Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Application of NMR on the Study of Natural and Synthetic Diamonds

NMR을 이용한 천연 및 합성 다이아몬드의 특성 분석 연구

  • Kim, Jong-Rang (Department of Geology, Kyungpook National University) ;
  • Shon, Shoo-Hack (Department of Geology, Kyungpook National University) ;
  • Kim, Jong-Gun (Department of Gemology, Daegu Polytechnic College) ;
  • Kim, Jeong-Jin (Department of Earth & Environmental Sciences, Andong National University) ;
  • Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
  • 김종랑 (경북대학교 자연과학대학 지질학과) ;
  • 손수학 (경북대학교 자연과학대학 지질학과) ;
  • 김종근 (대구산업정보대학 보석감정학과) ;
  • 김정진 (안동대학교 지구환경과학과) ;
  • 장윤득 (경북대학교 자연과학대학 지질학과)
  • Published : 2007.06.30
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Abstract

NMR experiments with various pulse repetition delay time were carried out for the $^{15}N\;and\;^{13}C$ of a natural gem diamond and synthetic diamonds. The natural gem diamond had a weak $^{13}C$ peak at 34.1ppm when 30 second pulse repetition delay time was applied. Similar but more prominent $^{13}C$ peaks were observed at 34.2 ppm with 0.5 second pulse repetition delay time and at 34.7 ppm with 50 second pulse repetition delay time for the synthetic diamonds. Any meaningful $^{15}N$ peak was not observed for either natural or synthetic diamonds due to extremely low content of the $^{15}N$. Significant relationship was observed between relative spin-lattice relaxation times we estimated and the content of impurities. however, it was not possible to distinguish natural diamond from synthetic diamonds due to very similar characteristics of their $^{13}C$ NMR signals except relative spin-lattice relaxation times.

보석질 천연 다이아몬드와 합성 다이아몬드의 $^{15}N$와 $^{13}C$에 대하여 다양한 스핀 이완 시간과 반복 시간을 적용한 NMR 실험을 수행하였다. $^{13}C$에 대해서는 보석질 천연 다이아몬드는 실험 반복 시간이 30초에서 34.1 ppm의 미약한 신호를 얻었으며 합성 다이아몬드에서는 실험 반복 간격이 0.5초에서부터 34.2 ppm의 신호를 얻었으며 실험 반복 시간이 50초에서는 더 뚜렷한 34.7 ppm의 신호를 얻을 수 있었다. 천연 및 합성 다이아몬드의 극히 낮은 함량에 기인하여 $^{15}N$는 NMR 신호가 감지되지 않았다. 천연 다이아몬드와 합성 다이아몬드의 이완 시간과 불순물의 성분 함량은 서로 밀접한 관련성이 있음을 확인하였으나 $^{13}C$의 NMR 특성의 유사성으로 신호의 강약의 차이를 제외하고는 천연 혹은 합성 여부의 구별은 가능하지 않았다.

Keywords

References

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