A Contribution to Understanding the Infrared Spectra of Rubies from Mong Hsu, Myanmar
The infrared absorption of the rubies from Mong Hsu was analyzed in order to classify the absorption features recorded. In the mid-infrared region, it was possible to distinguish two seperate types of spectra. The first type was recorded in non-heat-treated ruby samples in the region from 1990 to 3400 cm, identifying inclusions of diaspore. The second type was recorded in heat-treated ruby samples in the region from 3100 to 3600 cm-1, indicating structurally bonded OH groups. Detailed for the first time in corundum, the building of OH groups i s accomplished as a direct result of the dehydration of diaspore inclusions, demonstrated through heat treatment experiments.
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