The crystal structure of Na2PO3F fl has been studied by X-ray diffraction. This compound is orthorhombic, space group P21212x. The cell dimensions are a = 5.416 _+ 0-003, b = 6.929 +_ 0.004, c = 19.079 + 0.010 A and Z= 8. Data were measured on an automatic diffractometer using Cu K0¢ radiation, 2= 1.5418 A. The structure was established by statistical methods and refined by least-squares analysis using anisotropic thermal parameters. The structure is characterized by two kinds of POaF 2-tetrahedron. The environments of oxygen and fluorine atoms are described. The final R index is 0.052 for 712 observed reflexions.
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