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Ferromagnetism01:31

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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...
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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...
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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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...
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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Ag2Cu3Cr2O8(OH)4: a new bidimensional silver-copper mixed-oxyhydroxide with in-plane ferromagnetic coupling.

Nieves Casañ-Pastor1, Jordi Rius1, Oriol Vallcorba2

  • 1Institut de Ciencia de Materials de Barcelona, CSIC, Campus UAB, Bellaterra 08193, Spain. nieves@icmab.es.

Dalton Transactions (Cambridge, England : 2003)
|January 4, 2017
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A new silver-copper-chromium oxyhydroxide, Ag2Cu3Cr2O8(OH)4, exhibits unique high-temperature ferromagnetism due to bidimensional Cu-O-Cu correlations. This discovery expands understanding of silver

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • Layered mixed oxides offer tunable electronic and magnetic properties.
  • Silver-copper oxides are a recent family of materials with diverse behaviors.

Purpose of the Study:

  • To synthesize and characterize a novel Ag-Cu-Cr-O layered mixed oxide.
  • To investigate its crystallographic structure, electronic state, and magnetic properties.

Main Methods:

  • Soft hydrothermal heterogeneous reactions for synthesis.
  • High-resolution powder X-ray diffraction for structural analysis.
  • Density functional theory (DFT) calculations for structural and electronic support.
  • X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) for electronic state determination.

Main Results:

  • A new triclinic oxyhydroxide phase, Ag2Cu3Cr2O8(OH)4, was successfully synthesized and its structure solved.
  • Electronic structure confirmed Ag+, Cu2+, and Cr6+ oxidation states.
  • Observed unique bidimensional Cu-O-Cu ferromagnetic correlations at higher temperatures than similar compounds.
  • DFT calculations indicated electronic states primarily from Cu and OH orbitals, with minimal Ag contribution.

Conclusions:

  • The new Ag-Cu-Cr-O phase exhibits distinct magnetic properties attributed to its layered structure and chromate anions.
  • Silver's role in inducing bidimensionality in copper oxides is further highlighted.
  • The findings contribute to understanding structure-property relationships in layered silver-copper oxides.