Abstract
Abstract The series of solid solutions Y[Fe 1− x Co x (CN) 6 ]·4H 2 O (0 ⩽ x ⩽ 1) were prepared and characterized by means of powder X-ray diffraction (PXRD), Infrared and Mossbauer spectroscopy and magnetic measurements. The thermal decomposition process has been followed by thermogravimetric and differential thermal analysis (TGA–DTA). The crystal structure of the complexes was refined by means of Rietveld analysis. The Y[Fe 1− x Co x (CN) 6 ]·4H 2 O complexes crystallize in the orthorhombic crystal system, space group Cmcm . The Y 3+ ion is eight-coordinated forming a bicapped distorted trigonal prism YN 6 O 2 . The Fe 3+ and Co 3+ ions are six-coordinated in the form of an irregular octahedra (Fe,Co)C 6 group and cyanide linkages between YN 6 O 2 and (Fe,Co)C 6 groups build an infinite polymeric array. The Mossbauer spectra of all solid solutions Y[Fe 1− x Co x (CN) 6 ]·4H 2 O present quadrupolar splittings with negative isomer shifts values due to the existence of a strong π back-bonding effect from the Fe 3+ ion towards the CN ligands. All compounds follow the Curie–Weiss law showing anti-ferromagnetic interactions at very low temperatures.
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