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Título: | Thorium(IV) phosphate-triphosphate: A valuable ceramic material obtained by thermal treatment of a layered ammonium-thorium(IV) phosphate. Kinetic analysis of the transformation |
Autor: | Iglesias, Isabel; Alfonso, Belén F.; Amghouz, Zakariae CSIC ORCID; Trobajo, Camino CSIC ORCID; García, José R. CSIC ORCID; Huidobro, José A. | Palabras clave: | Radionuclides immobilization Kinetics Thorium phosphates Thermal decomposition |
Fecha de publicación: | 2017 | Editor: | Elsevier | Citación: | Ceramics International 43(14): 10776-10783 (2017) | Resumen: | Morphological and structural characterization of both (NH4)2Th(PO4)2·H2O (1) and Th2(PO4)(P3O10) (2) have been performed by using electron microscopy techniques (SEM, HR-TEM, DF-STEM and SAED), which reveal a morphological transformation from star-shaped particles to irregularly rhombohedral-like aggregates after thermal treatment at 1000 °C. The 1 → 2 thermal conversion is monitored by thermogravimetric analysis and the activation energy has been obtained by using isoconversional methods. A discrete model describing the kinetic process is obtained and so the original data set can be reconstructed and compared with the experimental measures. By using heating rates different from those involved for getting the model, predictions can be also made. The procedure has worked efficiently in recovering the original kinetic parameters in two theoretical simulations. | URI: | http://hdl.handle.net/10261/173292 | DOI: | 10.1016/j.ceramint.2017.05.091 | Identificadores: | doi: 10.1016/j.ceramint.2017.05.091 issn: 0272-8842 e-issn: 1873-3956 |
Aparece en las colecciones: | (CINN) Artículos |
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