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• W3082898254 abstract "With the formation of structural vacancies, zirconium nitrides (key materials for cutting coatings, super wear-resistance, and thermal barrier coatings) display a variety of compositions and phases featuring both cation and nitrogen enrichment. This study presents a systematic exploration of the stable crystal structures of zirconium heminitride combining the evolutionary algorithm method and ab initio density functional theory calculations at pressures of 0 GPa, 30 GPa, 60 GPa, 90 GPa, 120 GPa, 150 GPa, and 200 GPa. In addition to the previously proposed phases P 4 2 / mnm -, Pnnm -, and Cmcm -Zr 2 N, five new high-pressure Zr 2 N phases of P 4/ nmm , I 4/ mcm , P 2 1 / m , <?CDATA $Pbar{3}m1$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mi>P</mml:mi> <mml:mover accent=true> <mml:mn>3</mml:mn> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>m</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> , and C 2/ m are discovered. An enthalpy study of these candidate configurations reveals various structural phase transformations of Zr 2 N under pressure. By calculating the elastic constants and phonon dispersion, the mechanical and dynamical stabilities of all predicted structures are examined at ambient and high pressures. To understand the structure–property relationships, the mechanical properties of all Zr 2 N compounds are investigated, including the elastic moduli, Vickers hardness, and directional dependence of Young’s modulus. The Cmcm -Zr 2 N phase is found to belong to the brittle materials and has the highest Vickers hardness (12.9 GPa) among all candidate phases, while the I 4/ mcm -Zr 2 N phase is the most ductile and has the lowest Vickers hardness (2.1 GPa). Furthermore, the electronic mechanism underlying the diverse mechanical behaviors of Zr 2 N structures is discussed by analyzing the partial density of states." @default.
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• W3082898254 date "2021-01-01" @default.
• W3082898254 modified "2023-10-06" @default.
• W3082898254 title "Novel structures and mechanical properties of Zr₂N: Ab initio description under high pressures*" @default.
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• W3082898254 doi "https://doi.org/10.1088/1674-1056/abb220" @default.
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