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Kinetic analysis of the thermal decomposition of iron(III) phosphates: Fe(NH3)2PO4 and Fe(ND3)2PO4

AuthorsIglesias, Isabel; Huidobro, José A.; Alfonso, Belén F.; Trobajo, Camino CSIC ORCID; Espina, Aránzazu CSIC; Mendoza-Meroño, R.; García, José R. CSIC ORCID
KeywordsMetal phosphates
Hydrothermal synthesis
Crystal structure
Thermal decomposition
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationInternational Journal of Molecular Sciences 21(3): 781 (2020)
AbstractThe hydrothermal synthesis and both the chemical and structural characterization of a diamin iron phosphate are reported. A new synthetic route, by using n-butylammonium dihydrogen phosphate as a precursor, leads to the largest crystals described thus far for this compound. Its crystal structure is determined from single-crystal X-ray diffraction data. It crystallizes in the orthorhombic system (Pnma space group, a = 10.1116(2) Å, b = 6.3652(1) Å, c = 7.5691(1) Å, Z = 4) at room temperature and, below 220 K, changes towards the monoclinic system P21/n, space group. The in situ powder X-ray thermo-diffraction monitoring for the compound, between room temperature and 1100 K, is also included. Thermal analysis shows that the solid is stable up to ca. 440 K. The kinetic analysis of thermal decomposition (hydrogenated and deuterated forms) is performed by using the isoconversional methods of Vyazovkin and a modified version of Friedman. Similar values for the kinetic parameters are achieved by both methods and they are checked by comparing experimental and calculated conversion curves.
DescriptionThis article belongs to the Special Issue Solution Chemical Kinetics 2019.
Publisher version (URL)https://doi.org/10.3390/ijms21030781
Appears in Collections:(CINN) Artículos
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