Record Details

Distinct ruby suite at Sardapur, Orissa: A spectroscopic investigation

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Distinct ruby suite at Sardapur, Orissa: A spectroscopic investigation
 
Creator MAJUMDAR, AS
MATHEW, G
 
Subject Corundum
Ruby
OAS
ESR
EPMA
Crystal field interaction
Orissa
TRANSITION-METAL IONS
RESONANCE
CORUNDUM
COLOR
 
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.
 
Publisher SPRINGER INDIA
 
Date 2014-10-15T17:00:14Z
2014-10-15T17:00:14Z
2012
 
Type Article
 
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
 
Language en