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NMR과 EPR을 이용한 천연, 합성, 그리고 처리된 보석용 다이아몬드의 특성 연구
김종랑 ( Jong Rang Kim ),장윤득 ( Yun Deuk Jang ),김선하 ( Sun Ha Kim ),김종화 ( Jong Hwa Kim ),백윤기 ( Youn Kee Paik ) 한국광물학회 2008 광물과 암석 (J.Miner.Soc.Korea) Vol.21 No.4
Natural, synthetic, and treated diamonds were studied by NMR and EPR. It was demonstrated that natural and synthetic diamonds, treated and non-treated diamonds, high pressure high temperature (HPHT) treated and electron beam treated diamonds could be distinguished among each other based on the 13C NMR spectra acquired for relatively short periods of 100minutes. The 13C NMR linewidths of gem quality synthetic diamonds were broader than 1.6ppm due to the paramagentic effects of transition metals, generally used as catalysts, while the linewidths of gem quality natural diamonds were narrower than 0.5ppm regardless of the methods of treatment. The linewidth (0.5ppm) for a HPHT treated, gem quality natural diamond was as broad as more than twice of the linewidth (0.2ppm) of an electron beam treated diamond. The 13C NMR signal intensities of treated, gem quality natural diamonds were as strong as more than 10 times of the intensities of non-treaed, gem quality natural diamonds. When correlated with the concentrations of the paramagnetic defects (electrons) obtained from the EPR spectra, the relative 13C NMR signal intensities increased in proportion to the concentrations of the paramagnetic electrons contained in each sample but the electron beam treated diamond was an exception. This suggested that the lattice component, in addition to the paramagnetic defect component, should also be considered in determining the 13C NMR signal intensity of the electron beam treated diamond.
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