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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Colors and Magnetism03:02

Colors 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.
Ferrocement01:30

Ferrocement

Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
Diamagnetism01:26

Diamagnetism

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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Valence Bond Theory02:42

Valence 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...

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Related Experiment Video

Updated: May 14, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Manganese Ferrite Containing Glass-Crystalline Materials-Phase Composition, Microstructure and Magnetic Properties.

Petar Takov1, Ruzha Harizanova1, Irena Mihailova2

  • 1Physics Department, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Blvd., 1756 Sofia, Bulgaria.

Materials (Basel, Switzerland)
|May 13, 2026
PubMed
Summary

Researchers synthesized novel glass-crystalline magnetic materials for electronics. These materials exhibit ferrimagnetic properties, showing potential for advanced applications.

Keywords:
Mössbauer spectroscopyRaman spectroscopyX-ray diffractioncrystallizationferrimagnetismmagnetitemagnetometrymanganese ferritescanning electron microscopyvalence state

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • New magnetic materials are crucial for developing advanced electronic components.
  • The Na2O-MnO-SiO2-Fe2O3 system offers potential for novel magnetic material synthesis.

Purpose of the Study:

  • To synthesize and characterize glass-crystalline magnetic materials in the Na2O-MnO-SiO2-Fe2O3 system.
  • To investigate the phase composition, microstructure, and magnetic properties of these materials.

Main Methods:

  • Melt-quenching technique for material synthesis.
  • X-ray diffraction and Raman spectroscopy for phase analysis.
  • Scanning electron and optical microscopy for microstructural investigation.
  • Mössbauer spectroscopy for iron ion coordination.
  • Vibrating sample magnetometry for magnetic property assessment.

Main Results:

  • Monophase MnxFe3-xO4 solid solutions were successfully precipitated.
  • Microstructure analysis revealed bulk crystallization with polygon-shaped and dendritic crystals.
  • Mössbauer spectra indicated Fe3+ ions in tetrahedral coordination and in MnxFe3-xO4 solid solutions.
  • Materials exhibited ferrimagnetic properties at room temperature.

Conclusions:

  • The synthesis yielded glass-crystalline materials with potential magnetic applications.
  • The materials contain MnFe2O4 (jacobsite) and Mn-containing Fe3O4 (magnetite) solid solutions.
  • The observed ferrimagnetism makes these materials promising for electronic devices.