he crystallization features of Fe38Hi39Si10B13 metallic glass under 100 keV and 6μA/cm2 helium ion irradiation with different doses are reported. It is found that the Fe38 Ni39Si10 B13 metallic glass crystallized und...he crystallization features of Fe38Hi39Si10B13 metallic glass under 100 keV and 6μA/cm2 helium ion irradiation with different doses are reported. It is found that the Fe38 Ni39Si10 B13 metallic glass crystallized under the helium ion irradiation at the temperature lower than the ordinary thermal crystallization temperature. The preferential precipitation phase is FeSi, and followed by the eutectic phase α-Fe. The critical dose for the formation of helium bubbles in the material is around 5x10￣16/cm2. The sensitivity of crystallization due to the temperature rising under helium ion irradiation and the mechanism of the sequence of precipitated phase are briefly discussed.展开更多
In this review,the application of light ion irradiation is discussed for tailoring novel functional materials and for improving the performance in SiC or Si based electrical power devices.The deep traps and electronic...In this review,the application of light ion irradiation is discussed for tailoring novel functional materials and for improving the performance in SiC or Si based electrical power devices.The deep traps and electronic disorder produced by light ion irradiation can modify the electrical,magnetic,and optical properties of films(e.g.,dilute ferromagnetic semiconductors and topological materials).Additionally,benefiting from the high reproducibility,precise manipulation of functional depth and density of defects,as well as the flexible patternability,the helium or proton ion irradiation has been successfully employed in improving the dynamic performance of SiC and Si based PiN diode power devices by reducing their majority carrier lifetime,although the static performance is sacrificed due to deep level traps.Such a trade-off has been regarded as the key point to compromise the static and dynamic performances of power devices.As a result,herein the light ion irradiation is highlighted in both exploring new physics and optimizing the performance in functional materials and electrical devices.展开更多
Several nanostructures we produced by ion irradiation have been reviewed in this paper. By using ions to irradiate two ultrahigh molecular weight polyethylene targets respectively, it was found that small fullerenes C...Several nanostructures we produced by ion irradiation have been reviewed in this paper. By using ions to irradiate two ultrahigh molecular weight polyethylene targets respectively, it was found that small fullerenes C20 and C26 were grown, adding two members to the fullerene family. Meanwhile, crystalline diamonds also have been produced by Ar+ ions irradiation of graphite. In the experiment of double ions Ni+ and Ar+ irradiation, nanoscale argon bubbles formed. On the other side, when multi-wall carbon nanotubes were irradiated by C+, many MWCNTs evolved to amorphous carbon nanowires and amorphous carbon nanotubes. And there are possible welding in the crossed nanotubes.展开更多
Hydroxyapatite(HA)synthesized by a wet chemical route was subjected to heavy ion irradiation,using4 Me V Krypton ion(Kr17+)with ion fluence ranging from 1×1013 to 1×1015 ions/cm2.Glancing incidence X-ray dif...Hydroxyapatite(HA)synthesized by a wet chemical route was subjected to heavy ion irradiation,using4 Me V Krypton ion(Kr17+)with ion fluence ranging from 1×1013 to 1×1015 ions/cm2.Glancing incidence X-ray diffraction(GIXRD)results confirmed the phase purity of irradiated HA with a moderate contraction in lattice parameters,and further indicated the irradiation-induced structural disorder,evidenced by broadening of the diffraction peaks.High-resolution transmission electron microscopy(HRTEM)observations indicated that the applied Kr irradiation induced significant damage in the hydroxyapatite lattice.Specifically,cavities were observed with their diameter and density varying with the irradiation fluences,while a radiation-induced crystalline-to-amorphous transition with increasing ion dose was identified.Raman and X-ray photoelectron spectroscopy(XPS)analysis further indicated the presence of irradiationinduced defects.Ion release from pristine and irradiated materials following immersion in Tris(p H 7.4,37?)buffer showed that dissolution in vitro was enhanced by irradiation,reaching a peak at 0.1 dpa.We examined the effects of irradiation on the early stages of the mouse osteoblast-like cells(MC3 T3-E)response.A cell counting kit-8 assay(CCK-8 test)was carried out to investigate the cytotoxicity of samples,and viable cells can be observed on the irradiated materials.展开更多
研究了40 k V Ti离子辐照对Zr55Cu30Al10Ni5非晶合金晶化行为和腐蚀性能的影响。通过X射线衍射和差示扫描量热分析,结果表明离子辐照导致样品发生晶化,其物相与退火晶化物相有明显差异。与8.1×1017ions/cm2剂量相比,辐照剂量为2.7&...研究了40 k V Ti离子辐照对Zr55Cu30Al10Ni5非晶合金晶化行为和腐蚀性能的影响。通过X射线衍射和差示扫描量热分析,结果表明离子辐照导致样品发生晶化,其物相与退火晶化物相有明显差异。与8.1×1017ions/cm2剂量相比,辐照剂量为2.7×1017ions/cm2时晶化量更多。电化学极化曲线和扫描电镜结果表明,辐照后样品在Na Cl溶液中的腐蚀类型为点蚀,在Na OH溶液中为均匀腐蚀,辐照后样品在两种测试溶液中的耐腐蚀性能均比铸态样品好。展开更多
文摘he crystallization features of Fe38Hi39Si10B13 metallic glass under 100 keV and 6μA/cm2 helium ion irradiation with different doses are reported. It is found that the Fe38 Ni39Si10 B13 metallic glass crystallized under the helium ion irradiation at the temperature lower than the ordinary thermal crystallization temperature. The preferential precipitation phase is FeSi, and followed by the eutectic phase α-Fe. The critical dose for the formation of helium bubbles in the material is around 5x10￣16/cm2. The sensitivity of crystallization due to the temperature rising under helium ion irradiation and the mechanism of the sequence of precipitated phase are briefly discussed.
