使用纳米压痕法测量了单晶SnO$_{2}$纳米带的硬度、断裂韧性以及裂纹形核的临界应力. 结果表明, 当载荷大于临界值后微裂纹就从压痕顶端形核、扩展; 与此相应, 在载荷--位移曲线上出现位移突变平台. 根据平台载荷计算出压痕裂纹形核的临界应力;利用裂纹的长度计算出纳米带的断裂韧性,它比其它块体脆性材料的断裂韧性小一个数量级. 实验测出纳米带的硬度H=6.25 GPa和弹性模量E=86.7GPa.
The hardness, fracture toughness and the critical stress for crack initiation of single crystalline nanobelts have been measured using nanoindentation method. The result showed that a sudden depth excursion occurred in the load--depth curves which corresponds to initiation of an indentation crack. The critical stress for the crack initiation. which is one order of magnitude less than that of the other bulk brittle materials. The average values of the hardness and modulus are H=6.25 GPa and E=86.7 GPa, respectively.
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