Crystal structure and Mössbauer effect investigation of FeVO4

Structure du vanadate d'indium: InVO4

“…Cependant c'est la structure de CrVO 4 (Wyckoff, 1965) En plus de T1VO 4 qui semble isotype et isostructural de InVO 4 (Touboul & Ingrain, 1980), un autre vanadate d'un ~l~ment trivalent de cette colonne est signal~, c'est A1VO4; celui-ci pr~sente une sym~trie triclinique (Baran & Botto, 1977) et n'a pas fait l'objet d'une 6tude structurale compl6te. Cependant il est isotype et isostructural de FeVO4 dont la structure a ~t6 d~termin~e par Robertson & Kostiner (1972). On trouve deux ions Fe 3+ entour~s d'oxyg~nes formant des octa~dres irr~guliers, les valeurs des distances Fe--O allant de 1,969 h 2,114 A; un autre Fe 3+ a cinq oxyg~nes voisins de 1,869 h 2,018 A, qui forment une bipyramide trigonale.…”

Lithium insertion chemistry of some iron vanadates

“…FeVO 4 -I was first isolated by Levinson et al. [16], and its crystal structure was reported by Robertson et al [17]. The structure consists of a 3-D packing of VO 4 tetrahedra, FeO 6 octahedra and FeO 5 trigonal bipyramids.…”

Electron spin resonance of FeVO4

“…From Moessbauer data [1] we can expect that the main line is due to Fe 3+ ions. We fitted the ESR signal according to the following equation [12]:…”

“…Single crystals of FeVO 4 were grown in the Institute of Physics, Szczecin University of Technology, by a standard melt method described previously in [1]. A mixture of high-purity reagents of Fe 2 O 3 (4N) and V 2 O 5 (4N) in molar ratio 1:2 was packed into a platinum crucible and then the crucible was put into a homemade electric furnace with an adjustable temperature gradient.…”

“…FeVO 4 is a low symmetry magnetic system undergoing antiferromagnetic phase transition at T N = 20 K. The crystal structure is triclinic with space group P1, with lattice parameters a = 0.6719 nm, b = 0.8060 nm, c = 0.9254 nm, α = 96.65°, β = 106.57°, γ = 101.60° [1]. It has also high-pressure metastable phases FeVO 4 -II, crystallizing in orthorhombic Cmcm system, FeVO 4 -III, crystallizing in orthorhombic Pbcn system and FeVO 4 -IV, crystallizing in monoclinic wolframite P2/C system [2].…”