US EPA

8462353 

Journal Article 

Synthesis by solution combustion of inorganic blue pigments MFe2(P2O7)(2): Influence of the cation M (Zn2+, Co2+, Cu2+, and Mg2+) on their optical properties 

Chavarriaga, EA; Lopera, AA; Wermuth, TB; Arcaro, S; Gomez, A; Restrepo, OJ; Alarcon, J; Bergmann, CP; , 

2020 

1 

Solid State Sciences
ISSN: 1293-2558
EISSN: 1873-3085 

ELSEVIER 

AMSTERDAM 

103 

106180 

10.1016/j.solidstatesciences.2020.106180 

WOS:000533573600012 

https://linkinghub.elsevier.com/retrieve/pii/S1293255819308374
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The aim of this work is to find the effect of the cation M (Zn2+, Co2+, Cu2+, and Mg2+) on the optical properties of MFe2(P2O7)(2) synthesized by solution combustion. The crystal structure of the powders was determined by X-ray diffraction (XRD), Infrared spectroscopy (IR), and Raman spectroscopy. The presence of Fe2+ and Fe3+ ions in the pigments was studied using Mossbauer spectroscopy (MS), these spectra showed at 298 K three well-defined Mossbauer doublets belonging to octahedral S1 site and S3 site of Fe3+ and trigonal prismatic S2 site of Fe2+, confirming the formation of ZnFe2(P2O7)(2), CoFe2(P2O7)(2) and MgFe2(P2O7)(2) structures, while in CuFe2(P2O7)(2) there is no presence of trigonal prismatic S2 site of Fe2+ ion. Therefore, the mechanism of color on the ZnFe2(P2O7)(2), CoFe2(P2O7)(2), and MgFe2(P2O7)(2) structures are due to intervalence charge transfer between Fe2+ and Fe3+ ions. In contrast, on the CuFe2(P2O7)(2) structure is due to d-d electronic transitions of the Cu2+ ion, these evidences can also be observed in their UV-Vis diffuse reflectance spectra. Moreover, the inorganic blue pigment MgFe2(P2O7)(2), which is free of cobalt, copper, and zinc could be used as a pigment in applications of low temperatures. 

Solution combustion; Optical properties; Color; Inorganic pigments