Samarium ultraphosphate, SmPsO~4, crystallizes in the monoclinic system, space group P21/b with unit-cell parameters a = 8.750 _+ 0.004, b = 12.990 + 0.006, c = 8.944 + 0.004 .~, 7 = 90 .450 + 0-1, and four molecules per unit cell. the structure has been solved by three-dimensional Patterson synthesis and refined by least-squares analysis (R=0.05). The anionic group PsO14 is formed by two zigzag chains of PO4 tetrahedra and two chains are linked together by the Sm cations which have been found to have eight oxygen neighbours.

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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.

Abstract. Mr=297.8 , orthorhombic, Fdd2, a= 19.440 (5), b= 19.027 (5), c= 13.222 (5)/~, V= 4891(4) /~), Z=32, Dx=3.235Mgm -3, AgKfi, 2 = 0.5608 A, # = 3.417 mm -1, F(000) = 4352, T= 298 K, R = 0.042 for 2027 independent reflexions. The (POa)oo chains run along the e direction with a period of eight tetrahedra. The Cs(1)O 8 polyhedra alternate with the Cs(2)Os polyhedra through corner-sharing and face-sharing and form chains running along e. Such chains are connected together by sharing common edges of Cs(1)O 8 polyhedra in such a way that they form layers perpendicular to the b axis. These layers are linked together by the LiO 4 tetrahedra.

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