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Modelling the effect of particle shape on the phase stability of ZrO_2 nanoparticles

机译:模拟颗粒形状对ZrO_2纳米颗粒相稳定性的影响

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摘要

At the nanoscale, zirconium dioxide may form in a number of different polymorphs, depending in part upon the size of the particles. Although considerable attention has been given to finding methods for controlling the phase of zirconium dioxide nanocrystals, the role of nanomorphology in affecting the size-dependent phase transition has been largely ignored. To address this issue, we have used a shape-dependent thermodynamic model to investigate the relationship between nanomorphology and phase stability. Our results provide the free energy of formation for tetragonal and monoclinic nanocrystals with a variety of shapes, and show that the transition size is strongly dependent on the prevalence of particular surface facets. From these results we suggest that variations in the thermochemical results reported in the literature may also be partially attributed to variations in nanocrystal shapes.
机译:在纳米级,二氧化锆可以形成许多不同的多晶型物,部分取决于颗粒的大小。尽管已经对寻找控制二氧化锆纳米晶体的相的方法给予了相当大的关注,但是纳米形态在影响尺寸依赖性相变中的作用已被大大忽略。为了解决这个问题,我们使用了形状相关的热力学模型来研究纳米形态与相稳定性之间的关系。我们的结果为具有各种形状的四方和单斜纳米晶体提供了形成的自由能,并表明过渡尺寸强烈取决于特定表面刻面的普遍性。根据这些结果,我们认为文献中报道的热化学结果的变化也可能部分归因于纳米晶体形状的变化。

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