Abstract
Hydration behavior of Na-smectite crystals synthesized at a pressure of 5.5 GPa and temperatures of 1400°–1500°C was examined by X-ray powder diffraction at various relative humidities (RH) in the range of 0–100%. The basal spacing of the Na-smectite crystal increased stepwise with increase in RH. The reflections observed were only normal reflections of a single or dual hydration states of smectite. No irrational, intermediate, or asymmetrical reflections were observed. The simple hydration behavior, not known for natural smectite with fine particle sizes and low crystallinity, indicates that the Na-smectite crystals are as perfect as common inorganic crystals with an ordered structure.
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Brindley, G. W. (1984) Order-disorder in clay mineral structure: in Crystal Structures of Clay Minerals and Their X-ray Identification, G. W. Brindley and G. Brown, ed.., Mineralogical Society, London, 125–195.
Fukunaga, O., Yamaoka, S., Endoh, T., Akaishi, M., and Kanda, H. (1979) Modification of belt-like high pressure apparatus: in High Pressure Science and Technology, Vol. 1, K. D. Timmerhaus and M. S. Barber, ed.., Plenum Publishing Co., New York, 846–852.
Güven, N. (1988) Smectite: in Hydrous Phyllosilicate (Exclusive of Micas), Reviews in Mineralogy 19, S. W. Bailey, ed., Mineralogical Society of America, Washington, 497–559.
Howard, J. J. and Roy, D. M. (1985) Development of layer charge and kinetics of experimental smectite alteration: Clays & Clay Minerals 33, 81–88.
Iwasaki, T. and Watanabe, T. (1988) Distribution of Ca and Na ions in dioctahedral smectites and interstratified dioctahedral mica/smectite: Clays & Clay Minerals 36, 73–82.
Lagaly, G. and Weiss, A. (1969) Determination of the layer charge in mica-type layer silicate: in Proc. Inter. Clay Conf. Tokyo 1, L. Heller, J. J. Fripiat, A. Swineford, R. C. Mackenzie, K. H. Wedepohl, and B. B. Zvyagin, ed.., Israel Universities Press, 61–80.
MacEvan, D. M. C. and Wilson, M. J. (1984) Interlayer and intercalation complexes of clay minerals: in Crystal Structures of Clay Minerals and Their X-ray Identification, G. W. Brindley and G. Brown, ed.., Mineralogical Society, London, 197–248.
Moore, D. M. and Hower, J. (1986) Ordered interstratifi-cation of dehydrated and hydrated Na-smectite: Clays & Clay Minerals 34, 379–384.
Nadeau, P. H. and Bain, D. C. (1986) Composition of some smectites and diagenetic illitic clays and implications for their origin: Clays & Clay Minerals 34, 455–464.
Nakazawa, H., Yamada, H., and Fujita, T. (1992) Crystal synthesis of smectite applying very high pressure and temperature: Applied Clay Science 6, 395–401.
Sato, T., Watanabe, T., and Otsuka, R. (1992) Effects of layer charge, charge location, and energy change on expansion properties of dioctahedral smectites: Clays & Clay Minerals 40, 103–113.
Taibudeen, O. and Goulding, K. W. T. (1983) Charge heterogeneity in smectite: Clays & Clay Minerals 31, 37–42.
Watanabe, T. and Sato, T. (1988) Expansion characteristics of montmorillonite and saponite under various relative humidity conditions: Clay Science 7, 129–138.
Yamada, H. and Nakazawa, H. (1992) Stability of ‘high-pressure and high-temperature’ smectite: 1992 Annual Meeting Abstract of Mineralogical Society of Japan, p. 46 (in Japanese).
Yamada, H., Nakazawa, H., Yoshioka, K., and Fujita, T. (1991) Smectites in the montmorillonite-beidellite series: Clay Miner. 26, 359–369.
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Yamada, H., Nakazawa, H., Hashizume, H. et al. Hydration Behavior Of Na-Smectite Crystals Synthesized At High Pressure And High Temperature. Clays Clay Miner. 42, 77–80 (1994). https://doi.org/10.1346/CCMN.1994.0420110
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DOI: https://doi.org/10.1346/CCMN.1994.0420110