Towards Synthetic L10-FeNi: Detecting the Absence of Cubic Symmetry in Laser-Ablated Fe-Ni Nanoparticles

Towards Synthetic L10-FeNi: Detecting the Absence of Cubic Symmetry in Laser-Ablated Fe-Ni Nanoparticles
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迈向合成 L10-FeNi:检测激光烧蚀 Fe-Ni 纳米粒子中是否存在立方对称性

DOI:
10.1016/j.apsusc.2021.150664
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发表时间:
2021
影响因子:
6.7
通讯作者:
Zangari
Zangari
中科院分区:
材料科学1区
文献类型:
--
作者:
Nadarajah;Hoglund;Semisalova;Gökce;Zangari

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L10晶体结构强调了一类重要的化学有序合金,具有单轴磁晶各向异性。从陨石中提取的近等原子L10-FeNi已经证明了永磁应用的有趣的磁性。然而,这种化学有序的非立方结构的合成一直是一个长期的挑战。在这里,我们证明了立方对称的情况下,在近等原子的铁镍纳米粒子合成皮秒脉冲激光烧蚀在液体中。在这些颗粒中检测到的非立方相只能是L10-FeNi或六方密堆积(HCP)FeNi,并且立方对称性的缺乏是明确的。非立方相和相邻立方相之间的取向关系,其特征在于通过一系列的透射电子显微镜(TEM)技术,这一致表明,非立方相的形成涉及马氏体相变过程。
TheL10crystal structure underlines an important class of chemically ordered alloys that exhibits uniaxial magnetocrystalline anisotropy. The near-equiatomicL10-FeNi extracted from meteorites has demonstrated intriguing magnetic properties for permanent magnet applications. However, the synthesis of this chemically ordered non-cubic structure has been a longstanding challenge. Here, we demonstrate the absence of cubic symmetry in near-equiatomic Fe-Ni nanoparticles synthesized by picosecond-pulsed laser ablation in liquids. The non-cubic phase detected in these particles can only beL10-FeNi or hexagonal close-packed (HCP) FeNi, and the absence of cubic symmetry was unequivocal. The orientation relationship between the non-cubic phase and the adjacent cubic phase was characterized by a series of transmission electron microscopy (TEM) techniques, which consistently suggests that the formation of the non-cubic phase involves a martensitic transformation process.
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