Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지
DOI QR코드

DOI QR Code

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

천연 갈색다이아몬드의 5.6 Gpa-10분 조건에서 처리온도에 따른 색 변화 연구

  • Li, Feng (Department of Materials Science and Engineering, University of Seoul) ;
  • Song, Oh-Sung (Department of Materials Science and Engineering, University of Seoul)
  • 이봉 (서울시립대학교 신소재공학과) ;
  • 송오성 (서울시립대학교 신소재공학과)
  • Received : 2011.08.22
  • Published : 2012.01.25
⟨ Previous Next ⟩

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

Acknowledgement

Supported by : 한국연구재단

References

  1. A. T. Collins, Diamond and Related Materials 12, 1976 (2003).
  2. G. E. Harlow, The nature of diamonds, p. 214-272 Cambridge University Press, New York, (1998).
  3. A. V. Nikiin, M. I. Samoilovich, G. N. Bezrukov, and K. F. Vorozheikin, Soviet Physics Doklandy 13, 842 (1968).
  4. T. Evans, and P. Rainey, Proceeding of the Royal Society 344, 111 (1975).
  5. T. R. Anthony, W. F. Banholzer, C. L. Spiro, and B. E. Williams, Toughened chemically vapor deposited diamond, European patent 0671482 (1995).
  6. D. Fisher and R. A. Spits, Gem & Gemology, 36, 42 (2000).
  7. S. S. Vagarali, S. W. Webb, W. E. Jackson, W. F. Banholzer, T. R. Anthony, and S. R. Kaplan, High pressure/high temperature production of colorless and fancy-colored diamonds, US patent 7323156B2, (2008).
  8. F. Li, M. S. Thesis, p. 56-79 University of Seoul (2011).
  9. H. M. Choi, Ph. D. Thesis, p. 39-41 Dongshin University (2009).
  10. R. Robertson, J. J. Fox, and A. E. Martin, Royal Society of London A232, 463 (1934).
  11. J. H. Bai, J. G. Seo, S. H. Shon, Y. K. Ahn, and J. W. Park, Kor. J. Mater. Res. 20, 287 (2010).
  12. L. Massi, E. Fritsch, A. T. Collins, T. Hainschwang, and F. Notari, Diamond Related Materials 14, 1623 (2005).
  13. K. Shi, M. Chen, B. Wang, and H. Wang, Superhard Material Engineering 22, 44 (2010).