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Structural Behavior and Spin-State Features of BaAl2O4 Scaled through Tuned Co3+ Doping.

Martina Vrankić1, Ankica Šarić1, Sanja Bosnar2

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Cobalt(III)-doped Barium Aluminate (BaAl2O4) powders were synthesized and characterized. The study reveals cobalt

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Magnetism

Background:

  • Barium aluminate (BaAl2O4) is a host lattice with potential applications in various fields.
  • Doping with transition metals can significantly alter the magnetic and structural properties of host materials.
  • Understanding the precise location and oxidation state of dopant ions is crucial for material design.

Purpose of the Study:

  • To synthesize pure and Cobalt(III) (Co3+)-doped BaAl2O4 powders using a hydrothermal method.
  • To comprehensively characterize the structural and magnetic properties of the synthesized materials.
  • To investigate the influence of Co3+ doping on the BaAl2O4 lattice and its magneto-structural characteristics.

Main Methods:

  • Hydrothermal synthesis for powder preparation.
  • Static secondary ion mass spectrometry (SIMS) for elemental analysis.
  • X-ray absorption spectroscopy (XAS) at the Co K-edge (including XANES and EXAFS) for oxidation state and local symmetry determination.
  • Powder X-ray diffraction (PXRD) for structural analysis and crystallite size.
  • Rietveld structure refinement for detailed structural parameters.
  • Analysis of zero-field splitting (ZFS) terms to understand magnetic anisotropy.

Main Results:

  • Co3+ ions were successfully incorporated into the BaAl2O4 lattice, substituting Al3+ at tetrahedral Al3 sites.
  • XAS confirmed the presence of Co3+ in a tetrahedral coordination within the BaAl2O4 host.
  • Rietveld refinements indicated that the (Al3)O4 tetrahedra remained relatively regular upon doping.
  • Increased Co3+ substitution led to a significant increase in both axial and rhombic ZFS terms, enhancing magnetic anisotropy.
  • Anisotropic g-tensor components increased from 1.7 to 2.5 with increasing Co3+ doping.

Conclusions:

  • The study successfully correlated structural and magnetic properties of Co3+-doped BaAl2O4.
  • Co3+ doping at tetrahedral Al3 sites in BaAl2O4 influences magneto-structural characteristics.
  • The findings provide a strategy for controlling magnetic anisotropy in Co3+-doped BaAl2O4 by managing ZFS terms.