On the discrimination of semi-graphite and graphite by Raman spectroscopy

被引：75
作者：
Rantitsch, Gerd [1 ]
Laemmerer, Wolfgang [2 ]
Fisslthaler, Evelin [3 ]
Mitsche, Stefan [3 ]
Kaltenboeck, Heidi [1 ]
机构：
[1] Univ Leoben, Dept Appl Geosci & Geophys, A-8700 Leoben, Austria
[2] Univ Leoben, Dept Mineral Resources Engn, A-8700 Leoben, Austria
[3] Graz Univ Technol, Inst Electron Microscopy & Nanoanal, Steyrergasse 17, A-8010 Graz, Austria
来源：
INTERNATIONAL JOURNAL OF COAL GEOLOGY | 2016年 / 159卷
关键词：
Graphite; Semi-graphite; Reflectance; X-ray-diffraction; High-resolution TEM; Raman spectroscopy; NORTH CHINA CRATON; CARBONACEOUS-MATERIAL; NATURAL GRAPHITE; EVOLUTION; GRAPHITIZATION; ROCKS; MINERALIZATION; REFLECTANCE; PARAMETERS; VITRINITE;
D O I：
10.1016/j.coal.2016.04.001
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Graphite samples from several mines (Austria, Brazil, China, Madagascar, Mozambique, Norway, Russia, Sri Lanka and Ukraine) were investigated by reflectance measurements, X-ray-diffraction, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and Raman spectroscopy. X-ray diffraction indicates that the structural order of the carbonaceous matter (CM) varies in dependence on the metamorphic rank of the host rock. Semi -graphite is found in lower greenschist fades samples from the Kaisersberg mine (Austria). At the nanoscale, micropores characterize semi-graphite. They are polygonized in the transition zone between semi -graphite and graphite. During progressive graphitization within the greenschist facies, semi graphite is transformed continuously to graphite. HRTEM images and SAED data show a transformation of the microporous nano-texture to a predominantly lamellar texture. Perfect graphite is observed in samples from the granulite facies. Raman spectroscopy mirrors this evolution. The observed spectral characteristics, the width of the Raman G band and the D1 / (G + D1 + D2) area ratio of the CM Raman spectrum discriminate semi-graphite and graphite. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：48 / 56
页数：9
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