Abstract
THE crystalline swelling of lithium montmorillonite before and after heating has been investigated by several workers1–3. Hofmann and Klemen1 suggested that, on heating, the small lithium ion migrated into the crystal lattice to occupy a vacant octahedral site with consequent neutralization of the charge originating in that layer due to the isomorphous replacement of Al3+ by Mg2+. They termed this ‘place exchange’. This process gives rise to marked reduction in crystalline swelling.
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References
Hofmann, U., and Klemen, R., Z. anorg. Chem., 62, 95 (1950).
Greene-Kelly, K., Clay Minerals Bull., 2, 52 (1953).
Greene-Kelly, R., Min. Mag., 30, 604 (1955).
Johns, W. D., and Tettenhorst, R. T., Amer. Min., 44, 894 (1959).
Aylmore, L. A. G., and Quirk, J. P., Nature, 183, 1752 (1959).
Aylmore, L. A. G., and Quirk, J. P., National Clay Conference, Purdue University (1960) (in preparation).
Norrish, K., and Quirk, J. P., Nature, 173, 225 (1954).
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QUIRK, J., THENG, B. Effect of Surface Density of Charge on the Physical Swelling of Lithium Montmorillonite. Nature 187, 967–968 (1960). https://doi.org/10.1038/187967a0
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DOI: https://doi.org/10.1038/187967a0
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