基金This work was supported by Key-Area Research and Development Program of Guangdong Province(No.2019B 010132001)This work was also partially funded by Guangdong Basic and Applied Basic Research Foundation(2020A1515110891).
文摘In this review,the application of light ion irradiation is discussed for tailoring novel functional materials and for improving the performance in SiC or Si based electrical power devices.The deep traps and electronic disorder produced by light ion irradiation can modify the electrical,magnetic,and optical properties of films(e.g.,dilute ferromagnetic semiconductors and topological materials).Additionally,benefiting from the high reproducibility,precise manipulation of functional depth and density of defects,as well as the flexible patternability,the helium or proton ion irradiation has been successfully employed in improving the dynamic performance of SiC and Si based PiN diode power devices by reducing their majority carrier lifetime,although the static performance is sacrificed due to deep level traps.Such a trade-off has been regarded as the key point to compromise the static and dynamic performances of power devices.As a result,herein the light ion irradiation is highlighted in both exploring new physics and optimizing the performance in functional materials and electrical devices.
基金Supported by the Major Project of Knowledge Innovation the Chinese Academy of Sciences(No.KJCX2-SW-N02)
文摘Several nanostructures we produced by ion irradiation have been reviewed in this paper. By using ions to irradiate two ultrahigh molecular weight polyethylene targets respectively, it was found that small fullerenes C20 and C26 were grown, adding two members to the fullerene family. Meanwhile, crystalline diamonds also have been produced by Ar+ ions irradiation of graphite. In the experiment of double ions Ni+ and Ar+ irradiation, nanoscale argon bubbles formed. On the other side, when multi-wall carbon nanotubes were irradiated by C+, many MWCNTs evolved to amorphous carbon nanowires and amorphous carbon nanotubes. And there are possible welding in the crossed nanotubes.
基金supported by the Science Challenge Project[No:TZ2018004]National Natural Science Foundation of China[Nos.51072159,51273159]+1 种基金Science and technology program of Shaanxi Province[No:2014K10-07]Technology Foundation for Selected Overseas Chinese Scholar,Department of Human Resources and Social Security of Shaanxi Province[No:2014-27].
文摘Hydroxyapatite(HA)synthesized by a wet chemical route was subjected to heavy ion irradiation,using4 Me V Krypton ion(Kr17+)with ion fluence ranging from 1×1013 to 1×1015 ions/cm2.Glancing incidence X-ray diffraction(GIXRD)results confirmed the phase purity of irradiated HA with a moderate contraction in lattice parameters,and further indicated the irradiation-induced structural disorder,evidenced by broadening of the diffraction peaks.High-resolution transmission electron microscopy(HRTEM)observations indicated that the applied Kr irradiation induced significant damage in the hydroxyapatite lattice.Specifically,cavities were observed with their diameter and density varying with the irradiation fluences,while a radiation-induced crystalline-to-amorphous transition with increasing ion dose was identified.Raman and X-ray photoelectron spectroscopy(XPS)analysis further indicated the presence of irradiationinduced defects.Ion release from pristine and irradiated materials following immersion in Tris(p H 7.4,37?)buffer showed that dissolution in vitro was enhanced by irradiation,reaching a peak at 0.1 dpa.We examined the effects of irradiation on the early stages of the mouse osteoblast-like cells(MC3 T3-E)response.A cell counting kit-8 assay(CCK-8 test)was carried out to investigate the cytotoxicity of samples,and viable cells can be observed on the irradiated materials.
文摘研究了40 k V Ti离子辐照对Zr55Cu30Al10Ni5非晶合金晶化行为和腐蚀性能的影响。通过X射线衍射和差示扫描量热分析,结果表明离子辐照导致样品发生晶化,其物相与退火晶化物相有明显差异。与8.1×1017ions/cm2剂量相比,辐照剂量为2.7×1017ions/cm2时晶化量更多。电化学极化曲线和扫描电镜结果表明,辐照后样品在Na Cl溶液中的腐蚀类型为点蚀,在Na OH溶液中为均匀腐蚀,辐照后样品在两种测试溶液中的耐腐蚀性能均比铸态样品好。
