Crystal structure / Polyphosphate / Ba2Li3(P03)7Abstract. Crystal chemistry and crystal structure are given for the bariumlithium polyphosphate Ba2Li3(P03)7. This new compound is monoclinic P2Ja with: a = 18.014(8), b = 8.535(3), c= 11.584(5) A, ft = 104.48(2)°, Z = 4, V= 1724.46 A3, and 73x = 3.269 Mg/m3. Its crystal structure has been determined using 6755 reflections and refined with a final R value 0.036 for 3038 reflections. Ba2Li3(P03)7 provides the first example of a (P03)^c hain with a period of 14 tetrahedra.

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