Article

Lutetium(III) cyclo-tetra-phosphate.

Acta Crystallographica Section E Structure Reports Online (Impact Factor: 0.35). 01/2010; 66(Pt 6):i46. DOI: 10.1107/S1600536810016363
Source: PubMed

ABSTRACT Single crystals of the title compound, tetra-lutetium(III) tris-(cyclo-tetra-phosphate), Lu(4)(P(4)O(12))(3), were obtained by solid-state reaction. The cubic structure is isotypic with its Al(III) and Sc(III) analogues and is built up from four-membered (P(4)O(12))(4-) phosphate ring anions ( symmetry), isolated from each other and further linked through isolated LuO(6) octa-hedra (.3. symmetry) via corner sharing. Each LuO(6) octa-hedron is linked to six (P(4)O(12))(4-) rings, while each (P(4)O(12))(4-) ring is linked to eight LuO(6) octa-hedra.

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    ABSTRACT: A new compound, thulium cyclotetraphosphate Tm4(P4O12)3, has been synthesized in the system Tm2O3–P2O5–H2O at the temperature of 400 ºC and at the molar ratio Tm : P = 1 : 5. X-ray studies have been performed for powder samples of Tm4(P4O12)3: cubic system, space group I–43d, a = 14,7606(5) Å. Thermal behaviour of the compound has been investigated within the temperature range of 30–1500 ºC. It is found that the compound demonstrates high thermal stability. It decomposes only above the temperature of 1200 ºC. Its melting tempera-ture is 1440 ºC. An additional endothermic peak on the DSC curve in the temperature range of thulium cyclotetraphosphate melting is explained by physical displacement of the sample to the crucible centre under the influence of surface tension forces. (in Russian)
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