Amorphization and annealing of LiTaO3 single crystal irradiated with Ar+ ions at 77 K
Amorphization and annealing of LiTaO3 single crystal irradiated with Ar+ ions at 77 K
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DOI：
10.1063/1.1450023
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发表时间：
2002-02
影响因子：
3.2
通讯作者：
Z. Zhang;I. Rusakova;W. Chu
中科院分区：
文献类型：
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作者：
Z. Zhang;I. Rusakova;W. Chu
利用卢瑟福背散射沟道、截面透射电镜、光学透射率和表面轮廓仪研究了钽酸锂单晶在Ar+离子辐照下的辐照损伤缺陷结构和再生长过程。在77 K下用217 keV Ar+离子以3×1013和6×1015 Ar+/cm 2之间的各种剂量进行辐照。在648至823 K的温度下，在干燥的O2环境中进行退火后处理，该温度低于居里温度（878 K）。光学测量表明，辐照样品与未辐照样品一样透明，表明辐照引起的点缺陷即使在77 K下也是高度移动的。而在77 K时，氧自由基的长程迁移受到抑制。当辐照剂量超过1.25×1014 Ar+/cm ~ 2时，发生体积膨胀。在接受1.5×1014 Ar+/cm 2剂量的样品中观察到集体晶格畸变。这项研究表明，这两种疾病重叠...
The defect structure of radiation damage due to irradiation of Ar+ ions and the regrowth of LiTaO3 single crystal has been studied using Rutherford backscattering-channeling, cross-sectional transmission electron microscopy, optical transmittance, and surface profilometer. The irradiation were carried out at 77 K with 217 keV Ar+ ions to various doses between 3×1013 and 6×1015 Ar+/cm2. Postannealing was performed in dry O2 ambient at temperatures from 648 to 823 K, which are below Curie temperature (878 K). The optical measurement showed that the as-irradiated samples are as transparent as the unirradiated sample, indicating that the radiation-induced point defects are highly mobile even at 77 K. However, the long-range migration of oxygen interstitials were suppressed at 77 K. Volumetric expansion occurred when irradiation doses exceeded 1.25×1014 Ar+/cm2. Collective lattice distortion was observed in the sample that had received a dose of 1.5×1014 Ar+/cm2. This study shows that both disorder overlapping...