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

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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.

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Acknowledgments

The authors acknowledge support from NSF Ceramics, award 1610844.

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Authors and Affiliations

  1. Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina, 27606, USA

    George N. Kotsonis & Jon-Paul Maria

  2. Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia, 22904, USA

    Christina M. Rost

  3. Materials Science and Engineering, University of Wisconsin - Madison, Madison, Wisconsin, 53706, USA

    David T. Harris

  4. Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA

    George N. Kotsonis

Authors
  1. George N. Kotsonis
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  2. Christina M. Rost
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  4. Jon-Paul Maria
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Correspondence to George N. Kotsonis.

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The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2018.184.

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Kotsonis, G.N., Rost, C.M., Harris, D.T. et al. Epitaxial entropy-stabilized oxides: growth of chemically diverse phases via kinetic bombardment. MRS Communications 8, 1371–1377 (2018). https://doi.org/10.1557/mrc.2018.184

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