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VIBRATION SPECTROSCOPY OF CENTRAL OLIVINE INCLUSIONS IN A DIAMOND
Abstract
The results of studying characteristics of IR and Raman spectra of a diamond plate from the Sytykan pipe with central olivine inclusions are presented. The correlation between changes in the content of nitrogen defects and the internal stress of individual diamond growth zones is provided by IR spectroscopy. The total nitrogen content as A and B1 defects has a range from 81 ppm to 1075 ppm. Area of decreased nitrogen defects concentration in the centre of the diamond plate corresponds to the local pressure around the olivine inclusion. The results of the Raman spectroscopy of this sample showed that the olivine inclusion is stressed. In this connection, the maximum shift of the most intensive bands of SiO4 stretching vibrations is ?? = 5 В± 0.09 and 4 В± 0.12 cm?1, which corresponds to the internal residual pressure in the inclusion of Pi = 1.64 В± 0.1 GPa calculated by formulas given in (Izraeli, 1999; Yasuzuka, 2009). According to Izraeli, E. S. (1999) and the obtained results of Pi the pressure of diamond crystallization Pf = 6,4 В± 0,5 GPa at the model growth temperature of 1200В°C is calculated. The area of diamond and inclusion contact zone is identified (bright yellow) by the Raman mapping, it exhibits wide bands 655 - 792 cm-1, typical for non-crystalline material such as Si2O(OH)6 dimers and Si(OH)4 monomers in an aqueous fluid (Nimis et al., 2016).
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