Abstract
The structural behavior of polycrystalline perovskite SrTiO3 under 400 keV Ne2+ ion irradiation at both liquid nitrogen (LN2) and room temperature (RT) has been investigated. The grazing incident X-ray diffraction technique was applied to examine the radiation-induced structural evolution. The radiation behavior of SrTiO3 depends strongly on the irradiation temperature. At LN2 temperature, the samples exhibit significant lattice swelling and amorphization, whereas at RT, the lattice swelling is much less conspicuous and no amorphization is detected even at the highest irradiation dose of 5.0 dpa. Nevertheless, Ne2+ irradiation induces peak splitting in XRD patterns at both temperatures. Furthermore, first-principle calculations have been performed with VASP, involving possible defect types, to identify which defect is responsible for the radiation effect of SrTiO3. The results reveal that the oxygen vacancy defect is the most likely to contribute to the radiation behavior of SrTiO3.
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Acknowledgments
This work was sponsored by the National Natural Science Foundation of China (11475076, 11175076 and 11135002). Ion Beam Materials Laboratory was partially supported by the Center for Integrated Nanotechnologies, a DOE nanoscience user facility jointly operated by Los Alamos and Sandia National Laboratories.
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Su, X., Liu, C.G., Yang, D.Y. et al. The structural behavior of SrTiO3 under 400 keV Ne2+ ion irradiation. Appl. Phys. A 121, 1211–1217 (2015). https://doi.org/10.1007/s00339-015-9492-6
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DOI: https://doi.org/10.1007/s00339-015-9492-6