Modification of Lithium Tantalate Implanted by 250 keV He-ions
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PANG Li-long,
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WANG Zhi-guang,
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YAO Cun-feng,
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CUI Ming-huan,
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SUN Jian-rong,
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SHEN Tie-long,
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WEI Kong-fang,
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ZHU Ya-bin,
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SHENG Yan-bin,
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LI Yuan-fei,
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LI Jin-yu
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Graphical Abstract
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Abstract
The effects of 250 keV He + implantation in the fluence from 5.0x1014 to 5.0x1016 He+/cm2 on lithium tantalate at room temperature were investigated by 3D surface profiler, XRD and UV-Vis optical absorption spectroscopies.The experimental results show that a large number of raised stripes appear on the surface of the sample and the significant lattice swelling occurs along the direction 001 at the fluence of 5.0x1016 He+/cm2. The dependence of changes absorption edge on the fluences was revealed. After the samples had been exposed to the air for 60 days, the raised stripes on the surface have evolved into narrow cracks. Furthermore, the lattice strain and the optical absorption edge has also recovered dramatically. The relationship between surface morphology, lattice strain, optical absorption edge and behavior
of He-ions was discussed.
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