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http://nopr.niscpr.res.in/handle/123456789/24467| Title: | Chemical and electronic spectral studies of ullmannite (Ni4Sb4S4) |
| Authors: | Reddy, S N Ravikumar, R V S S N Reddy, B J Reddy, Y P |
| Issue Date: | Oct-2000 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The streak grayish black coloured and almost opaque mineral ullmannite belonging to France received from Musee De Mineralogie, Ecole Natle, Supre Des Mines, Paris, France, has been investigated by atomic absorption spectroscopy (AAS) and optical absorption spectroscopy. The AAS analysis shows that the mineral contains the transition elements nickel (1. 14%), iron (0.29%), cobalt (0.073%), copper (0.013%), and manganese (0.003 1 %). The bands observed at 25967, 24993, 21546, 14966, 12252 and 861 8 cm-1 in the optical absorption spectrum recorded at room temperature are assigned to different transitions of Ni(lI) ion. The following crystal field parameters are evaluated: Dq = 860 cm-1, B = 840 cm-1, and C= 3350 cm-1, respectively. These values confirm the octahedral symmetry for Ni(II) in the mineral ullmannite. |
| Page(s): | 459-460 |
| Appears in Collections: | IJEMS Vol.07(5-6) [October-December 2000] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJEMS 7(5-6) 459-460.pdf | 428.1 kB | Adobe PDF | View/Open |
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