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Relationship between Expandability, MacEwan Crystallite Thickness, and Fundamental Particle Thickness in Illite-Smectite Mixed Layers  

강일모 (연세대학교 지구시스템과학과)
문희수 (연세대학교 지구시스템과학과)
김재곤 (농업기반공사 환경복원팀)
송윤구 (연세대학교 지구시스템과학과)
Publication Information
Journal of the Mineralogical Society of Korea / v.15, no.2, 2002 , pp. 95-103 More about this Journal
Abstract
The object of this study was to interpret the ralationship between expandability (% $S_{XRD}$), MacEwan crystallite thickness ( $N_{CSD}$), and mean fundamental particle thickness ( $N_{F}$ ) in illite-semctite mixed layer (I-S), quantitatively. This interpretation was extracted from comparison of two structural models (MacEwan crystallite model and fundamental particle model) of I-S mixed layers. In I-S structure, % $S_{XRD}$, $N_{CSD}$, and $N_{F}$ are not independent parameters but are related to each others by particular geometric relations. % $S_{XRD}$ is dependent on $N_{CSD}$ by short-stack effect, whereas, % $S_{XRD}$ and $N_{F}$ have relation to smectite interlayer number (Ns)=( $N_{F-}$1)/(100%/% $S_{XRD-}$ $N_{F}$ . Therefore, % $S_{XRD}$ and $N_{F}$ should satisfy a specific physical condition, 1< $N_{F}$ <100%/% $S_{XRD}$, because $N_{s}$ is positive. Based on this condition, this study suggested % $S_{XRD}$ vs $N_{F}$ diagram which can be used to interpret % $S_{XRD}$, $N_{F}$ , $N_{S}$ , and ordering, quantitatively. The diagram was examined by XRD data for I-S samples from Ceumseongsan volcanic complex, Korea. I-S samples showed that $N_{F}$ departs from the physical upper-limit ( $N_{F}$ =100%/% $S_{XRD}$) with decrease in % $S_{XRD}$. This phenomenon may happen due to decrease of stacking-capability of fundamental particles with their thickening.g.s with their thickening.g.
Keywords
illite-smectite mixed layer (I-S); MacEwan crystallite model; fundamental particle model; expandability $(%S_{XRD}$); mean fundamental particle thickness ($N_{F}$); smectite interlayer number($N_{S}$);
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Times Cited By KSCI : 1  (Citation Analysis)
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