Spectres Raman des opales; aspect diagnostique et aide a la classification
Spectres Raman des opales; aspect diagnostique et aide a la classification
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蛋白石拉曼光谱；
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Serge Lefrant
中科院分区：
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作者：
Mikhail Ostrooumov;Emmanuel Fritsch;Bernard Lasnier;Serge Lefrant
拉曼光谱为蛋白石分类提供了有用的结构数据。由于该方法对短程有序和材料含水量敏感，因此与Jones和Segnit（1971）基于x射线衍射的经典分类方法相比，这种非破坏性方法提供了更多的信息。主拉曼带在低波数处的视最大值位置可以根据其结晶度对蛋白石进行分类。最无定形的蛋白石（我们研究中来自澳大利亚的蛋白石）最大超过400厘米（超级-1），最好的结晶蛋白石（我们研究中来自墨西哥的蛋白石）在325厘米左右（超级-1）。巴西蛋白石占据中间位置。两个初步结果需要在一个更大的样本上进行验证，包括所有类型的已知蛋白石矿床：拉曼光谱各波段的位置似乎是样品地理起源的特征（在地质省的规模上），也是地质起源类型的特征（火山与沉积）。
Raman spectroscopy provides structural data useful for opal classification. Because it is sensitive to short-range order and the material water content, this non-destructive method offers more information than the classical classification of Jones and Segnit (1971), based on X-ray diffraction. The position of the apparent maximum of the main Raman band at low wavenumbers can be used to classify opals on the basis of their degree of crystallinity. The most amorphous opals (those from Australia in our study) have a maximum beyond 400 cm (super -1) , the best crystallized ones (those from Mexico in our study) around 325 cm (super -1) . Brazilian opals occupy an intermediate position. Two preliminary results need to be verified on a much larger sampling including all types of known opal deposits: the position of the various bands of Raman spectrum seems to be characteristic of the geographical origin of the sample (at the scale of the geological province), and also of the type of geological origin (volcanic versus sedimentary).