Letter. Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps
Letter. Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps
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发表时间：
2005
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通讯作者：
J. Glinnemann
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作者：
L. Nasdala;W. Hofmeister;J. Harris;J. Glinnemann
摘要拉曼成像技术为研究金刚石单晶内部生长织构和其他微观结构的不均匀性提供了一种非破坏性的手段。金刚石晶体的一级晶格振动（LO=TO声子，~1332 cm-1）的带宽（FWHM）沿沿着平面的分布图的拉曼谱图可以揭示金刚石晶体内部的生长环带。所观察到的分区的影响，在某些情况下，甚至掩盖在微区附近的夹杂物，在金刚石的非均质应变模式。我们展示了从加拿大埃卡蒂钻石矿熊猫金伯利岩中含有大型单晶石墨包裹体的钻石晶体获得的拉曼图。金刚石的生长织构总是从石墨包裹体开始的。这一结果意味着石墨一定是初生相，并且被金刚石过度生长，而金刚石和石墨的同生生长是不可能的。
Abstract The Raman mapping technique provides a non-destructive means of studying internal growth textures and other micro-structural heterogeneity inside diamond single-crystals. Raman maps showing distribution patterns of the bandwidth (FWHM) of the main first-order lattice vibration of diamond (LO=TO phonon at ~1332 cm-1) along two-dimensional planes inside diamond crystals may reveal the internal growth zoning of these crystals. The observed zoning is affected, and in some cases even obscured in micro-areas adjacent to inclusions, by patterns of heterogeneous strain in the diamond. We present Raman maps obtained from diamond crystals containing large, single-crystal graphite inclusions, from the Panda kimberlite, Ekati Diamond Mine, Canada. The diamond growth texture was always found to start from the graphite inclusion. This result implies that graphite must have been the primary phase and was overgrown by diamond, whereas syngenetic growth of diamond and graphite was unlikely.