| 氟碳钙铈矿6R2新多型的高分辨电镜研究 |
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| 引用本文： | 孟大维,吴秀玲.氟碳钙铈矿6R2新多型的高分辨电镜研究[J].地球科学,1994,19(5):655-661,T002. |
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| 作者姓名： | 孟大维 吴秀玲 |
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| 作者单位： | 中国地质大学测试中心 武汉430074
(孟大维,吴秀玲,杨光明),中国地质大学测试中心 武汉430074(潘兆橹) |
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| 基金项目： | 国家自然科学基金(49102019) |
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| 摘 要： | 用电子衍射和高分辨电子显微镜技术研究了钙稀土氟碳酸盐系列矿物中氟碳钙铈矿及其衍生体的微结构,发现了氟碳钙铈矿的６Ｒ２新多型体,确定了其亚结构晶胞呈六方（Ｈ）对称α＇＝０．４１２ｎｍ,ｃ＇＇＝０．４７１ｎｍ,超结构晶胞呈菱面体（Ｒ）对称,ａ＝０．７１４ｎｍ,ｃ＝８．４７８ｎｍ,可能的空间群为Ｒ３＾－ｃ和Ｒ３ｃ,［１２１０］取向的高分辨结构像显示出该多型体结构单元层沿ｃ轴的有序堆垛及重复周期。［０００
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| 关 键 词： | 氟碳钙铈矿 电子显微镜 6R2 |
A Study of New Polytype 6R_2 in Parisite by High Resolution Transmission electron Microscopy |
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| Meng Dawei Wu Xiuling Yang Guangming Pan Zhaolu.A Study of New Polytype 6R_2 in Parisite by High Resolution Transmission electron Microscopy[J].Earth Science-Journal of China University of Geosciences,1994,19(5):655-661,T002. |
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| Authors: | Meng Dawei Wu Xiuling Yang Guangming Pan Zhaolu |
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| Abstract: | The microstructures of parisite and its derived polycrystal in the calcium-rare-earth fluorocarbonate minerals from Southwest China have been studied by means of high resolution transmission electron microscopy (HRTEM)(JEOL- 2000EX and Philips-CM12). The new polytype 6R2 of parisite has been discovered. The electron diffraction analysis shows that its substructure cell belongs to the hexagonal system with the parameters a' =0.412nm, c'" = 0.471nm, and the superstructure cell belongs to the trigonal system with the parameters a = 0.714nm,c=8.478nm, and possible space group is R3c and R3c . The lattice images and the high resolution electron micrographs of the new polytype 6R2 have been taken. The ordered stacking form along c axis as well as the repeat periods of structure unit layers in this new polytype have been revealed with the high resolution structure images from the direction 1210]. In addition, the electron diffraction and the high resolution structure images from the direction 0001] show that there are heterogeneous texture in the direction of perpendicular to a or b axis, such as dislocation, fault and distortion, etc. |
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| Keywords: | parisite polytype high resolution electron microscopy |
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