MB26合金超塑性的研究

研究了新型高强度镁合金ＭＢ２６超塑性拉伸、压缩的变形行为。结果表明，热挤压态ＭＢ２６合金不经过任何预处理即具有很好的超塑性。超塑性拉抻时，在４００℃、ε０＝１．１７×１０＾－２ｓ＾－１的变形条件下δ＝１４５０％，σ＝８．７ＭＰａ，ｍ值为０．６；超塑性压缩时，在４００℃、ε０＝８．３×１０＾３ｓ＾－１变形条件下，压缩真应变ε高达２．１８以上，σ＝１８ＭＰａ，ｍ值在０．４以上。     

MsISIMs五嵌段镶嵌荷电膜的研制

以五嵌段聚合物ＭｓＩＳＩＭｓ为原料，ＰＰ微孔膜为基膜制备复合膜，再经化学改性而 一种新型镶嵌荷电膜，测试结果表明，该膜具有精细的微观相分离结构，由阴离子交换区域，中性区域，阳离子交换区域交替排列组成，其阴，阳离了交换区域尺寸为０．０１μｍ，十分有利于提高离子迁移效率和分离效果，该膜的膜面电阻为９．７×１０＾２Ω．ｃｍ＾２，电压渗析系数值β＝１．４×１０＾－９Ｖ／Ｐａ基膜的接触度θ＝６９°表明该膜具     

中国环流器新一号（HL—1M）装置内壁的硼化

用无毒，不燃固体材料碳硼烷与氦直流辉光放电在ＨＬ－１Ｍ内壁上原位涂复了含碳硼膜，平均厚度５０－７０ｎｍ，碳硼比约为１：６。硼化后器壁条件有了本质的改善。尽管省去了每天长达１５小时的放电清洗，但本底真空仍然从（１－２）×１０＾－４Ｐａ提高到（５－６）×１０＾－５Ｐａ。     

三级差分抽气分子束质谱装置的设计和研究

研制了具有三级涡轮分子泵差分抽气系统的分子束质谱装置,该装置在１３３００Ｐａ典型气体采样压力下,三级差分抽气区的压力分别达到５×１０＾－１,３×１０＾－３,１．２×１－＾－４Ｐａ。利用该装置,已成功地实现了对活性离子物种Ｎ＾＋和Ｎ２＾＋的“原位”检测。     

动态流量法超高真空标准装置

研制成功的动态流量法超高真空标准装置是一台用来校准真空规的绝对真空计量标准,装置由校准系统,微流量计系统,抽气系统和计算机控制系统组成,校准系统采用四球结构,校准球室直径为５００ｎｍ,极限真空度为６．５×１０＾－９Ｐａ,校准范围为１０＾－２～１０＾－７Ｐａ不确定度为３％（１０＾－２～１０＾－６Ｐａ）和１０％（１０＾－７Ｐａ）。     

一氧化碳和苯乙烯交替共聚物的合成与表征

利用乙酸钯和２，２′－联吡啶组成的催化剂体系催化一氧化碳和苯乙烯交替共聚合成出聚（１－氧代－２－苯基丙撑）（ＳＴＣＯ）。采用ＩＲ、ＮＭＲ、元素分析以及广角Ｘ光散射对该聚合物以表征。该共聚物晶体为单斜晶胞，晶胞参数为ａ＝１５．７×１０－１０ｍ，ｂ＝６．１７×１０－１０ｍ，ｃ＝７．４５×１０－１０ｍ，α＝９０．０°，β＝１０４．３°，γ＝９０．０°；晶胞体积为６９７．２×１０－３０ｍ３；空间点群为Ｐ２１／ｃ。此外，对该共聚物热降解进行了初步研究。     

ISI/IMs共混型镶嵌荷电膜的研制

以嵌段共聚物ＩＳＩ和ＩＭｓ的共混物为原料，ＰＰ微孔膜为基膜制成了复合膜，再经过交联、季胺化和磺化而制成了一种新的共混型镶嵌荷电膜。进一步的研究显示，该膜具有典型的镶嵌荷电膜结构及性能特点，与ＭｓＩＳＩＭｓ五嵌段荷电膜具有相似的膜形态与膜结构；电性能也十分相近，膜面电阻分别为３５０、９７０Ω·ｃｍ＾２，电压渗系数分别为８×１０＾－９、６．１×１０＾－９Ｖ／Ｐａ。表明可以用ＩＳＩ／ＩＭｓ共混物代替五嵌     

