Abstract
Polycrystal fluorapatite Ca10-2xLaxNax(PO4)6F2 (x = 0.2 and 2) were successfully synthesized by solid state reaction. The both samples were irradiated with 800 keV heavy Kr2+ ions at room temperature with fluences ranging from 5.0×1013 Kr2+/cm2 to 7.0×1014 Kr2+/cm2, corresponding to peak doses of 0.06–0.84 dpa. the irradiated samples were characterized by grazing incidence X-ray diffraction (GIXRD) and cross-sectional transmission electron microscopy (XTEM). A crystalline to amorphization phase transformation was observed as the irradiation fluence up to 1.0×1014 Kr2+/cm2, and the amorphization fraction became larger with the irradiation fluence increasing. However, the amorphization fraction of both samples are different at the same irradiation fluence, where the fluorapatite Ca10-2xLaxNax(PO4)6F2 with more La doping exhibited less amorphous fraction based on GIXRD measurements. Meanwhile, the nanocrystals existed in the irradiation damaged layer of Ca6La2Na2(PO4)6F2 with irradiation fluence of 7.0×1014 Kr2+/cm2, while a fully amorphous layer was observed in Ca9.6La0.2Na0.2(PO4)6F2 at the same fluence. The results suggest that more fraction of La3+ at AI site of apatite may enhance the irradiation tolerance, especially the amorphization resistance.
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