We carry out 400 keV Ne^(2+) ion irradiation damage experiments at cryogenic temperature(about 77 K)on polycrystalline Ho_(2)Ti_(2)O_(7) pyrochlore.The irradiation fluences range from 2×10^(14) to 1.3×10^(15...We carry out 400 keV Ne^(2+) ion irradiation damage experiments at cryogenic temperature(about 77 K)on polycrystalline Ho_(2)Ti_(2)O_(7) pyrochlore.The irradiation fluences range from 2×10^(14) to 1.3×10^(15) ions/cm^(2),corresponding to the peak ballistic displacement damage of 0.075–0.487 in units of displacement per atom(dpa).The value indicates the statistical average of the fractional number of lattice atoms which have experienced a lattice displacement.Irradiation−induced structural evolution is examined by using grazing incidence x-ray diffraction(GIXRD)at x-ray anglesγ=0.25°and 3°.It is found that the irradiated layer is volumetrically swelled as compared with the underlying non-irradiated substrate and the volume increase in the irradiated layer is contributed mainly to the irradiated ion fluence.展开更多
基金by the National Natural Science Foundation of China under Grant Nos 10775062 and 10975065the Fundamental Research Funds for the Central Universities(No lzujbky-2009-25).
文摘We carry out 400 keV Ne^(2+) ion irradiation damage experiments at cryogenic temperature(about 77 K)on polycrystalline Ho_(2)Ti_(2)O_(7) pyrochlore.The irradiation fluences range from 2×10^(14) to 1.3×10^(15) ions/cm^(2),corresponding to the peak ballistic displacement damage of 0.075–0.487 in units of displacement per atom(dpa).The value indicates the statistical average of the fractional number of lattice atoms which have experienced a lattice displacement.Irradiation−induced structural evolution is examined by using grazing incidence x-ray diffraction(GIXRD)at x-ray anglesγ=0.25°and 3°.It is found that the irradiated layer is volumetrically swelled as compared with the underlying non-irradiated substrate and the volume increase in the irradiated layer is contributed mainly to the irradiated ion fluence.