Structural and magnetic properties of Co65C35 nanocomposite films prepared by pulsed filtered vacuum arc deposition

The formation of Co2C species in activated carbon supported cobalt-based catalysts and its impact on Fischer–Tropsch reaction

“…There were two peaks centered at 283.2 and 284.6 eV in the C 1s XPS spectra fitted using Gaussian method of 15Co1K/AC catalyst Table 2 The Co particle sizes of catalysts and the ratio of the intensity of Co 2 C/ cubic Co and relative intensity of cubic Co species (figure 3a). The peak at 283.2 eV corresponded to the binding energy of C 1s in Co 2 C species, the peak at 284.6 eV attributed to that of carbon-carbon bonds [20]. It is obvious that C 1s peak of Co 2 C species at 283.2 eV could not be observed in the 15Co/AC-S samples which shown figure 3b.…”

Diamond-like carbon coatings on a CoCrMo implant alloy: A detailed XPS analysis of the chemical states at the interface

“…Different decomposition temperatures have been reported, ranging between 280°C and 420°C [27,39,41,42]. Wang et al [26] reported that the carbide phase decomposes into Co and C after annealing at 350°C, leaving only a slight amount of Co 2 C. After annealing to 400°C, a Co 2 C phase could no longer be detected by electron diffraction. These temperatures lay well within reach during the deposition process and, although generally the substrate temperature does not exceed $200°C, locally surface and near-surface temperature spikes of 600-800°C may very well be expected [43,44].…”

“…6 (full width at half maximum (FWHM) of a Gaussian fitted to all carbide components added together) is $1.25 min etch time, corresponding to 7.7 nm of Ta 2 O 5 (the calibration standard) or to 2.9 nm of pure DLC. The ion beam etch rate of 0.5 keV Ar ions for Ta 2 O 5 is approximately twice as high as for Mo 2 C [48] and $40% higher 282.9 Co-C [24] 282.5 Co-C [25] 283.1 Co 2 C [26] 283.1 Co 2 C [27,28] 283.5 Co 3 C [29] 283.6 Cr 3 C 2 [30,31] 282.8 Cr 7 C 3 [30] 282.5 Cr 7 C 3 [32] 283.0 Cr 23 C 6 [30] 283.0 than for Cr 3 C 2 [48,49]. For the cobalt carbides, no data are available, but owing to their metastability and because the etch rate of cobalt is in-between that of chromium and molybdenum, it seems reasonable to assume for the cobalt carbides a sputter rate of $60% of that for Ta 2 O 5 .…”

Sizeable magnetic circular dichroism of artificially precipitated Co clusters in amorphous carbon

“…Our result is comparable to others. 16,20 And the Co RTA for 2 min and 5 min yields similar I(D)/I(G) ratio reveal similar graphitic sp 2 sites.…”