Interstratified illite-montmorillonites

Pillaring solutions. Conventional Al203-pillared montmorillonite and interstratified illite/montmorillonites were prepared using an aluminum chlorohydrate (ACH) solution having an Al-concentration of 0.25 M and an OH/Al-ratio of 2.5, prepared by dilution of a commercial ACH-solution (Locron L, Hoechst). The solution was aged for 20 hr. after dilution, prior to use for preparation of pillared products. 

Properties of Pillared Interstratified Illite/Montmorillonites and of Pillared Reference Montmorillonite... 

Von Engelhard et al [1962] have reported dioctahedral chlorite, mixed with quartz, kaolinite, and considerable interstratified illite-montmorillonite, in clay-marl sediments of the middle Keuper of Wurttemburg. The material does not expand on solvation. The rf(060) values for all the clay components are between 1.490 and 1.504 A. The tetrahedral Al content is 1.1 atoms, judged by the stated definitely whether the chlorite has two dioctahedral sheets or mixed di,tri-octahedral sheets. The 001 reflection at 14.23 A intensifies on heating at 550°C and decreases in spacing to 13.73 A. The interlayer material appears to be unstable, because /(OOl) decreases further to 11.9 A on heating to 700°C. 

Study of an interstratified illite-montmorillonite clay from Worcestershire, England. 

Random mixed-layer illite-montmorillonite is by far the most abundant of the mixed-layer clays. These two types of layers occur intergrown in all proportions. Tables XLV1 and XLVII contain chemical data for a series of mixed-layer illite-montmorillonites with expanded layers ranging from less than 10% to 60%. When expandable layers comprise more than 60% and less than 10% it is difficult to accurately determine the number of illitic layers. Further, Hower (1967) has shown that many of these clays are partially regularly and partially randomly interstratified. This further complicates interpretation of the X-ray data. 

Mixed layered clays are usually randomly interstratified mixtures of illitic lattices with montmorillonitic and/or chloritic lattices. 

Rectorite is one of an almost infinite number of randomly mixed layer clays (411. collectively called illites, which include several other ordered interstratified varieties, including chlorite, corrensite and allevardite. Rectorite has the advantages of a mica and a smectite, in that alternate interlayers are expanding and non-expanding. It may be viewed as an ordered synthetic mica-montmorillonite (SMM) in the nomenclature familiar to catalytic... 

K. Oinuma, and K. Kobayashi, 1965. Interstratified minerals of illite and montmorillonite. 

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