高能重离子辐照高压条件下地质材料的相变研究

高能重离子辐照技术与高压技术均是材料改性、新材料合成的重要手段。高能重离子在靶材中瞬时大的能量密度沉积可导致沿入射离子路径局部区域的温度急剧增加达到甚至超过靶材熔点，导致靶材非晶化或形成亚稳的高温、高压相；高压技术虽在引起材料高压相变方面十分有效，但高压相变往往不是亚稳相。. 本申请项目将高能重离子辐照技术与金刚石压腔技术结合，通过高能重离子辐照高压条件下的石墨、磷灰石等地质材料，利用透射电子显微镜、显微共焦拉曼光谱仪、X射线衍射等技术，研究新相态的产生、辐照缺陷对亚稳相截留、潜径迹形貌等随压强、入射离子电子能损、照射剂量等重要参数的变化关系。并将结果与常压条件重离子辐照及单独加压的研究结果对比分析，从微观尺度上揭示高能重离子与高压共同作用下引起的亚稳相生成和辐照损伤对亚稳相截留的作用机制。该研究结果对材料科学、地质学等学科有重要参考价值。

High-energy heavy ions irradiation and high pressure technique are important ways to get material modification and new materials. During high-energy heavy ions passing through target material, transient huge energy density deposits in a local region where the temperature reach or even exceed the melting point, inducing the formation of amorphous or metastable high temperature or high pressure phase; Although high pressure thechnique is very efficient in getting high pressure phase transition, the phase is not usually metastable.. In this project, we combine the techniques of high-energy heavy ions irradiation and diamond anvil cell together, to study the effects of graphite and apatite induced by high-energy heavy ions under high pressure. Using transmission electron microscope, Raman spectroscopy and X-ray diffraction, it is expected to get the knowledge of the formation of new phase, the stability of the phase and latent tracks morphology as functions of pressure, electronic energy loss and ion fluence. By comparing the results with other heavy ions irradiation experiments under ambient pressure and high pressure experiments, we will give the mechanism of the formation and retainment of metastable phase induced by high-energy heavy ions under high pressure. It may shed insight on several scientific fields such as materials science, geo-science.