Raman spectroscopy of selected carbonaceous samples

详细信息    查看全文

• 作者：Barbara Kwiecinska ; Isabel Suá ; rez-Ruiz ; Czeslawa Paluszkiewicz ; S ; ra Rodriques
• 关键词：High-rank coals ; Carbonaceous materials ; Graphite ; Raman spectroscopy ; X-ray diffraction ; Structural order ; Chemical parameters ; Reflectance
• 刊名：International Journal of Coal Geology
• 出版年：2010
• 出版时间：1 December 2010
• 年：2010
• 卷：84
• 期：3-4
• 页码：206-212
• 全文大小：1612 K

文摘

This paper presents the results of Raman spectra measured on carbonaceous materials ranging from greenschist facies to granulite–facies graphite (Anchimetamorphism and Epimetamorphism zones). Raman spectroscopy has come to be regarded as a more appropriate tool than X-ray diffraction for study of highly ordered carbon materials, including chondritic matter, soot, polycyclic aromatic hydrocarbons and evolved coal samples.

This work demonstrates the usefulness of the Raman spectroscopy analysis in determining internal crystallographic structure (disordered lattice, heterogeneity). Moreover, this methodology permits the detection of differences within the meta-anthracite rank, semi-graphite and graphite stages for the samples included in this study. In the first order Raman spectra, the bands located near to c.a. 1350 cm^− 1 (defects and disorder mode A_1g) and 1580 cm^− 1 (in plane E_2g zone—centre mode) contribute to the characterization and determination of the degree of structural evolution and graphitization of the carbonaceous samples. The data from Raman spectroscopy were compared with parameters obtained by means of structural, chemical and optical microscopic analysis carried out on the same carbonaceous samples. The results revealed some positive and significant relationships, although the use of reflectance as a parameter for following the increase in structural order in natural graphitized samples was subject to limitations.