抽速可达40米^3／秒的高能力涡轮分子泵系列

本文记述了抽速为５－２０米＾３／秒（对Ｈｅ）的高可靠性涡轮分子泵及其参数，经系列泵根据双流层原理制成，其极限压强大的约为５×１０＾－８Ｐａ；压缩比为（０．６－２．１）×１０＾４（对Ｈ２）和（０．９～３．２）×１０＾５（对Ｈｅ）溅余气体的主要成分是氢气，同时，此原采用了动密封以防来自轴承装置的油渗入被抽空腔内。油通过轴承被排出，在泵设计中对其入口法兰不同位置进行了设想（角度为４５°）此系列泵对突然性     

等离子体辅助反应式脉冲激光熔蚀制备AIN薄膜的低温生长

使用等离子体辅助反应式脉冲激光溅射沉积薄膜的方法在Ｓｉ（１１１）和Ｓｉ（１００）基片上已经成功地低温制备出ＡＩＮ多晶膜。实验表明,当脉冲能量密度ＤＥ＝１．０Ｊ·ｃｍ＾－２,脉冲频率ｆ＝５Ｈｚ,氮气气压ＰＮ２＝１．３３×１０＾４Ｐａ,基底温度ｔｓｕｂ＝２００℃,放电电压Ｖ＝６５０,基靶距离ｄｓ－Ｔ＝４ｃｍ时薄膜的生长速度等于６ｎｍ／ｍｉｎ。ＡＩＮ薄膜的折射率为２．０５,和基底的取向关系分别为：ＡＩＮ     

快离子导体Na1＋xZr2—yV0.8ySixP3—xO12系统的制备与电性能研究

Ｎａｓｉｃｏｎ型快离子导体Ｎａ１＋ｘＺｒ２－ｙＭ０．８ｙＳｉｘＰ３－ｘＯ１２系统采用高温固相合成，春合成温度在１３７３Ｋ左右完成，该的合成温度在ｘ不变的情况下，随着ｙ的增大而降低，大多烽合成物为单斜晶系；空间群为Ｃ３／ｃ。当ｙ不变，ｘ增大地基地率的变化是先增大，后减小。最佳导一的起始组成为ｘ＝１．５、ｙ＝０．１，其电导率在室温时为３．２０×１０＾－４Ｓ／ｃｍ，在６７３Ｋ时为６．８８×１０＾－２Ｓ／     

Preparation of ZrO2-CeO2 and HfO2-CeO2 nanopowders

We prepared weakly agglomerated powders of ZrO₂-CeO₂ and HfO₂-CeO₂ solid solutions 5–8 nm in particle size, consisting of monoclinic and tetragonal phases. After heat treatment at 1200°C, the crystallite size was 30 and 14 nm, respectively. We also examined the effect of precipitate freeze drying on the crystallization of hafnia-based solid solutions containing up to 20 mol % CeO₂.     

Comparison of the Electronic Structures of La2CuO4, Sr2CuO2Cl2, and Sr2CuO2F2

First-principles cluster calculations are reported of the local electronic structure of the three compounds: La₂CuO₄, Sr₂CuO₂Cl₂, and Sr₂CuO₂F₂. The copper ${\text{3d}}_{x^2 - y^2 } $ and the planar oxygen 2p _σ atomic orbitals exhibit a similar degree of covalency. The out-of-plane orbitals, however, are quite different with the ${\text{3}}d_{3z^2 - r^2 } $ atomic orbital lowered significantly in energy for chlorine and fluorine apical positions.     

Thermoelectric power of single-phase samples of Tl2CaBa2Cu2O y and Ba2CaSr2Cu2O y

Single-phase 2122 samples of thallium and bismuth superconductors were made by the precursor matrix method. The thermopower of these samples was measured in the temperature range 250 K-T _c . The thermopower was positive and decreased linearly with increasing temperature aboveT _c (onset). The exponential enhancement of thermopower seen in the undoped and doped YBCO was not observed in these samples. The linear variation of thermopower can be explained on the basis of either a two-band model or a narrow band model.     

