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Synthesis and Characterization of High-Entropy Dawsonite-Type Structures.

Amy J Knorpp1, Pietro Allegri1,2, Shangxiong Huangfu1

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High-entropy hydroxides, including dawsonite structures, are explored as novel materials. This study demonstrates their synthesis and potential for advanced catalysis and ceramics.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry

Background:

  • High-entropy materials (HEMs) are gaining attention for unique properties.
  • Hydroxide structures are underexplored within HEMs.
  • Dawsonite-type structures have applications in catalysis and ceramics.

Purpose of the Study:

  • To adapt the dawsonite-type structure into a high-entropy material.
  • To investigate the synthesis and properties of high-entropy dawsonites.
  • To explore their potential as precursors for high-entropy oxides.

Main Methods:

  • Coprecipitation synthesis method.
  • Incorporation of five equimolar cations (Al, Cr, Fe, Ga, and a variable fifth cation).
  • Characterization of cation distribution and structural properties.

Main Results:

  • Dawsonite-type materials readily formed high-entropy structures with five homogeneously distributed cations.
  • A range of fifth cations with varying ionic radii were successfully incorporated.
  • High-entropy dawsonites exhibited memory effects similar to their non-high-entropy counterparts.

Conclusions:

  • The dawsonite structure can be successfully adapted into a high-entropy material.
  • This work expands the scope of high-entropy materials to include hydroxides.
  • High-entropy dawsonites serve as a versatile platform for synthesizing advanced catalytic and ceramic materials.