黄河矿超结构的测定

黄河矿是在我国发现的一种钡铈氟碳酸盐新矿物,其理想化学式为BaCeFl(CO₃)₂],本矿物属三方晶系,利用四圆衍射仪收集强度数据,测得α=b=5.070(±0.003)?,c=38.408(±0.005)?,空间群为R3m. z=6,本文在前人工作的基础上,对该矿物进行了较为精确的测定,最后的偏离因子R=0.041。本文还对黄河矿赝结构及超结构的关系作了探讨,与前人工作进行了对比,对类似矿物的修正方案提出看法,对个别实验数据作了讨论。 关键词：

DETERMINATION OF SUPERSTRUCTURE OF HUANGHOITE

Huanghoite, BaCe Fl(CO₃)₂], a new mineral from China, is a kind of carbonate containing Ba, Ce, F. It belongs to trigonal system. The intensity data are collected with the aid of fully automatic four-circle X-ray diffractometer. The lattice parameters are α=b=5.070(±0.003?), c=38.408(±0.005?); space group is R3m; z=6. More exact determination has been made on the basis of earlier worke, giving the final R=0.041.The relation between superstructure and pseudo-structure of this crystal has been analysed. We compared our results with that of earlier works. Suggestion is made for the correction for similar minerals. Finally, the individual experimental data are discussed.
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