Novel nano-crystalline Er2O3 hydrogen isotopes permeation barriers

Hydrogen Isotopes permeation barriers (HIPB) are used to reduce hydrogen isotopes permeation and leakage in the fields such as thermonuclear fusion energy, hydrogen energy, petroleum industry and vacuum solar receiver. In this study, nano-crystalline Er₂O₃ HIPB with about 5–10 nm grain size were made by sol-gel method. Their performances, including deuterium-permeation reduction factor (D-PRF), micro-structure, mechanical property and electrical property were reported. The D-PRF of 0.2 μm nano-crystalline Er₂O₃ HIPB reached 300 at 700 °C and did not deteriorate after 128 h deuterium permeation. The bonding strength and the nano-hardness steadily remained about 13 N and 10 GPa after 128 h deuterium permeation at 700 °C, respectively. The morphology and micro-structures of the nano-crystalline Er₂O₃ HIPB showed no measurable changes after 128 h deuterium permeation, which ensured the stable D-PRF and mechanical properties. However, the electrical resistivity of the nano-crystalline Er₂O₃ HIPB decreased after deuterium permeation at 700 °C. The electrical resistivity decreased from 9 × 10⁹ Ω cm by over three orders of magnitude and then tended to be stable, which might be attributed to oxygen loss or deuterium invasion.     

用空气阴极氘灯对空气——乙炔焰原子吸收光谱法测定纯铝中锌的背景校正

论证了空心阴极氘灯背景扣除能力．用火焰原子吸收法测定炖铝中锌时会遇到背景吸收问题，分别使用了空心阴极锌灯和空心阴极氘灯对含锌量为0．0032％纯铝试样进行两次测定，当测试溶液的基本浓度为0．5％（m/V）时，不扣背景测定也令偏高至0．0044％，扣除背景后规定值为0．0034％．     

氘双等离子体离子源的进展

一、引言低能加速器型中子发生器利用D-T反应能产生单色的14MeV快中子。发生器对离子束的要求既可以是原子离子(即必须分析),也可以是混合束(即不经分析)。现在中子发生器大多采用磁分析,虽然设备复杂些,但还是有其优点的。在原先调试的基础上,我们又进行了束分析的调试,源的结构也做了一些改进,使源的性能有了进一步提高。     

氘／固体系统异常中子测量

设计了一系列的实验来观察重水电解槽和吸氘钛材料温度循环中异常中子生成现象。在电解实验中采用BORON-Ⅰ中子探测系统。该系统包括16只BF_3计数管,其2 h计数的探测极限为0.38中子/s。对于所设计的7种F及P型和Jones型实验条件,并未观察到高于BORON-Ⅰ系统探测极限的中子产额。在吸氘钛碎屑的温度循环中,采用了一台HLNCC-Ⅱ型中子探测装置。这台装置配有18只~3He计数管,用移位寄存符合单元计数。对随机中子发射率,其探测极限为0.20中子/s。选择了不同材料和样品处理程序来研究骤发中子群频率和强度的变化。设计了实验程序     

DEPTH PROFILING OF DEUTERIUM IN Al2O3

ＤＥＰＴＨ　ＰＲＯＦＩＬＩＮＧ　ＯＦ　ＤＥＵＴＥＲＩＵＭ　ＩＮ　Ａｌ_２Ｏ_３￥ＴａｎＸｉａｏｈｕａ（谈效华）；ＬｕｏＳｉｗｅｉ（罗四维）；ＳｏｎｇＺｈｅｍｉｎｇ（宋哲明）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＥｌｅｃｔｒｏｎｉｃｓｏｆＣＡＥＰ，Ｃｈｅ...     

Molecular motion and transitions in solid tripalmitin measured by deuterium nuclear magnetic resonance

Deuterium nuclear magnetic resonance (NMR) quadrupole echo spectra of deuterated acyl chains and the glyceryl moiety of tripalmitin were found to depend on the crystal form. At 20°C, which is below melting points, line shapes indicate that molecular motions in theβ form (triclinic subcell) are more restricted than inβ′ (orthorhombic) orα (hexagonal). Motional rates in excess of about 20 kHz are responsible for the line shapes. Spin-lattice relaxation, sensitive to motional frequencies in the tens of megahertz range, is much faster for methyl (CD₂) groups inα orβ′ than inβ, indicating that fast motions are also governed by crystal form. General theoretical considerations suggest that motion of methylene groups is dynamically heterogeneous and that motion of methyl (CD₃) groups may be averaged by motions other than rotation about the terminal C-C bond. The isothermal solid-state transition fromα toβ, induced by increasing the temperature to 35°C, was accompanied by NMR lineshape changes consistent with immobilization. The reversible transition ofα to “sub-α” upon cooling, accompanied by orthorhombic-like Bragg spacings and other changes in the X-ray pattern and by corresponding changes in the infrared spectrum, also produced a marked restriction in NMR-detected mobility of the kind seen inβ′ relative toα. The advantages of²H NMR for studies of motions and transitions in solid glycerides are discussed. Presented at the 80th Annual Meeting of AOCS in Cincinnati, May 1989, and at the 81st Annual Meeting in Baltimore, May 1990.     

Study of deuterium metal interaction by ion implantation

Dynamic and non-equilibrium effects involving interaction between deuterium and radiation produced defects were studied during deuterium implantation of Cu and Ti. The technique of neutron yield measurement during deuterium implantation was employed and theoretical analysis was made to study the dynamics. SIMS, GIXRD and SEM studies on deuterium implanted samples were employed to study the evolution of implanted deuterium profiles, structure of deuterides and surface topography respectively.     

Neutron powder diffraction and solid-state deuterium NMR studies of Ca2RuD6 and the stability of transition metal hexahydride salts

The crystal structure of Ca₂RuD₆ has been determined by neutron powder diffraction: space group Fm3m, K₂PtCl₆ structure, as found for other hexahydride salts of group 8 metals with alkaline earth or lanthanide counter ions. No structural phase transition was observed between 340 K and 50 K. The deuterium nuclear quadrupole coupling constant, 54.7 kHz, leads to an ionic character of the Ru–D bond of 76%. The known trends in the behaviour of A₂MH₆ salts are interpreted in terms of the ionization energies of the cation and the central metal atom.     

重水对栅藻和卵形藻生长和光合的促进作用

选择二种微藻分别在３０％重水和普通水培养液中培养，测定其生长、荧光动力学和低温荧光发射光谱的变化。生长数据结果表明，卵形藻和斜生栅藻在重水中活性增加，生长得到促进，荧光动力学数据与生长数据一致低温荧光发射光谱数据表明，３０％重水抑制光系统Ｉ的活性比光系统Ⅱ更为明显。     

钯晶体中氘的表观扩散系数与晶格扩散系数

利用电化学氘渗透方法,测定了室温附近氘在钯晶体中的表观扩散系数和晶格扩散系数。在理论分析的基础上,计算出钯晶体中氘与陷阱的平均结合能和氘陷阱密度与点阵间隙位置密度之比