Shedding light onto the spectra of lime: Raman and luminescence bands of CaO, Ca(OH)2 and CaCO3
Shedding light onto the spectra of lime: Raman and luminescence bands of CaO, Ca(OH)2 and CaCO3
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DOI：
10.1002/jrs.4622
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发表时间：
2015-01-01
影响因子：
2.5
通讯作者：
Dariz, Petra
中科院分区：
文献类型：
--
作者：
Schmid, Thomas;Dariz, Petra
在19世纪水泥石的显微镜研究中，我们发现游离石灰以暗球形结构的形式存在，正如文献中已经描述的那样。当试图用拉曼光谱确定它们的相组成时，我们在石灰相CaO、Ca(OH)(2)和CaCO3的文献光谱中遇到了矛盾的赋值，并观察到迄今为止被忽略或错误赋值的强烈光谱特征。在这项研究中，我们展示了纯石灰相和自然生长的方解石晶体、燃烧的石灰石（生石灰，主要是CaO）、老化的熟石灰腻子(主要是Ca（OH)(2)）和碳化石灰腻子（主要是CaCO3）的拉曼光谱。基于这些结果，我们主要阐明了这两个问题：(1)CaO是否具有拉曼光谱？(2)光谱中的哪些特征是发光带，可能（或者已经）被误解为拉曼带？我们用三种不同波长的激光进行激发，证明了石灰相发光带的分配，并给出了发光起源的假设，以及如何识别拉曼光谱中这些误导特征的实际建议。本文主要针对材料分析不同领域的拉曼光谱用户，他们可能没有意识到光谱中存在干扰带。版权所有：John Wiley & Sons， Ltd。
In microscopy studies of 19(th)-century cement stone, we found free lime in the form of darkened spherical structures, as they were described in the literature already. When trying to determine their phase composition by Raman spectroscopy, we encountered contradictive assignments in literature spectra of the lime phases CaO, Ca(OH)(2) and CaCO3 and observed strong spectral features that have been ignored or erroneously assigned so far. In this study we present Raman spectra of pure lime phases and of a naturally grown calcite crystal, burnt limestone (quick lime, mainly CaO), aged slaked lime putty (mainly Ca(OH)(2)), and carbonated lime putty (mainly CaCO3). Based on the results, we shed light mainly onto these two questions: (1) Does CaO have a Raman spectrum? (2) Which features in the spectra are luminescence bands that could be (and already have been) misinterpreted as Raman bands? We proof our assignment of luminescence bands in lime phases by using three different laser wavelengths for excitation, and give hypotheses on the origin of the luminescence as well as practical advices on how to identify these misleading features in Raman spectra. This article is mainly addressed to users of Raman spectroscopy in different fields of material analysis who might not be aware of the presence of interfering bands in their spectra. Copyright (c) 2014 John Wiley & Sons, Ltd.