Derivation of a Nonstoichiometric 1/1 Quasicrystal Approximant from a Stoichiometric 2/1 Quasicrystal Approximant and Maximization of the Magnetocaloric Effect.

ABSTRACT: The present research introduces a novel strategy for tuning magnetic properties by overcoming the compositional limitation of stoichiometric intermetallic compounds via extension of their compositional domain into the valence electron-per-atom (e/a) parameter space. Focusing on approximant crystals (ACs), a "double heterovalent elemental substitution" is employed in a stoichiometric Ga-Pt-Gd 2/1 AC whereby e/a is lowered from approximately 1.98 to 1.60. Through this approach, a new family of Ga-based Tsai-type 1/1 ACs with an exceptionally wide compositional domain within e/a space is derived. Remarkably, the magnetic ground state is altered from initially spin-glass to ferromagnetic (FM) with second-order phase transition and mean-field-like critical behavior. More im

SUBMITTER: Labib F 

PROVIDER: S-EPMC12447484 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature