After a short introduction relating the evolution of ultraphosphate chemistry along time we report what is the present state of our knowledge of this chemistry, giving as completely as possible the main crystallographic features of all the today known ultraphosphates. Then we describe what are the atomic frameworks of these very complex phosphoric anions. A short survey of the abundant literature induced by the discovery of the interesting properties of the lanthanide ultraphosphates as efficient laser materials is also given.
Inorganic dipolyphosphates / P^CoCPJOT^ / Nb 2 Mg(P 2 0 7 )3 / Crystal structure Abstract Chemical preparations and crystal structures of two new diphosphates Nb 2 Co(P 2 0 7 ) 3 and Nb 2 Mg(P 2 0 7 ) 3 are reported. These two salts are isotypic, space group Pljn, Z = 2, cell constants: a= 15.36(1), b = 7.930(5), c = 6.487(5) k,ß = 90.51(1)° for the magnesium salt and a = 15.32(1), b = 7.890(5), c = 6.490(5), β = 90.76(1)° for the cobalt salt.The crystal structures of the two compounds have been solved and refined to R = 0.043 with 1289 hkl for Nb 2 Co(P 2 0 7 ) 3 and R = 0.023 with 1590 hkl for Nb 2 Mg(P 2 0 7 ) 3 . Independent NbO ö and MgO e octahedra are interconnected by the P 2 0 7 groups. For the magnesium salt, one observes the existence of a partial disorder between niobium and divalent atoms. This new type of structure derives clearly from that of the well-known M^PZOT series.
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