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Room-Temperature Ferromagnetism in an Iron-Based Zeolitic Imidazolate Framework Glass
Chaohui Guo1, Xuan Ge2, Ang Qiao1
1State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 24, 2025
Summary
Researchers discovered room-temperature weak ferromagnetism (WFM) in iron-based zeolitic imidazolate framework (ZIF) glasses. This magnetic transition occurs when crystalline Fe-ZIF transforms into a disordered glassy state, opening new avenues for magnetic technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Chemistry
Background:
- Metal-organic frameworks (MOFs) often exhibit magnetic properties.
- The occurrence of intrinsic weak ferromagnetism (WFM) at room temperature in MOFs is not well understood.
Purpose of the Study:
- To investigate the possibility of intrinsic weak ferromagnetism (WFM) at room temperature in metal-organic frameworks (MOFs).
- To explore the magnetic properties of iron-based zeolitic imidazolate framework (ZIF) glasses.
Main Methods:
- Melt-quenching of crystalline Fe-ZIF to create a glassy state.
- 57Fe Mössbauer spectroscopy to analyze the magnetic and spin states of iron ions.
Main Results:
- Antiferromagnetic behavior in crystalline Fe-ZIF transitions to WFM in the corresponding glass.
- The transition to a disordered glassy state enhances exchange interactions between FeII nodes.
- 57Fe Mössbauer spectroscopy indicates a shift from low-spin to high-spin state for FeII in the glass, inducing room-temperature WFM.
Conclusions:
- Room-temperature weak ferromagnetism is achievable in iron-based ZIF glasses.
- Structural disorder and modified coordination environments are key to inducing WFM.
- MOF glasses present potential for applications in magnetic and spintronic technologies.
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