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Regularity of Interstratification as Affected by Charge Density in Layer Silicates
Author(s) -
Sawhney B. L.
Publication year - 1969
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1969.03615995003300010015x
Subject(s) - mica , sorption , vermiculite , layer (electronics) , mineral , monolayer , mineralogy , clay minerals , materials science , geology , chemistry , composite material , adsorption , nanotechnology , metallurgy
Successively larger sorptions of Cs or K by most Ca‐saturated vermiculites collapsed their alternate layers, producing regularly interstratified mica‐vermiculite layer sequences. Additional sorption then collapsed the expanded layers within the interstratified mineral until the entire sample was collapsed to the mica structure. Sorption of Cs or K by Ca‐saturated montmorillonites, on the other hand, did not collapse their interlayers even when almost half of their exchange sites were occupied by Cs or K. Additional sorption then collapsed some layers producing random, not regular, interstratification. The ease of collapse of interlayers and the subsequent regularity of interstratification was related to the layer charge density of the mineral. The large charge density in vermiculite collapses the layers readily on Cs or K sorption. The collapse in one layer prevents the entry of these cations in the adjacent layer, producing regularly interstratified mica‐vermiculite layer sequences. The lack of collapse and the random interstratification in montmorillonites, on the other hand, is attributed to their small charge density.