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Shape transformation of Sn nanocrystals induced by swift heavy-ion irradiation and the necessity of a molten ion track

机译:快速重离子辐照引起的Sn纳米晶的形变及熔融离子轨道的必要性

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摘要

We report on the spherical to rodlike shape transformation of Sn nanocrystals (NCs) embedded in amorphous SiO_2 following irradiation with 185 MeV Au ions. Consistent with previous reports for other metals, transmission electron microscopy demonstrates that under irradiation, Sn NCs larger than a critical size (11 nm) elongate parallel to the incident ion direction, while smaller particles remain spherical. Irradiation-induced NC dissolution is significant, as evident from the formation of smaller NCs in place of their original larger counterparts. Using formation conditions that yield Sn NCs at the amorphous-SiO_2/crystalline-Si interface, we show that the irradiation-induced shape change occurs only within the SiO_2 layer, in the direction opposite to that of the incident ions. We suggest this demonstrates the necessity of a molten ion track and provides further evidence for an elongation process involving NC melting and flow.
机译:我们报道了185 MeV Au离子辐照后,嵌入到非晶SiO_2中的Sn纳米晶体(NC)的球形到棒状形状转换。与先前有关其他金属的报道一致,透射电子显微镜表明,在辐照下,大于临界尺寸(11 nm)的Sn NCs平行于入射离子方向伸长,而较小的颗粒保持球形。辐照引起的NC溶解非常重要,这从较小的NC代替原来的较大NC可以明显看出。使用在非晶态SiO_2 /晶体-Si界面上产生Sn NCs的形成条件,我们表明辐照引起的形状变化仅发生在SiO_2层内,与入射离子的方向相反。我们建议这证明了熔融离子径迹的必要性,并为涉及NC熔融和流动的延伸过程提供了进一步的证据。

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  • 来源
    《Physical review》 |2010年第11期|p.113410.1-113410.4|共4页
  • 作者单位

    Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

    rnInstituto de Fisica, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, Ciaxa Postal 1501, CEP 91501-970, Porto Alegre, Rs, Brazil;

    rnResearch School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

    rnResearch School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

    rnResearch School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

    rnInstituto de Fisica, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, Ciaxa Postal 1501, CEP 91501-970, Porto Alegre, Rs, Brazil;

    rnResearch School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

    rnResearch School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

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  • 正文语种 eng
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  • 关键词

    physical radiation effects, radiation damage (for photochemical reactions, see 82.50.-m); transmission electron microscopy (TEM) (including STEM, HRTEM, etc.);

    机译:物理辐射效应;辐射损害(关于光化学反应;请参见82.50.-m);透射电子显微镜(TEM)(包括STEM;HRTEM等);

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