Details

Autor(en) / Beteiligte

• Ye, C.
• Zhang, J.
• Wu, C.Y.
• He, H.H.
• Tang, M.

Titel

Heavy Kr ion irradiation-induced amorphization on fluorapatite Ca10-2xLaxNax(PO4)6F2 (x=0.2 and 2)waste form with varying La loading

Ist Teil von

• Journal of alloys and compounds, 2020-05, Vol.822, p.153756, Article 153756

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. •Synthesis pure apatite structure nuclear waste forms with different La loading through traditional solid-state reaction.•Perform irradiation stability research with 800 keV Kr ions at room temperature.•Nanocrystals were formed in Ca6La2Na2(PO4)6F2 at 0.8 dpa, while fully amorphization was observed in Ca9.6La0.2Na0.2(PO4)6F2.•The irradiation tolerance of nuclear waste forms can be enhanced by chemical composition designing of materials.