The Study On Irradiation Amorphous Transformation Of Apatite Structure (Ca₁₀?PO₄?₆X₂) With Different Anions ?X=OH^-,Cl^- And F^-?

The response of the material to high radiation field is important to choose a material on nuclear applications.Apatite(M10(AO4)6X2)has been extensively studied as a potential nuclear waste ceramic material because of its excellent physical properties and the tolerance to radioactive elements.Over the past few decades,the different compositions of apatite samples has been studied in different irradiation conditions.In this paper,we will study the effect of different X ions to the antiradiation performance of apatite systematically.So,we can find the best anti-irradiated element at the X position.In this paper,the effects of F-,Cl-,OH-on the antiradiation properties of apatite structure are studied.In order to understand the effect of X position ions on the antiradiation performance of apatite structural samples,we also studied the behavior of F-and Cl-doped apatite structural samples under irradiation conditions.In our experiments,we selected the Ca10(PO4)6X2(X is F-,Cl-,OH-)to study from M10(AO4)6X2.We synthesized many ceramic pellets of the Ca10(PO4)6X2(X is F-,Cl-,OH-)and the samples also would be polished.Then these apatite samples were irradiated with 800 keV Kr2+ ions at a dose of 5×1013 ions/cm2 to 1 ×1015 ions/cm2.In order to compare the effects of light and heavy ion irradiation on the apatite structure,we also studied the apatite samples that irradiated by 400 keV Ne~+.The irradiated samples were characterized by grazing incidence X-ray diffraction(GIXRD).The incident angle is 0.1 ° to 3.0 °.And microscopic changes in irradiated samples were observed by cross-sectional transmission electron microscopy(TEM).The experimental results show that the apatite amorphous transformation is carried out in the irradiation experiment of 800 keV Kr2+ at room temperature,and the apatite samples with different X ions show different ability to resist amorphization.In this paper,several aspects of apatite structural ceramic were studied:(1)The effect of irradiation dose,the experimental results showed that the amorphous content of the samples were increased with the increasing of irradiation doses;(2)The effects of different X ions,the experiment showed that F-apatite had the more stronger ability to resist amorphization;(3)The effect of F/Cl ratio,the apatite with higher F proportion will have the higher irradiation tolerance to amorphization;(4)The effect of irradiated ions,the Kr2+ ion irradiation is easier to make apatite amorphous than Ne~+ ion...