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Role of the oriented attachment mechanism in the phase transformation of oxide nanocrystals

机译：定向附着机制在氧化物纳米晶体相变中的作用

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摘要

"Bottom-up" methods to obtain nanocrystals usually result in metastable phases, even in processes carried out at room temperature or under soft annealing conditions. However, stable phases, often associated with anisotropic shapes, are obtained in only a few special cases. In this paper we report on the synthesis of two well-studied oxides-titanium and zirconium oxide-in the nanometric range, by a novel route based on the decomposition of peroxide complexes of the two metals under hydrothermal soft conditions, obtaining metastable and stable phases in both cases through transformation. High-resolution transmission electron microscopy analysis reveals the existence of typical defects relating to growth by the oriented attachment mechanism in the stable crystals. The results suggest that the mechanism is associated to the phase transformation of these structures.
机译：即使在室温下或在软退火条件下进行的过程中，“自下而上”获得纳米晶体的方法通常也会导致亚稳态相。但是，只有少数特殊情况才能获得通常与各向异性形状相关的稳定相。在本文中，我们通过在水热软化条件下两种金属的过氧化物配合物分解的新途径，报告了在纳米范围内合成的两种研究得很好的氧化物-钛和氧化锆。在两种情况下都通过转化。高分辨率透射电子显微镜分析揭示了在稳定晶体中通过定向附着机制与生长有关的典型缺陷的存在。结果表明该机制与这些结构的相变有关。

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