Related Experiment Video
Updated: Jul 7, 2026
12:20
Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
Published on: October 5, 2013
Ba2F2Fe2+ 0.5Fe3+ S3: a two-dimensional inhomogeneous mixed valence iron compound
Houria Kabbour1, Laurent Cario
1Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière B.P. 32229, 44322 Nantes Cedex 3, France. h.kabbour@fkf.mpg.de
Inorganic Chemistry
|February 2, 2008
Summary
Researchers discovered a new mixed valence iron compound, Ba2F2Fe1.5S3, featuring unique [Fe1.5S3]2- blocks. Preliminary tests indicate low-dimensional antiferromagnetic behavior in this novel material.
Area of Science:
- Solid-state chemistry
- Materials science
- Crystallography
Background:
- Mixed valence compounds offer unique electronic and magnetic properties.
- Understanding novel structural motifs is key to discovering new materials.
Purpose of the Study:
- To determine the crystal structure of the new compound Ba2F2Fe1.5S3.
- To characterize the structural features and iron valence states within the new blocks.
- To investigate the preliminary magnetic properties of the compound.
Main Methods:
- Single crystal X-ray diffraction analysis was employed to solve the crystal structure.
- The crystal system, space group, and cell parameters were determined.
- Preliminary magnetic susceptibility measurements were conducted.
Main Results:
- The compound Ba2F2Fe1.5S3 crystallizes in an orthorhombic cell (space group Pnma) with specific lattice parameters.
- The structure consists of alternating fluorite-type [Ba2F2]2+ and novel [Fe1.5S3]2- blocks.
- The [Fe1.5S3]2- blocks exhibit iron mixed valence, with Fe(II) in octahedral and Fe(III) in tetrahedral coordination.
Conclusions:
- The crystal structure of Ba2F2Fe1.5S3 was successfully elucidated, revealing a novel stacking arrangement.
- The mixed valence iron sites within the [Fe1.5S3]2- blocks are structurally distinct.
- Preliminary magnetic data suggest potential low-dimensional antiferromagnetic behavior requiring further investigation.
More Related Videos
Related Concept Videos
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
02:45Valence Bond Theory
Overview of Valence Bond Theory
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
03:45Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
02:48Ionic Bonding and Electron Transfer
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.