Micro Raman characterization of nickel sulfide inclusions in toughened glass

Optical phonons in millerite (NiS) from single‐crystal polarized Raman spectroscopy

“…On the other hand, comparison of our results with those of Bishop et al 14 reveals significant disagreements. First of all, the number of Raman bands reported by Bishop et al 14 is actually larger than the theoretically expected number, and, in addition, several reported band positions are significantly different from those observed in the present work. Several reasons for such significant discrepancies could be invoked, including the phase purity of the sample or the high laser power (15 mW at the sample) used in the experiments of Bishop et al 14 In the light of the detrimental effects caused by the use of high laser power discussed in 'Experimental', this fact and the issues discussed above raise significant questions concerning the results of Bishop et al 14 …”

“…An important feature of the work reported here is the recognition that the use of high (>1 mW) laser power in the Raman experiments is detrimental to the quality of the spectra obtained, probably as a consequence of sample degradation. Partly as a result of this factor, a previously reported Raman study of millerite, 14 which led to several additional bands than those reported in the present work, is considered unreliable. We believe that the assignment of the optical phonons of millerite reported in the present paper may be considered as a reliable and definitive assignment, which may be taken as a reference for future studies.…”

Large-scale synthesis of nickel sulfide micro/nanorods via a hydrothermal process

“…With respect to the as-prepared rhombohedral NiS micro/nanorods, the Raman spectrum exhibits two peaks that originate from two different active modes. The vibrational frequency peaks located at 216 and 289 cm −1 partly agree well with previously reported results [39]. As shown in Fig.…”

Spontaneous Fracture in Thermally Strengthened Glass - A Review and Outlook

“…Excitation at 400 nm inside glass could be possible while at 350 nm the absorption in the glass is probably too high. Raman spectroscopy has been suggested by Bishop et al [110] but it is perhaps difficult to apply on a larger scale. Similar to CT scan, that has limitations of the size of the area to be investigated as well as resolution, most industrial CT scan instruments are in the range of 100 µm in resolution but there are instruments with resolutions of 10 µm available.…”

“…Raman spectroscopy [110,119] Sensitive to both larger and small particles with the possibility to be automatized.…”