摘要
煤体经热变质作用形成的石墨叫煤基石墨。本文研究了煤基石墨的一级和二级喇曼光谱。作者认为,石墨及有关的碳质物质的一级喇曼光谱是由层内振动激发的,反映了它们作为二维晶格的完整性程度。煤基石墨中存在的层内结构缺陷分为两种,一是煤中特有的,在石墨化过程中逐渐消失;另一是由研磨(剪切应力)作用带入的,可能与构造应力作用有关。石墨化过程和剪切应力作用过程是效果近于相反的两过程,而石墨的二级喇曼光谱则可揭示其作为三维晶格的完整性程度。
Graphite formed in response to thermal contact metamorphism of coal bodies is referred to ascoal-based graphite. This study is concerned with the Raman spectra of the coal-based graphitetaken from the Lutang area, Hunan Province. The spectral features of graphitic and disordered car-bon are discussed in terms of the factor group, C_(6V)~4 and the layer site symmetry, C_(3v). All the bandsobserved for graphite and carbon in the first-order Raman spectrum are of in-plane vibrationand they are sensitive to the extent of two-dimensional graphitic ordering. There are two kinds ofin-plane structural defects in the coal-based graphite, the first kind being characteristic of thecoal and disappearing during graphitization; the second being introduced by grinding(shearing),which may be attributed to tectonic stress. The second-order Raman spectra are sensitive tothe three-dimensional graphitic ordering.
出处
《矿物学报》
CAS
CSCD
北大核心
1993年第4期313-318,共6页
Acta Mineralogica Sinica
基金
国家自然科学基金
关键词
煤基石墨
结构缺陷
石墨
散射谱
coal—based graphite
Raman spectroscopy
structural defect
graphitization
grinding(shearing)
