Reflectance function nickel

Complex mean reflectance functions for aluminium, nickel, and copper are presented in Fig. 11.10. These represent a series of increasingly anisotropic... 

Froment and co-workers have employed reflexafs77 (reflection EXAFS) for studying passive films on iron78 and nickel.79 80 The experiment consists of measuring the ratio of the reflected and incident intensities as a function of energy. Although an EXAFS spectrum can be obtained from such a measurement, the process is somewhat involved since the reflectivity is a complex function... 

In our second example we look at the reduction of chlorinated ethenes at a nickel electrode and at the surfaces of two zero-valent metals [Fe(0), Zn(0)]. To gain insight into the rate-limiting process(es) in these cases, we consider how the relative overall reduction rates (relative to PCE) of PCE, TCE, and the three DCE isomers (see Fig. 14.15 for structures) vary as a function of two common descriptors used in QSARs, the one-electron reduction potential (EJ Fig- 14.17a) and the bond dissociation energy (DR X Fig. 14.176). In all these systems, the reduction rates were found to be significantly slower than diffusion of the compounds to the respective surfaces. Therefore, the large differences in the relative reactivities of the compounds between the systems reflect differences in the actual reaction at the metal surface. 

Fig.4 Change in the relative peak height of 111 reflection for the tetragonal zirconia in the catalysts prepared from the amorphous alloy precursors as a function of nickel content in the catalysts.

Fig. 2. Vitrinite reflectance measured on lignite B as a function of experimental run duration at 250°C, 2.0 kbar aqueous fluid pressure, with f02 defined by the hematite-magnetite and magnetite + quartz-fayalite solid buffers (data from Table 2 and Appendix A). The laboratory rate curve is visually estimated. The 1.0 kbar data of Dalla Torre et al. (1997) for two runs on material A with f02 approximated by the nickel-nickel oxide buffer are also shown (initially dry experiment indicated). The approximate quasithreshold value for %R is 0.74.

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