We investigate the mechanical properties of proposed graphene-like hexagonal gallium nitride monolayer (g-GaN) using first-principles calculations based on density-functional theory. Compared to the graphene-like hexagonal boron nitride monolayer (g-BN), g-GaN is softer, with 40 % in-plane stiffness, 50 %, 46 %, and 42 % ultimate strengths in armchair, zigzag, and biaxial strains, respectively. However, g-GaN has a larger Poisson’s ratio, 0.43, about 1.9 times that of g-BN. It was found that the g-GaN also sustains much smaller strains before rupture. We obtained the second-, third-, fourth-, and fifth-order elastic constants for a rigorous continuum description of the elastic response of g-GaN. The second-order elastic constants, including in-plane stiffness, are predicted to monotonically increase with pressure while the Poisson’s ratio monotonically decreases with increasing pressure. The sound velocity of a compressional wave has a minima of 10 km/s at an in-plane pressure of 1 N/m, while as a shear wave’s velocity monotonically increases with pressure. The tunable sound velocities have promising applications in nano waveguides and surface acoustic wave sensors.
Elastic Constant Ultimate Strain Biaxial Strain Zigzag Direction Armchair Direction
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The authors would like to acknowledge the generous financial support from the Defense Threat Reduction Agency (DTRA) Grant # BRBAA08-C-2-0130 and # HDTRA1-13-1-0025, the US Nuclear Regulatory Commission Faculty Development Program under contract # NRC-38-08-950, and US Department of Energy (DOE) Nuclear Energy University Program (NEUP) Grant # DE-NE0000325.
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