Hydrodehalogenation of chlorosilanes in the presence of metal silicides: experimental studies of gas and solid phase composition related to thermodynamic calculations
摘要:
热力学计算表明,与实验研究结果一致,过渡金属在 600-1200 K 的 H2-SiCl4 气氛中会发生反应,生成金属硅化物。随着温度的升高,化学计量学将向硅含量更高的硅化物方向变化。原位形成的硅化物既是催化剂,也是 SiCl4 加氢反应生成硅烷的硅源。根据硅化物的形成焓,可以将硅化物的形成系统化。
Reactivity of Intermetallic Compounds: A Solid State Approach to Direct Reactions of Silicon
作者:Jörg Acker、Klaus Bohmhammel
DOI:10.1021/jp0130315
日期:2002.5.1
work is focused on a new approach to describe, quantify, and compare the reactivity of various transition metal silicide phases toward hydrogen chloride. Thermodynamic and kinetic parameters are obtained from isothermal calorimetric studies of these reactions. The reactivity of the silicide phases is discussed in terms of reaction start temperatures, rate constants, and apparent activation energies. Negative
Phase relationships in the La–Ni–Si system at 673 K
作者:Huaiying Zhou、Qingrong Yao、Songliu Yuan、Jingqi Liu、Heixia Deng
DOI:10.1016/s0925-8388(03)00698-4
日期:2004.3
The phase relationships in the La–Ni–Si ternarysystem at 673 K were investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). All phase relationships were studied at 673 K. At this temperature, the existence of 14 ternarycompounds has been confirmed. This section consists of 35 single-phase regions, 78
摘要 通过 X 射线衍射 (XRD)、差热分析 (DTA)、扫描电子显微镜 (SEM) 和电子探针微量分析 (EPMA) 研究了 673 K 下 La-Ni-Si 三元体系中的相关系。所有的相关系都是在 673 K 下研究的。在这个温度下,已经确认了 14 种三元化合物的存在。该部分由35个单相区、78个二相区和47个三相区组成。在 673 K 时,Si 在 Ni、La 2 Ni 7 、LaNi 5 和 La 2 NiSi 中的最大固溶度分别约为 9、3、8.33 和 5 at.%。几种三元化合物形成一个均质区,可以表示为 LaNi 11.6–9.5 Si 1.4–3.5 、LaNi 8.8–8.4 Si 4.2–4.6 和 LaNi 7.8–6.5 Si 5.2–6.5 。
Inverse photoemission study of nickel silicides
作者:M. Azizan、R. Baptist、G. Chauvet、T.A. Nguyen Tan
DOI:10.1016/0038-1098(86)90658-7
日期:1986.1
Abstract Nickelsilicides have been prepared in situ and measured by inversephotoemission in the VUV range. With concomitant ultra-violet photoemission spectroscopy, these experiments allow first to locate the positions of the occupied and non occupied bonding, non bonding and antibonding electronic states, which originate from the nickel d and silicon sp electrons when silicide compounds are formed
摘要 硅化镍已被原位制备并通过 VUV 范围内的逆光电发射进行测量。利用伴随的紫外光发射光谱,这些实验首先允许定位占据和未占据键合、非键合和反键合电子态的位置,这些电子态起源于形成硅化物时的镍 d 和硅 sp 电子,然后进行比较它们具有理论上导出的能量分布曲线。
A Co-reduction–Silicification Route to δ-Ni<sub>2</sub>Si Nanowire
δ-Ni2Si nanowires have been synthesized via a co-reduction–silicification route, using anhydrous NiCl2 and SiCl4 as nickel source and silicon source, respectively, and metallic Na as reductant in an autoclave at 600 °C for 16 h. Transmission electron microscopy (TEM) observations show that the diameters of nanowires ranged in 10–100 nm and lengths up to several tens micrometers. The possible formation mechanism is discussed.
Amorphization of M‐Si (M=Ni, Co, Mo, Mn, and Cr) powders by ball milling using revolution‐step‐like‐decreasing mode
作者:K. Omuro、H. Miura
DOI:10.1063/1.107313
日期:1992.3.23
Amorphous alloy powders of the silicide type M‐Si (M=Ni, Co, Mo, Mn, and Cr) are produced from crystalline elemental powders by high‐energy ballmillingusingrevolution‐step‐like‐decreasing (RSD) mode. In the ballmillingusing the RSD mode, after promoting true chemical alloying in milledpowder samples under high‐vial rotation of the ballmill in the earlier stage, the medium‐ or low‐vial rotations
硅化物型 M-Si 非晶合金粉末(M=Ni、Co、Mo、Mn 和 Cr)由结晶元素粉末通过高能球磨使用旋转阶梯状递减(RSD)模式生产。在RSD模式的球磨中,在前期球磨机高速旋转小瓶的情况下,在研磨后的粉末样品中促进真正的化学合金化后,连续研磨阶段的中低小瓶旋转导致粉末的非晶化由于恢复过程(例如更稳定相的成核)而导致的产物较少。通过 X 射线衍射和/或差示扫描量热法检查 RSD 研磨粉末样品的非晶性。