Spectroscopic Studies on Transition Metal Ions in Colored Diamonds
MENG Yu-fei1，PENG Ming-sheng1，CHEN Wen-xuan2
1. Institute of Gemstones and Mineral Materials, Zhongshan University, Guangzhou 510275, China 2. State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan University, Guangzhou 510275，China
Abstract：Transition metals like nickel, cobalt and iron have been often used as solvent catalysts in high pressure high temperature (HPHT) synthesis of diamond, and nickel and cobalt ions have been found in diamond lattice. Available studies indicated that nickel and cobalt ions could enter the lattice as interstitial or substitutional impurities and form complexes with nitrogen. Polarized microscopy, SEM-EDS, EPR, PL and FTIR have been used in this study to investigate siｘ fancy color natural and synthetic diamonds in order to determine the spectroscopic characteristics and the existing forms of transition metal ions in colored diamond lattice. Cobalt-related optical centers were first found in natural chameleon diamonds, and some new nickel and cobalt-related optical and EPR centers have also been detected in these diamond samples.
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