Distribution Characteristics and Surface Microtopography of Nitrogen Platelets in Diamond Crystals from Shandong Province, China
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摘要: 为研究山东蒙阴金伯利岩型金刚石晶体中氮片晶的分布特征, 采用红外光谱仪对116粒宝石级金刚石晶体样品中的氮片晶进行分析, 并采用微分干涉显微镜观察氮片晶在金刚石表面所具有的物理化学性质及其表面微细结构。结果表明, 80.2%的金刚石样品中具有氮片晶; 在个别浅褐色、八面体金刚石样品{111}面上观察到平行于[100]晶带方向的长条状蚀像, 这些蚀像相互平行, 大小不等。显微红外光谱对具长条状蚀像的金刚石样品{111}面的测试结果表明, 该类晶体均具有较强的氮片晶的吸收峰(1 359～1 375 cm-1)。综合浅褐色、八面体金刚石样品的红外光谱及其表面微形貌特征, 推测长条状蚀像是由氮片晶的出露点受优先选择性腐蚀而致。Abstract: In order to study the distribution characteristics of nitrogen platelets in diamond crystals from Shandong Province, China, 116 pieces of gem quality diamond crystal samples are investigated by using FTIR.The surface microstructures related to the nitrogen platelets are observed by differential interference microscope.The results show that 80.2% of the diamond samples contain nitrogen platelets.The stripe-like etch figures parallel to[100] directions on {111} planes are discovered on the surfaces of several brown octahedral diamond samples.These etch figures lie parallel to each other and vary in size.The microanalysis of the {111} planes show that there are stronger IR absorption peaks at 1 359-1 375 cm-1in the diamond samples, revealing the existence of huge quantities of nitrogen platelets.Judging from their appearances and IR spectra, the formation of the stripe-like etch figures parallel to[100]directions on{111}planes may result from selective etching of the platelets.
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