VLE data for CO2-CF2Cl2, N2-CO2, N2-CF2Cl2 and N2-CO2-CF2Cl

Knowledge about vapour-liquid (VLE) is required as a basis of reliable calculations for separation processes. Correlations available for the prediction of T, p, x, y data are less accurate for mixtures at high pressures and mixtures containing supercritical components. The results of VLE experiments are reported and compared with data calculated with equations of state.     

Structure of Na2O·2TiO2 glass

X-ray radial distribution analysis and Raman spectroscopic measurement were carried out on Na₂O-2TiO₂ glass prepared by twin-roller quenching method. It is found that four-coordinated Ti⁴⁺ ions may be predominant over six-coordinated ones in the present glass. It is also found that the fraction of six-coordinated Ti⁴⁺ ions is larger in the present glass than in K₂O·2TiO₂ and Cs₂O·2TiO₂ glasses. Poorer glass-forming ability of the Na₂O-TiO₂ system compared with the K₂O-TiO₂ and Cs₂O-TiO₂ systems is ascribed to a larger fraction of TiO₆ octahedron for the former system.     

SiO2—TiO2—ZrO2系涂层的制备及其特性

用溶胶－凝胶法（sol-gel method）在不锈钢表面制备了SiO2-TiO2-ZrO2系无机氧化膜（STZ）。用DTA／TG、IR、XRD和SEM等手段研究了涂层制备时由凝胶向玻璃态的转变以及涂层薄膜的显微结构特点，考察了涂层对基体的保护效果。试验结果表明，在溶胶至凝胶最终转变为无机氧化物的过程中形成了无机网络，Si^4 和Zr^4 充当了网络骨架的形成离子。涂层为无定型玻璃态，其间混有石英、锐钛矿或金红石等微晶。     

Elastic and Electronic Properties of Superconducting CaPd 2 As 2 and SrPd 2 As 2 vs. Non-superconducting BaPd 2 As 2

The first-principles calculations were performed to predict the elastic and electronic properties of the superconducting ThCr₂Si₂-type phases CaPd₂As₂ and SrPd₂As₂ in comparison with the non-superconducting CeMg₂Si₂-type phase BaPd₂As₂. Besides, the same properties were compared for CeMg₂Si₂- and ThCr₂Si₂-type polymorphs of BaPd₂As₂. We found that all these phases are mechanically stable and belong to soft materials with low hardness. The near-Fermi region is formed by the valence states of the blocks [Pd₂As₂] with decisive contributions of Pd 4d states. The values of N(E _F) increase in the sequence: CaPd₂As₂ < SrPd₂As₂ < BaPd₂As₂, i.e. in the reverse sequence relative to the transition temperatures T _C. Thus, the change in T _C cannot be explained by the electronic factor, i.e. by the simple correlation T _C～N(E _F). Most likely the decrease in T _C in the sequence CaPd₂As₂ → SrPd₂As₂ and the absence of a superconducting transition in BaPd₂As₂ are related to the structural factors and the peculiarities of the electron–phonon coupling mechanism.     

Investigation of Instability of Lattice of Bi_2Sr_2CaCu_2O_x

Bi2Sr2CaCu2Ox superconductor was studied by differential scanning calorimetry (DSC) and thermogravimetry (TG) in different atmospheres. It is discovered that there is a thermal anomaly in the DSC curve, associated with a weight loss in the TG curve before the melting of the sample. Careful thermal analysis and high temperature X-ray diffraction reveal that the thermal anomaly and the weight loss show an instability of the crystalline Iattice. By annealing the sample in oxygen and argon, respectively and then by TC measurement and thermal analysis, the coincidence of transition temperature with the instability is found. The coincidence is further confirmed by Y-doped 2212 phase.     

Thermal conductivity of the system N2O4 ⇄ 2NO2 ⇄ 2NO + O2

Experimental data on the thermal conductivity of dissociating nitrogen tetroxide have been obtained by the hot-wire method in the temperature range from 290 to 870° K at pressures up to 10⁵ N/m².