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

Published online by Cambridge University Press:  28 August 2018

George N. Kotsonis Open the ORCID record for George N. Kotsonis [Opens in a new window] ,
Christina M. Rost ,
David T. Harris Open the ORCID record for David T. Harris [Opens in a new window]  and
Jon-Paul Maria
George N. Kotsonis*
Affiliation:
Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina, 27606, USA Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Christina M. Rost
Affiliation:
Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
David T. Harris
Affiliation:
Materials Science and Engineering, University of Wisconsin – Madison, Madison, Wisconsin 53706, USA
Jon-Paul Maria
Affiliation:
Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina, 27606, USA Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
*
Address all correspondence to George N. Kotsonis at [email protected]
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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.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 3 , September 2018 , pp. 1371 - 1377
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Copyright
Copyright © Materials Research Society 2018 

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