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http://dx.doi.org/10.3365/KJMM.2012.50.1.023

The Color Enhancement of Brown Tinted Diamonds with Annealing Temperatures in 5.6 Gpa-10 min HPHT  

Li, Feng (Department of Materials Science and Engineering, University of Seoul)
Song, Oh-Sung (Department of Materials Science and Engineering, University of Seoul)
Publication Information
Korean Journal of Metals and Materials / v.50, no.1, 2012 , pp. 23-27 More about this Journal
Abstract
The color of a natural diamond that contains nitrogen impurities can be enhanced by a high pressure high temperature (HPHT) treatment. Type IaAB diamond samples containing nitrogen impurities were executed by HPHT process of 5.6 Gpa, 10 min by varying the annealing temperature at 1600, 1650, and $1700^{\circ}C$. Property characterization was carried out using an optical microscope, FT-IR spectrometer, low-temperature PL spectrometer, and micro Raman spectrometer. By observing optical micrographs, it can be seen that diamond sample began to alter its color to vivid yellow at $1700^{\circ}C$. In the FT-IR spectrum, there were no Type changes of the diamond samples. However, amber centers leading to brown colors lessened after $1700^{\circ}C$ annealing. In the PL spectrum, all the H4 centers became extinct, while there were no changes of yellow color center H3 before or after treatment. In the Raman spectrum, no graphite spots were detected. Consequently, diamond color enhancement can be done by higher than $1700^{\circ}C$ HPHT annealing at 5.6 GPa-10 min.
Keywords
diamond; HPHT; optical properties; raman spectroscopy; PL;
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Times Cited By KSCI : 1  (Citation Analysis)
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