Thermal synthesis and structural characterization of the orthorhombic Th2(PO4)(P3O10) |
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Authors: | Jorge García-Glez Belén F. Alfonso José A. Huidobro Sergei A. Khainakov Germán R. Castro Camino Trobajo |
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Affiliation: | 1. Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo-CINN, 33006, Oviedo, Spain 2. Departamento de Física, Universidad de Oviedo, 33006, Oviedo, Spain 3. Departamento de Matemáticas, Universidad de Oviedo, 33006, Oviedo, Spain 4. Servicios Científico-Técnicos, Universidad de Oviedo, 33006, Oviedo, Spain 5. SpLine Spanish CRG Beamline at the ESRF, ESRF-BP 220, 38043, Grenoble Cedex, France
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Abstract: | Polycrystalline thorium(IV) phosphate-triphosphate, Th2(PO4)(P3O10) (1), was obtained by (NH4)2Th(PO4)2·H2O (2) heating from room temperature to 1,273 K. 1 crystallizes in the orthorhombic space group Pn21 a (a = 11.6846(2) Å, b = 7.1746(1) Å, c = 12.9320(3) Å, Z = 4). Combining powder synchrotron X-ray diffraction data and DFT geometry optimization, a structural model is proposed for 1. The structure is built on ThO8 polyhedral chains along the b-axis. PO4 3? and P3O10 5? groups coexist in the structure and the latter group forms non-linear chains. Cohesion of the structure is made by the linkage of ThO8 chains by PO4 and P3O10 groups. Thermal transformation from 2 to 1 was monitored by thermogravimetric analysis (activation energy as a function of the extent of conversion was obtained from Kissinger–Akahira–Sunose (KAS) isoconversional method) and powder X-ray thermo-diffraction. For 2, the dehydration process takes place in two steps, with the apparition of a layered intermediate phase, (NH4)2Th(PO4)2·nH2O (0 < n < 1, d = 6.42 Å), previously to the formation of (NH4)2Th(PO4)2 (d = 6.31 Å). The condensation process produces an amorphous material that crystallizes to α-ThP2O7 (3) when the temperature increases. At 1,273 K, 3 slowly transforms to 1. |
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