Mechanical properties of beta-Si3N4 thin layers in basal plane under tension: A molecular dynamics study

作者：Lu, Xuefeng; Chen, Meng; Fan, Lei; Wang, Chao; Wang, Hongjie^*; Qiao, Guanjun

来源：Applied Physics Letters, 2013, 102(3): 031907.

DOI：10.1063/1.4788692

• BETA-SILICON NITRIDE
• NANOWIRES
• ALPHA-SI3N4
• POTENTIALS
• NANORODS
• STRENGTH
• NANOTUBE

The mechanical properties and failure mechanisms of the beta-Si3N4 thin layers in basal plane under uniaxial tension are investigated by using molecular dynamics simulations. It is found that the thin layers display a nonlinear stress-strain relationship first at epsilon<0.06, and then a linear response at 0.06<epsilon<0.09, and finally the stresses increase nonlinearly with the strains until fracture occurs. The fracture stresses and strains increase with increasing the side lengths of the thin layers, and the trend is same for Young's moduli accompanying little anisotropy. The deterioration in mechanical properties derives from the N-6h-Si bonds where the fracture is initiated.

• 出版日期2013-1-21
• 单位西安交通大学