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首页> 外文期刊>Physical review >Size estimation of embedded Cu nanoprecipitates in Fe by using affinitively trapped positrons
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Size estimation of embedded Cu nanoprecipitates in Fe by using affinitively trapped positrons

机译：用亲和俘获的正电子估算铁中嵌入的铜纳米沉淀物的尺寸

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摘要

By utilizing a unique characteristic of the affinitively trapped positrons, here we demonstrate a powerful method to estimate the sizes of the embedded Cu nanoprecipitates (and subnanoprecipitates) (ECNPs) in Fe. The positron-electron momentum density distributions in the ECNPs with various sizes in a thermally aged Fe-Cu dilute alloy were measured by using the two-dimensional angular correlation of positron annihilation radiation technique and the momentum smearing around the Fermi cutoff was clearly observed. It is clarified that this smearing effect is proportional to the inverse of the average radii of the ECNPs and thus it can be employed to estimate the ECNPs' sizes. Moreover, the ECNPs' sizes obtained by the present method are compared with those obtained by the three-dimensional atom probe technique and good agreement is observed, justifying the size estimation using the smearing effect. It is noteworthy that the present technique can detect the smearing due to the ECNPs with their radii even below about 0.5 nm and thus gives an important trend in the smearing reflecting the average size of the ECNPs in this range.
机译：通过利用亲和俘获的正电子的独特特征，在这里我们展示了一种强大的方法来估算Fe中嵌入的Cu纳米沉淀物（和亚纳米沉淀物）（ECNPs）的大小。通过使用正电子an没辐射技术的二维角相关性，测量了热时效Fe-Cu稀合金中各种尺寸ECNP中的正电子电子动量密度分布，清楚地观察到费米截止附近的动量涂抹。需要说明的是，这种拖尾效应与ECNP的平均半径成反比，因此可以用来估计ECNP的大小。此外，将通过本方法获得的ECNP的尺寸与通过三维原子探针技术获得的ECNP的尺寸进行比较，并且观察到良好的一致性，从而证明了利用拖影效应进行尺寸估计的合理性。值得注意的是，本技术可以检测到由于其半径甚至小于约0.5nm的ECNP而引起的拖尾，因此在拖尾中给出了重要的趋势，反映了该范围内ECNP的平均大小。

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  • 来源
    《Physical review》 |2012年第10期|p.104106.1-104106.7|共7页
  • 作者

    T. Toyama; Z. Tang; K. Inoue; T. Chiba; T. Ohkubo; K. Hono; Y. Nagai; M. Hasegawa;

  • 作者单位

    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan;

    Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan,Key Laboratory of Polar Materials and Devices (Ministry of Education of China), East China Normal University, Shanghai 200241, People's Republic of China;

    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan,Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Kyoto 606-8501, Japan;

    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan;

    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan;

    Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan,Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    positron annihilation; sol-gel processing, precipitation; fermi surface: calculations and measurements; effective mass, G factor;

    机译：正电子an灭溶胶-凝胶加工;沉淀;费米表面：计算和测量;有效质量;G因子;

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