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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Entropy Engineering and Tunable Magnetic Order in the Spinel High-Entropy Oxide.

Graham H J Johnstone1,2, Mario U González-Rivas1,2, Keith M Taddei3

  • 1Department of Physics & Astronomy, University of British Columbia, VancouverBC V6T 1Z1, Canada.

Journal of the American Chemical Society
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

High-entropy oxides with spinel structures exhibit tunable ferrimagnetic order, influenced by gallium substitution. This substitution impacts cation distribution and entropy, offering a platform for advanced material design.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Magnetism

Background:

  • Spinel oxides are crucial for understanding high-entropy oxides (HEOs).
  • Configurational entropy, site selectivity, and magnetism interplay in HEOs.
  • Investigating magnetic properties in complex oxide systems is essential.

Purpose of the Study:

  • To characterize the magnetic properties of spinel (Cr, Mn, Fe, Co, Ni)3O4.
  • To study the effect of nonmagnetic gallium substitution on magnetism.
  • To correlate magnetic tunability with cation site selectivity and entropy.

Main Methods:

  • Magnetic susceptibility measurements.
  • Powder neutron diffraction.
  • X-ray absorption and magnetic circular dichroism spectroscopy.

Main Results:

  • Ferrimagnetic order in the spinel HEO is robust up to 40% Ga substitution.
  • Gallium substitution significantly tunes ordering temperature, moments, and magnetic hardness.
  • Strong site selectivity observed, with Mn, Co, and Fe occupancies redistributed; Mn accommodates valence reduction.

Conclusions:

  • Gallium substitution offers precise control over magnetic properties in spinel HEOs.
  • Site selectivity influences configurational entropy, with potential for increased stabilization.
  • Spinel oxides provide a tunable platform for entropy engineering from low to high-entropy regimes.