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首页> 外文会议>Symposium on Ion Beam Synthesis and Processing of Advanced Materials held Nov 27-29, 2000, Boston, Massachusetts, U.S.A. >Lithium nanocluster formation in Li~+- ion implanted MgO
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Lithium nanocluster formation in Li~+- ion implanted MgO

机译：锂离子注入MgO中锂纳米簇的形成

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摘要

Photon absorption (PA), Positron Beam Analysis (PBA) and Neutron Depth Profiling (NDP) is applied to study the relation between photon absorption behavior and the precipitates formed by ion implantation and thermal annealing. Monocrystals of MgO(l00) were implanted with l.0Xl0~(16) ~6Li ions cm~(-2) at an energy of 30 keV. The samples were thermally annealed in air in steps up to 1200 K. After each step Doppler broadening Positron Beam Analysis (PBA) was applied to monitor the depth profile of the implantation defects. The evolution of the depth profile of lithium was followed with the aid of NDP. During the annealing there is hardly any change in the location of the lithium implantation peak at 150 nm (peak concentration 2 at. %). Only after annealing to 1200 K the majority of the lithium has left the crystal and optical absorption effects have disappeared. During annealing at 750 K an absorption band develops between 400 and 600 nm; at 950 K the maximum absorption is centered at 450 nm corresponding to Mie absorption and scattering by lithium nanoclusters. Positron beam analysis shows a considerable increase of annihilations with low momentum electrons in the implanted zone. A positron method for measuring electron momentum distributions (2D-ACAR) coupled to an intense positron beam gave evidence for the presence of semi-coherent metallic lithium inclusions.
机译：利用光子吸收（PA），正电子束分析（PBA）和中子深度轮廓分析（NDP）研究了光子吸收行为与离子注入和热退火形成的沉淀物之间的关系。以30keV的能量向MgO（100）单晶注入1.0X10〜（16）〜6Li离子cm〜（-2）。将样品在空气中以最高1200 K的温度进行热退火。每步之后，应用多普勒加宽正电子束分析（PBA）来监测植入缺陷的深度。借助NDP追踪了锂的深度分布。在退火期间，锂注入峰在150 nm（峰浓度2 at。％）的位置几乎没有变化。仅在退火到1200 K之后，大多数锂才离开晶体，光吸收效应消失了。在750 K的退火过程中，吸收带在400至600 nm之间发展。在950 K时，最大吸收集中在450 nm处，这对应于锂纳米团簇的Mie吸收和散射。正电子束分析显示，在注入区中，由于低动量电子，an灭现象显着增加。一种用于测量电子动量分布（2D-ACAR）并耦合至强正电子束的正电子方法，为存在半相干金属锂夹杂物提供了证据。

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