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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...
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.
Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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...
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.
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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Related Experiment Video

Updated: May 26, 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

BaFeO3: a ferromagnetic iron oxide.

Naoaki Hayashi1, Takafumi Yamamoto, Hiroshi Kageyama

  • 1Micro/Nano Fabrication Hub, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan. hayashi@sou.mbox.media.kyoto-u.ac.jp

Angewandte Chemie (International Ed. in English)
|December 23, 2011
PubMed
Summary

Researchers discovered a new magnetic material, cubic barium ferrate (BaFeO3). This perovskite exhibits strong ferromagnetism due to enhanced charge transfer, making it a promising material for magnetic applications.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • Perovskite materials are known for diverse electronic and magnetic properties.
  • Understanding the origins of magnetism in transition metal oxides is crucial for developing new magnetic materials.

Purpose of the Study:

  • To synthesize and characterize a novel magnetic perovskite, barium ferrate (BaFeO3).
  • To investigate the mechanism behind the observed ferromagnetism in BaFeO3.

Main Methods:

  • Low-temperature synthesis of cubic BaFeO3 using ozone as an oxidant.
  • Magnetic property measurements to determine magnetic moment and critical field.

Main Results:

  • Successfully synthesized cubic BaFeO3 with a perovskite structure.
  • Observed ferromagnetism with a significant magnetic moment of 3.5 Bohr magnetons per iron ion.
  • Ferromagnetism persists above a critical field of approximately 0.3 Tesla.

Conclusions:

  • The observed ferromagnetism in BaFeO3 is attributed to enhanced oxygen to iron (O→Fe) charge transfer.
  • Deepening of iron (Fe(4+)) d levels plays a key role in strengthening the magnetic properties.
  • BaFeO3 is a promising material for advanced magnetic applications.