Physics of Minerals and Inorganic Materials

Optical spectroscopic study of synthetic NaScSi2O6–CaNiSi2O6 pyroxenes at normal and high pressures

“…It contains five bands a to e, typical of Ni 2+ in octahedral coordination (e.g. Sviridov et al 1976, Marfunin 1979, Burns 1993, the three most intense bands are distinct in spectra of rough unpolished crystals in Fig. 1.…”

“…As seen from Fig. 3, where the energies of these three bands derived from unpolarized spectra of Ni 0.1 to Ni 0.8 pyroxenes are plotted versus the molar Sviridov et al 1976, Marfunin 1979, Burns 1993). This in turn depends on the mean Ni-O distance R in the coordination octahedron as (M2) in natural orthopyroxene (Taran and Langer 2003).…”

“…Sviridov et al 1976, Marfunin 1979, Burns 1993, it acquires -similar to VI Cr 3+ -the highest crystal field stabilization energy (CFSE). However, some authors also suggest that Ni 2+ enters tetrahedral structural sites (e.g.…”

Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

“…In (Feenstra et al, 2003;Bringhurst and Greefen,1986;Phillips and Griffen, 1986;Burns, 1993) Marfunin, 1979), which makes the probability of the transition very low.…”

EPR and optical absorption spectral studies on voglite mineral

“…Thus EPR spectroscopy is a natural sequel to optical spectroscopy. Thus optical absorption not only supplements but also complements the EPR results [13]. These techniques serve to find information about the molecular structure of minerals that is not obtained through X-ray diffraction (XRD) techniques using single crystal or powder.…”