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Dehydration behaviors of interlayer water in synthetic Buserites
최헌수,Soo Jin Kim,김정진 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.3
The structural changes of synthetic buserites (10phases), hydrous phyllomanganates, have been studied as a func-tion of exchangeable interlayer cations and the relative humidity(RH) at which the sample is equilibrated. This study shows thatthe basal spacing of buserites and their-dehydration products varyayer cations and water molecules.Na-buserite transforms directly to 7 phase even in air dry. Ca-buserite does not easily transform to 7 phase even in a low RH.With increasing temperature, Mg-buserite transforms very slowlythrough progressive intermediate phases to 7 phase at about200C, whereas Zn-buserite transforms directly to 7 phase atabout 60C. Both Mg-and Zn-buserites do not dehydrate to 7phase even in a very low RH.
장군광산에서 산출되는 (Ca, Mg)-부서라이트의 화학조성과 탈수현상에 관한 연구
최헌수,김수진 한국광물학회 1992 광물과 암석 (J.Miner.Soc.Korea) Vol.5 No.2
The natural (Ca, Mg)-buserite has been identified from the manganese oxideores of the Janggun mine, Korea, which have been formed by supergene weathering of sedimentary-metamorphic rhodochrosite. It occurs together with rancieite forming one very fine-grained buserite-rancieite flake. This (Ca, Mg)-buserite-rancieite occurs as microcystalline flaky crystals. It precipitated around the fine-grained takanelite aggregate. Electron microprobe analyses give the formula (Ca.08Mg.07Mn.052+)Mn.894+O2·1.46H2O for (Ca, Mg)-buserite. The dehydration experiments by relative humidity control and heating as well as rehydration experiment by relative humidity control show that (Ca, Mg)-buserite dehydrates completely at 90℃ and rehydrates up to 27% of the original state. The dehydration at 26% RH (corresponding to heating to about 40℃) is characterized by thedecrease in the decrease in the intensity of 9.86a peak with slight shifting to 9.60a. It is due to the loss of weakly bound water molecules in the interlayer. The dehydration from 40℃ to 90℃ is characterized by the gradual shifting of 001 peak from 9.6a to 7.42a. It is due to the loss of weakly bound water molecules in the interlayer.