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Hydrothermal synthesis, crystal structure, thermal behaviour and magnetic properties of a new ammonium-chromium-iron(III) bis(hydrogenphosphate)

AuthorsIglesias, Isabel; Alfonso, Belén F.; Trobajo, Camino ; Huidobro, José A.; Amghouz, Z.; Martínez-Blanco, David; Blanco, Jesús A.; García, José R.
KeywordsMetal phosphates
Hydrothermal synthesis
Crystal structure
Thermal decomposition
Magnetic properties
Issue Date2019
CitationJournal of Solid State Chemistry 269: 72-79 (2019)
AbstractThe hydrothermal synthesis and the chemical-physical characterization of an ammonium-chromium(III)-iron(III) bis(hydrogenphosphate), Cr0.34Fe0.66NH4(HPO4)2 [CrFeNP] is reported. It was obtained in aqueous media by reaction between chromium(III) chloride, iron(III) chloride, urea, and orthophosphoric acid. The crystal structure of CrFeNP was determined from single-crystal X-ray diffraction data. It crystallizes in the triclinic system, space group P-1, and exhibits two types of different infinite tunnels along [0 1 0] and [1 0 0] directions, where the ammonium cations are located. Thermal analysis shows that the solid is stable up to ca. 600 K. The activation energy of the thermal decomposition up to 1273 K was computed by isoconversional methods. In addition, the magnetic behaviour of the material was investigated from magnetic susceptibility and magnetization measurements. CrFeNP undergoes two successive magnetic transitions at temperatures  Tc = 17. 9 K and  Tt = 3.1 K, which could be related to a ferri- and an antiferromagnetic magnetic phase transitions, respectively.
Publisher version (URL)https://doi.org/10.1016/j.jssc.2018.09.015
Identifiersdoi: 10.1016/j.jssc.2018.09.015
issn: 0022-4596
Appears in Collections:(CINN) Artículos
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