title: Ba2F2Fe(1.5)Se3: An Intergrowth Compound Containing Iron Selenide Layers.
abstract: The iron selenide compound Ba2F2Fe(1.5)Se3 was synthesized by a high-temperature ceramic method. The single-crystal X-ray structure determination revealed a layered-like structure built on [Ba2F2](2+) layers of the fluorite type and iron selenide layers [Fe(1.5)Se3](2-). These [Fe1.5Se3](2-) layers contain iron in two valence states, namely, Fe(II+) and Fe(III+) located in octahedral and tetrahedral sites, respectively. Magnetic measurements are consistent with a high-spin state for Fe(II+) and an intermediate-spin state for Fe(III+). Moreover, susceptibility and resistivity measurements demonstrate that Ba2F2Fe(1.5)Se3 is an antiferromagnetic insulator.
authors.affiliation: Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes , 2 rue de la Houssinière, BP3229, 44322 Nantes, France.
authors.forename: Dalel
authors.initials: D
authors.lastname: Driss
authors.affiliation: Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes , 2 rue de la Houssinière, BP3229, 44322 Nantes, France.
authors.forename: Etienne
authors.initials: E
authors.lastname: Janod
authors.affiliation: Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes , 2 rue de la Houssinière, BP3229, 44322 Nantes, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Corraze
authors.affiliation: Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes , 2 rue de la Houssinière, BP3229, 44322 Nantes, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Guillot-Deudon
authors.affiliation: Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes , 2 rue de la Houssinière, BP3229, 44322 Nantes, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Cario