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Article

Kinetic Analysis of the Thermal Decomposition of Iron(III) Phosphates: Fe(NH3)2PO4 and Fe(ND3)2PO4

1
Departamentos de Física, Universidad de Oviedo, 33007 Oviedo, Spain
2
Departamentos de Matemáticas, Universidad de Oviedo, 33007 Oviedo, Spain
3
Departamentos de Química Orgánica e Inorgánica, Universidad de Oviedo-CINN, 33006 Oviedo, Spain
4
Servicios Científico-Técnicos, Universidad de Oviedo, 33006 Oviedo, Spain
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(3), 781; https://doi.org/10.3390/ijms21030781
Received: 20 December 2019 / Revised: 22 January 2020 / Accepted: 23 January 2020 / Published: 25 January 2020
(This article belongs to the Special Issue Solution Chemical Kinetics 2019)
The 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. View Full-Text
Keywords: metal phosphates; hydrothermal synthesis; crystal structure; thermal decomposition; kinetics metal phosphates; hydrothermal synthesis; crystal structure; thermal decomposition; kinetics
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MDPI and ACS Style

Iglesias, I.; Huidobro, J.A.; Alfonso, B.F.; Trobajo, C.; Espina, A.; Mendoza, R.; García, J.R. Kinetic Analysis of the Thermal Decomposition of Iron(III) Phosphates: Fe(NH3)2PO4 and Fe(ND3)2PO4. Int. J. Mol. Sci. 2020, 21, 781. https://doi.org/10.3390/ijms21030781

AMA Style

Iglesias I, Huidobro JA, Alfonso BF, Trobajo C, Espina A, Mendoza R, García JR. Kinetic Analysis of the Thermal Decomposition of Iron(III) Phosphates: Fe(NH3)2PO4 and Fe(ND3)2PO4. International Journal of Molecular Sciences. 2020; 21(3):781. https://doi.org/10.3390/ijms21030781

Chicago/Turabian Style

Iglesias, Isabel; Huidobro, José A.; Alfonso, Belén F.; Trobajo, Camino; Espina, Aránzazu; Mendoza, Rafael; García, José R. 2020. "Kinetic Analysis of the Thermal Decomposition of Iron(III) Phosphates: Fe(NH3)2PO4 and Fe(ND3)2PO4" Int. J. Mol. Sci. 21, no. 3: 781. https://doi.org/10.3390/ijms21030781

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