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Related Experiment Videos

Microstructural and Magnetic Studies on Hydrothermally Prepared Hematite

Sahu1, Rath, Mishra

  • 1Regional Research Laboratory (Council of Scientific and Industrial Research), Bhubaneswar, 751 013, India

Journal of Colloid and Interface Science
|January 15, 1997
PubMed
Summary

Hydrothermal synthesis of hematite particles shows that increasing pH reduces particle size and polycrystallinity. This pH-dependent structural change significantly impacts magnetic properties like coercive force and Morin transition temperature.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Hematite (α-Fe2O3) is a key iron oxide with diverse applications.
  • Controlling particle size and crystallinity is crucial for tuning magnetic properties.
  • Hydrothermal synthesis offers a versatile route for material fabrication.

Purpose of the Study:

  • To investigate the effect of pH on hydrothermal synthesis of hematite particles.
  • To correlate particle morphology and crystallinity with magnetic behavior.
  • To understand the formation mechanism of polycrystalline hematite.

Main Methods:

  • Hydrothermal synthesis of hematite from ferric chloride solution at 180°C and pH 3-10.
  • Characterization using Transmission Electron Microscopy (TEM) for particle size and morphology.

Related Experiment Videos

  • X-ray Diffraction (XRD) for determining mean crystallite diameter (MCD) and polycrystallinity.
  • Magnetic property measurements including coercive force, remanent magnetization, Morin transition temperature (Tm), and magnetic a.c. susceptibility.

    • Main Results:

    • Particle size decreased with increasing pH.
    • Polycrystallinity decreased with increasing pH, approaching single crystallinity at pH 10.
    • High coercive force and remanent magnetization observed at pH 3, decreasing with higher pH.
    • Morin transition temperature (Tm) showed an inverse relationship with pH.
    • Magnetic a.c. susceptibility peaked at pH 7.

    Conclusions:

    • pH is a critical parameter controlling hematite particle size, crystallinity, and magnetic properties.
    • The observed magnetic trends are attributed to changes in polycrystallinity and particle morphology.
    • A formation mechanism for polycrystalline hematite particles was proposed based on pH-dependent growth.