Superconductivity induced by interstitial hydrogen atoms in Laves phase compound ZrAl2

Author: Ishikura, Larissa

Affiliation: University of São Paulo

Type: Poster

Display Dates: 20.07.2026 - 21.07.2026

Board: MT-110

First described by Fritz Laves in the 1930s, Laves phases are a group of intermetallic compounds with ideal composition AB2 and consist of MgCu2 (C15, in Strukturbericht designation), MgZn2 (C14) and MgNi2 (C36) structure types, due to the observed crystallographic similarity and relationship among these structures. Laves phases are a subset of the more general Frank-Kasper phases, defined as Topologically Close-Packed (TCP), in which all the interstices are tetrahedral. The hexagonal C14 Laves phase, in particular, has 17 available interstices per formula unit, and considering electrostatic forces and lattice deformation, could theoretically store up to 6 hydrogen atoms per formula unit (AB2H6), defining hydrogen storage as one of the main prospective applications for Laves phase compounds. Despite the growing interest in this topic due to technological and industrial development for green hydrogen production, the physical properties of these materials remain largely unexplored. In this regard, ZrAl2 is a Laves phase compound that crystallizes in the C14 prototype, in which a superconducting state has been successfully induced through electrochemical hydrogenation, with critical temperature Tc ≈ 7.6 K. These results are important regarding studies in superconductivity in similar hydrogen storing compounds and the effect of the interstitial hydrogen atoms.