Magnesium oxide nanocubes are compressed along the [001] direction in situ in the transmission electron microscope. Incipient plasticity in the smaller samples is characterized by the nucleation of few $1/2<110>\{110\}$ dislocations while a larger number of line defects is observed in larger nanocubes. Yield and flow stresses scattered stochastically above a minimum value varying as the inverse of the sample size. The upper bound is given by the reduced number of dislocation sources. Such size-dependent behaviour is justified by a detailed statistical analysis and is fully explained by the deformation mechanism.

中文翻译：

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从位错成核到位错倍增陶瓷纳米粒子

氧化镁纳米立方体在透射电子显微镜中沿[001]方向原位压缩。较小样品的初期可塑性的特征是少量成核$\mathrm{1个}/\mathrm{2个}<110>\{110\}$位错，而在较大的纳米立方体中观察到大量的线缺陷。屈服应力和流应力随机分散在最小值之上，并随样本大小的倒数而变化。上限由位错源数量的减少给出。这种与尺寸有关的行为通过详细的统计分析是合理的，并且通过变形机制得到了充分的解释。