resistivity measurements were performed on PdH(D)x at high deuterium/hydrogen concentrations in the range 0.916 < x < 0.925 for PdDx and x = 0.936 for PdHx. The samples were prepared by electrolysis at lowtemperatures. Slight differences in the resistivity that were dependent on the rate of cooling, were used to investigate the variation in the phase boundary temperature with hydrogen concentration in the high
电阻率测量是在高氘/氢浓度下对 PdH(D)x 进行的,PdDx 浓度范围为 0.916 < x < 0.925,PdHx 为 x = 0.936。样品通过低温电解制备。取决于冷却速率的电阻率的细微差异被用来研究相界温度随高氢浓度区域中氢浓度的变化。绘制的加热曲线揭示了电阻率对冷却速率的依赖性,我们认为这源于系统的一个新阶段。相界的温度随着氢浓度 x 的增加而增加。
Lattice dynamics of high-pressure hydrides of the group VI–VIII transition metals
Abstract Monohydrides of the group VI–VIII transition metals Cr, Mn, Fe, Co, Ni, Mo, Rh and Pd are synthesised under high hydrogen pressures and elevated temperatures and studied by inelasticneutron scattering (INS) at ambient pressure and low temperatures. In the measured INS spectra, the energy of the main optical H peak exhibits a strong monotonic increase as a function of the nearest hydrogen–metal
摘要 VI-VIII 族过渡金属 Cr、Mn、Fe、Co、Ni、Mo、Rh 和 Pd 的一氢化物是在高氢压和高温下合成的,并在环境压力和低温下通过非弹性中子散射 (INS) 进行了研究。在测量的 INS 光谱中,主光学 H 峰的能量表现出强烈的单调增加,分别作为 3d 和 4d 金属氢化物中最近氢金属距离的函数。FCC NiH 和 PdH 的光谱在能量转移高于光学氢振动的基带时表现出强烈的各向异性,而 FCC PdD 的光谱在第二个光学 D 带的能量上没有显示出显着的方向依赖性。
<i>In situ</i>Neutron Diffraction as a Probe on Formation and Decomposition of Nitrides and Hydrides: A Case Study
作者:Marc Widenmeyer、Rainer Niewa、Thomas C. Hansen、Holger Kohlmann
DOI:10.1002/zaac.201200299
日期:2013.2
hydrogen and nitrogen, gas pressure and gas flow cells were developed for in situ neutron powder diffraction. The gas pressure cell is based on a sapphire single crystal tube as a sample holder and provides high quality diffraction patterns with very low background up to 16.0 MPa hydrogen (deuterium) gas pressure and temperatures up to 400 °C. The gas flow cell contains a silica tube as sample container
为了对涉及氢和氮等轻元素的固气反应进行实时研究,开发了用于原位中子粉末衍射的气压和气体流通池。气压池基于蓝宝石单晶管作为样品架,提供高质量的衍射图,背景非常低,高达 16.0 MPa 的氢气(氘)气压和高达 400 °C 的温度。气体流通池包含一个硅胶管作为样品容器,并针对作为反应气体的氨流动进行了优化。虽然它由于二氧化硅而产生更高的背景,但它允许使用高达 750 °C 的更高温度。对于两个电池,加热都是非接触式实现的,并且两个激光器对衍射图案没有任何贡献,因此可以在 D20(劳厄-朗之万研究所)上以一分钟的时间分辨率收集允许详细 Rietveld 分析的高质量衍射数据。示例展示了原位气体电池的潜力,范围从用流动的氨对钒和铁粉进行氮化,到钯和储氢材料 LaNi5 的氘化。
17-Hydroxy-steroids
申请人:——
公开号:US04898694A1
公开(公告)日:1990-02-06
Compounds of the formulae: ##STR1## are useful as anti-cancer, anti-obesity, anti-diabetic, anti-coronary agents, anti-aging agents, anti-hypolipidemic agents and anti-autoimmune agents.
evaporated and laser-ablated Pd atoms interact with H2 in excess argon to form the side-bonded Pd(H2) complex, which is characterized by 2971, 1507, and 950 cm-1 fundamental frequencies. These infrared absorptions are assigned to Pd(H2) on the basis of the HD and D2 shifts and DFT frequency calculations. Higher H2 concentrations favor the Pd(H2)2,3 complexes, which exhibit 3038, 778 cm-1 and 2909, 730, 319