed in the M(5) site. Alkali metal cations were placed in the M(4) site as it was obtained. The structure refinements in these models gave a good agreement between the observed and calculated patterns and reasonable values of isotropic thermal atomic parameters for all cations. Final plots of observed electron density maps did not show residual peaks.

The polyedrs [MnO₆] have two equivalent bonds Mn-O(4) and Mn-O(5) with long 2,261 A and 2,198 A. All atoms of oxygen of polyedres [MnO₆] have contacts with four tetraedrs P(2)O₄ through atoms O(5) and О(4), with tetraedrs P(1)O₄ and Р(3)О₄ through atoms О(7) and О(8).