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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >L10 Ordering of Ultrasmall FePt Nanoparticles Revealed by TEM In Situ Annealing
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L10 Ordering of Ultrasmall FePt Nanoparticles Revealed by TEM In Situ Annealing

机译：TEM原位退火揭示超小FePt纳米粒子的L10有序性

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摘要

The transformation of ≤4 nm equiatomic FePt nanoparticles from the disordered cubic Al to the ordered tetragonal Ll0 phase was studied by means of high-resolution transmission electron microscopy coupled with in situ heating experiments. In accordance with ex situ annealing experiments, a transition temperature of around 500 °C was determined. Diffusion is enhanced at surfaces and plays a dominant role in the ordering process. Hence, the ordering of the crystallographic structure starts at the surface of the nanoparticles and propagates toward their center, resulting in complete ordering within some minutes, for temperatures above 600 °C. Unlike the generally assumed lower limit of ordering (3.S nm), we demonstrate that ultrasmall (less than 3 nm) FePt nanoparticles can also be fully transformed to the Ll0 phase. The well-controlled and precise stoichiometry (Fe_(50 at.%)Pt_(5o at%)) and the homogeneous composition of these particles both play a major role in their successful phase transformation.
机译：借助高分辨率透射电子显微镜和原位加热实验，研究了≤4nm等原子FePt纳米粒子从无序立方铝到有序四方L10相的转变。根据异位退火实验，确定了约500℃的转变温度。扩散在表面上增强，并在有序过程中起主导作用。因此，对于高于600°C的温度，晶体结构的排序始于纳米颗粒的表面，并向纳米颗粒的中心传播，导致几分钟之内完全排序。与通常假定的有序下限（3.S nm）不同，我们证明了超小（小于3 nm）FePt纳米颗粒也可以完全转化为L10相。这些粒子的良好控制和精确的化学计量比（Fe_（50 at。％）Pt_（5o at％））和均一的成分均在其成功的相变中起主要作用。

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