摘要
采用CM12透射电镜,对我国四川昌北M稀土矿床中的氟碳钙铈矿微结构特征作了电子衍射分析和晶格象观察,揭示出氟碳钙铈矿晶体中混合多型体的堆垛序列,在不同部分观测到不同的多型体,其中以氟碳钙铈矿6R多型为常见普通多型体。本次工作发现了42R、48R和16H三种新多型,并进一步证明,氟碳钙铈矿晶体中存在的多型结构相当复杂,但以长周期堆垛形成的多型体出现的几率要比短周期堆垛的多型体少得多。
The microstructural characteristics of parisite occurring in the M rare-earth deposit atChangbei, southwestern Sichuan Province have been studied by electron diffraction analysis andlattice image observation, revealing the stacking sequence of mixed polytypism existing inparisite. The structures of different polytypes existing in different parts of the crystal have been ob-served. The 6R polytype is a common one with short-period, while the 42R, 48R and 16Hpolytypes with long-period stacking structure have been reported for the first time. It may be con-cluded that the polytypism existing in parisite is very complicated. However, the polytypes withlong-period stacking sequence are much less than those with short-period stacking sequence.
出处
《矿物学报》
CAS
CSCD
北大核心
1993年第4期331-334,共4页
Acta Mineralogica Sinica
基金
国家教育委员会博士点基金
关键词
氟碳钙铈矿
电子衍射
晶格象
parisite
new polytype
electron diffraction
lattice image
