Epitaxial entropy-stabilized oxides: Growth of chemically diverse phases via kinetic bombardment

George N. Kotsonis, Christina M. Rost, David T. Harris, Jon-Paul Maria

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Abstract

This paper explores thin films of the entropy-stabilized oxide (ESO) composition MgxNixCoxCuxZnxScxO (x ∼ 0.167) grown by laser ablation in incremental gas pressures and O2/Ar ratios to modulate particle kinetic energy and plume reactivity. Low pressures supporting high kinetic energy adatoms favor the kinetic stabilization of a single rocksalt phase, while high pressures (low kinetic energy adatoms) result in phase separation. The pressure threshold for phase separation is a function of O2/Ar ratio. These findings suggest large kinetic energies facilitate the assembly and quench of metastable ESO phases that may require immoderate physical or chemical conditions to synthesize using near-equilibrium techniques.

Original languageEnglish (US)
JournalMRS Communications
DOIs
StateAccepted/In press - Jan 1 2018

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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