Distinct ruby suite at Sardapur, Orissa: A spectroscopic investigation
DSpace at IIT Bombay
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Title |
Distinct ruby suite at Sardapur, Orissa: A spectroscopic investigation
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Creator |
MAJUMDAR, AS
MATHEW, G |
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Subject |
Corundum
Ruby OAS ESR EPMA Crystal field interaction Orissa TRANSITION-METAL IONS RESONANCE CORUNDUM COLOR |
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Description |
Orissa is an important area for gem variety of corundum deposits in India. Spectroscopic studies, such as ESR, OAS on samples from Sardapur, Orissa, were carried out to ascertain the colour cause of corundum. Electron spin resonance (ESR) spectroscopic study was carried out on the samples to detect the presence of paramagnetic ions i.e. Fe2+, Fe3+, Ti4+, Cr3+ and V3+ etc. The variable temperature experiment carried out to observe the effect of heating on peak valence state change in paramagnetic ions. Samples were cut and polished to obtain the optical absorption spectrum (OAS) to detect the colour causing transition ions/defect centres. The samples of gem variety were step heated up to 300A degrees C for colour enhancement studies. EPMA analysis has revealed the low chromium concentration in the rubies. The varying hues of red in the corundum are due to the presence of bivalent and trivalent iron and charge transfer process along with Cr3+ absorption in the 550 nm region.
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Publisher |
SPRINGER INDIA
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Date |
2014-10-15T17:00:14Z
2014-10-15T17:00:14Z 2012 |
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Type |
Article
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Identifier |
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 80(5)715-722
http://dx.doi.org/10.1007/s12594-012-0197-6 http://dspace.library.iitb.ac.in/jspui/handle/100/15273 |
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Language |
en
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