Pages: 10-17

Abstract

The X-ray diffraction structural study showed that the cyclotetraphosphate of manganese, Mn₂P₄O₁₂ crystallizes in the monoclinic system, Z = 4, with space group C_2/c (C⁶_2h), with the following lattice parameters: a = 11.883 (1) Å - b = 8.588 (2) Åc = 10.137 (1) Å, β = 119.21 (2) °. The crystal lattice contains 4 cycles P₄O₁₂^4- with symmetry C_i. All the atoms occupy the sites " 8f " of symmetry C₁ except manganese Mn atoms, which are non equivalent, half occupy the 4 sites "e" of  symmetry C_i and the other half occupy the 4 sites "d" of symmetry C₂.