μ-FTIR mapping: Distribution of impurities in different types of diamond growth
μ-FTIR mapping: Distribution of impurities in different types of diamond growth
复制标题
DOI：
10.1016/j.diamond.2012.06.003
复制
发表时间：
2012-09-01
影响因子：
4.1
通讯作者：
O'Reilly, S. Y.
中科院分区：
文献类型：
--
作者：
Howell, D.;O'Neill, C. J.;O'Reilly, S. Y.
技术的发展使傅里叶变换红外线（FTIR）绘图在矿物研究中的应用更加可行。在钻石的情况下，红外光谱提供了一种分析常见杂质的简单方法;这不仅构成了它们分类的基础，而且还可以提供对其年龄和/或热历史的见解。这些杂质的空间分布，如FTIR图谱所定义的，因此可以揭示有关金刚石生长历史的重要信息。然而，这种映射技术产生了数千个光谱，需要某种形式的自动数据处理，这在以前是不可用的。我们描述我们的新的计算机程序，命名为DiaMap。它已被写入提供定量数据的最常见的报告红外活性杂质在天然钻石;氮浓度和聚集状态，强度的血小板（B '）带，和存在的氢。虽然这个例程是为应用于天然钻石而编写的，但它也可以应用于合成钻石。在这里，我们演示了应用该方法的天然钻石的大致立方体形态的Diavik矿（加拿大），包含层的八面体，长方体和纤维生长。这些数据表明，我们传统的理解氮聚集率和血小板的发展并不适用于长方体和纤维状金刚石生长类型，并奠定了基础，更深入地研究这种金刚石。(C)2012爱思唯尔有限公司版权所有。
Developments in technology are making the application of Fourier Transform infrared (FTIR) mapping to the study of minerals more feasible. In the case of diamonds, IR spectroscopy provides a simple method of analyzing common impurities; this not only forms the basis of their classification, but may also provide insights into their age and/or thermal history. The spatial distribution of these impurities, as defined by FTIR mapping, thus can reveal significant information about the growth history of the diamond. However, this mapping technique produces thousands of spectra, creating a need for some form of automated data processing, which was previously unavailable. We describe our new computer routine, named DiaMap. It has been written to provide quantitative data on the most commonly reported IR-active impurities in natural diamonds; nitrogen concentrations and aggregation states, the intensity of the platelet (B') band, and the presence of hydrogen. While this routine is written for application to natural diamonds, it can also be applied to synthetic diamonds. Here we demonstrate the application of the method to a natural diamond of roughly cube morphology from the Diavik mine (Canada) that contains layers of octahedral, cuboid and fibrous growth. The data show that our traditional understanding of nitrogen aggregation rates and platelet development does not apply to cuboid and fibrous diamond growth types, and lays the basis for a more intensive study of such diamonds. (C) 2012 Elsevier B.V. All rights reserved.