Abstract
The coordination environment around Ni at minor concentration levels (2 wt% NiO) in Na 2Si 2O 5 glass and melt has been investigated by high temperature (293–1250 K) X-ray absorption fine structure (XAFS) spectroscopy. The derived average anharmonic NiO distances for the glass at 293 K and the melt above 1150 K are 1.99 (1) and 1.97 (1) Å, respectively. The NiO distance in the glass is consistent with a mixture of IVNi and VNi, whereas that in the melt is consistent with dominantly IVNi. The significant reorganization of the melt during quenching may help explain the enrichment of Ni in early-formed igneous minerals. These data also suggest the possibility of a pressure-induced coordination change around Ni, which may influence significantly the geochemical modeling of the Earth.
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