Synthesis of high-entropy hydride from the cantor alloy (fcc–CoCrFeNiMn) at extreme conditions

TL;DR

This study shows that a Cantor alloy forms a hydride under extreme conditions, revealing new insights into high-entropy materials and their hydrogen interactions.

Contribution

The formation of a stoichiometric hydride from a Cantor alloy under high-pressure and high-temperature conditions is newly demonstrated.

Findings

The Cantor alloy forms an fcc hydride under high-pressure and high-temperature conditions.

Hydrogen content in the hydride was estimated through experimental and computational methods.

X-ray and neutron diffraction confirmed the hydride's structure.

Abstract

Studies of high-entropy materials contribute to various fields of science and reveal ever more exciting properties of applied interest. Here, we perform a study of the resistance of a Cantor alloy (CoCrFeNiMn) to hydrogen through high-pressure experiments at elevated temperatures by X-ray and neutron time-of-flight experiments and ab initio calculations. We report formation of an fcc hydride based on the Cantor alloy composition. We also provide its characterization, including an estimate of hydrogen content. These findings contribute to the growing body of knowledge on the complex chemistry of high-entropy alloys and high-entropy hydrides.

This study shows that the Cantor alloy (CoCrFeNiMn), inert to hydrogen at room temperature, forms a stoichiometric hydride under high-pressure, high-temperature conditions, supported by X-ray, neutron diffraction, and ab initio calculations.

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