Search for new physical properties in fullerides and nanotubes by intercalation of various substances and by their microstructure control under high pressure

通过插入各种物质及其在高压下的微观结构控制来寻找富勒烯和纳米管的新物理性质

• 批准号: 11165238
• 负责人: KOBAYASHI Mototada
• 金额: $ 15.04万
• 依托单位: Himeji Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11165238/
• 关键词: fullerene; nanotube; doping; superconductivity; high pressure; 積層膜

We have tried to intercalate various substances into fullerenes and carbon nanotubes and search new physical properties with adjusting positions of intercalants by heat treatment, pressurization, co-intercalation and film evaporation. The x-ray diffraction, electrical resistivity and magnetization measurements were used.(1) Potassium fullerides K_xC_<70>(x=1,2,3,4,6,9) haye been synthesized and found x=3, 4, and 9 phases to be metallic and x=1, 2 and 6 phases to be insulating. The compounds around x=3 have a superconducting transition at 0.5 K, but other phases are not superconductor down to 40 mK(2) Sodium fullerides Na_xC_<70> have face-centered cubic structures at 1≦x≦8 and has simple cubic structure at x=11. The x=8 and 11 phases are found to be metallic, but are not superconducting down to 2 K.(3) Lithium-saturated fulleride Li_<14>C_<70> has an insulating face-centered orthorhombic structure, and Li_xC_<70> with 1≦x≦14 have face-centered cubic structures. Li_<14>C_<70> could be s … More ynthesized under pressure at room temperature.(4) C_<70>S_x(x=48 and 16) and Mg_xC_<70> were successfully synthesized.(5) Superconductivity with T_c=8.8K was newly found in Li_xC_<60>. Mg_xC_<60> was newly synthesized.(6) The effect of K intercalation and hydrogen adsorption to single wall carbon nanotubes was investigated. But the results are not clear due to a fairly large amount of ferromagnetic impurity in the tubes.(7) The x-ray diffraction measurements were performed for K_xC_<70> as a function of temperature and pressure. Noticeable sructural transitions were not found. Superconductivity under pressure was searched for Cs_3C_<60>.(8) The cryostatic ultra-high vacuum evaporation system had been constructed with a scanning tunneling microscope incorporated. The electrical conductivity with increasing intercalant concentration was measured together with a morphology and a gap observation of the film. But clear results have not been obtained. The results (1), (2), and (3) have been partly published and others are now in submission or preparation. Less

我们尝试将各种物质插入富勒烯和碳纳米管中，并通过热处理、加压、共插层和薄膜蒸发等方法调整插层位置，寻找新的物理性质。采用x射线衍射、电阻率和磁化率测量。(1)合成了K_xC_<70>(x=1,2,3,4,6,9)的富勒化物钾，发现x= 3,4和9相为金属相，x=1,2和6相为绝缘相。在x=3附近的化合物在0.5 K时发生超导转变，而在40 mK以下的化合物则不具有超导体性质。(2)在1≦x≦8时，富勒化钠Na_xC_<70>具有面心立方结构，在x=11时具有简单的立方结构。x=8和11相被发现是金属的，但在2k以下不是超导的。(3)饱和锂富勒化物Li_<14>C_<70>具有绝缘的面心正交结构，Li_ xc_ <70>具有1≦x≦14的面心立方结构。Li_<14>C_<70>可在室温加压下合成。(4)成功合成了C_<70>S_x（x=48和16）和Mg_xC_<70>。(5)在Li_xC_<60>中新发现T_c=8.8K的超导现象。Mg_xC_<60>是新合成的。(6)研究了插K和氢吸附对单壁碳纳米管的影响。但由于管中有相当多的铁磁性杂质，结果并不清楚。(7) x射线衍射测量了K_xC_<70>随温度和压力的变化。没有发现明显的结构转变。研究了Cs_3C_<60>的压力下超导性。(8)结合扫描隧道显微镜，构建了超低温超高真空蒸发系统。随着插层剂浓度的增加，测定了膜的电导率，并对膜的形貌和间隙进行了观察。但目前还没有明确的结果。结果(1)、(2)和(3)已部分发表，其他结果正在提交或准备中。少

项目成果

H.Kumada et al.: "Structural and Physical Properties of Lithium Fullerides Li_xC_<70>"AIP Conference Proc.. 590. 389-392 (2001)

H.Kumada 等人：“富勒烯锂 Li_xC_<70> 的结构和物理性质”AIP Conference Proc.. 590. 389-392 (2001)

H.Kumada et al.: "Structural and Physical Properties of Lithium Fullerides Li_xC_<70>"AIP Conference Proceedings. (to be published).

H.Kumada 等人：“富勒烯锂 Li_xC_<70> 的结构和物理性质”AIP 会议记录。

T.Hara et al.: "Metallic Phases in Sodium Fullerides Na_xC_<70>"AIP Conference Proc.. 590. 325-328 (2001)

T.Hara 等人：“富勒烯钠 Na_xC_<70> 中的金属相”AIP Conference Proc.. 590. 325-328 (2001)

M.Kobayashi et al.: "X-ray Diffraction and Physical Properties of Potassium Fullerides K_xC_<70>"Mol.Cryst.Liq.Cryst.. 340. 611-616 (2000)

M.Kobayashi 等：“富勒烯钾 K_xC_<70> 的 X 射线衍射和物理性质”Mol.Cryst.Liq.Cryst.. 340. 611-616 (2000)

T.Hara et al.: "Metallic Phases in Sodium Fullerides Na_xC_<70>"AIP Conference Proceedings. (to be published).

T.Hara 等人：“富勒烯钠 Na_xC_<70> 中的金属相”AIP 会议记录。