Journal
PHYSICAL REVIEW B
Volume 83, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.060101
Keywords
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Funding
- Los Alamos National Security LLC under DOE [DEAC52-06NA25396]
- DOE, Office of Science and Basic Energy Sciences [DE-SC0001057]
- Los Alamos Director's Postdoctoral Fellowship
- US Department of Energy, NNSA [DEFC52-06NA26274]
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We report on a comprehensive study of thermodynamic and mechanical properties as well as a bond-deformation mechanism on ultra-incompressible Re(2)N and Re(3)N. The introduction of nitrogen into the rhenium lattice leads to thermodynamic instability in Re(2)N at ambient conditions and enhanced incompressibility and strength for both rhenium nitrides. Rhenium nitrides, however, show substantially lower ideal shear strength than hard ReB(2) and superhard c-BN, suggesting that they cannot be intrinsically superhard. An intriguing soft ionic bond mediated plastic deformation mechanism is revealed to underline the physical origin of their unusual mechanical strength. These results suggest a need to reformulate the design concept of intrinsically superhard transition-metal nitrides, borides, and carbides.
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