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- W2181581519 abstract "The chemical composition and the thermal behavior of sodium and hydrogen octosilicate was studied by chemical and thermal analysis, infrared (IR), magic-angle-spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, and X-ray diffractometry. Both compounds are layer silicates with basal spacings of 11.10 and 7.38 ~, respectively. In both forms the ratio of Q4 silicon (connected via oxygen bridges with four silicon atoms) to Q3 silicon (connected with only three other Si atoms) is I. At least a small part of the Q4 silicon can be substituted by aluminum. Elimination of water coordinated to the cations in sodium octosilicate results in a concomitant structural collapse. Replacement of the sodium ions by protons affects the atomic arrangement in the sheets only to a minor degree, but results in a decrease of the periodicity along the crystallographic c axis. Upon heat treatment an endothermal structural rearrangement occurs at about 360 K as revealed by significant changes of the IR and 29Si MAS-NMR spectra. Reexchange with Na ions largely, but not completely, restores the structure of the parent octo- silicate. The X-ray diffraction pattern of sodium octosilicate was indexed in the monoclinic system with a = 7.345/~, b = 12.74/~, c = 11.25/~ and t3 = 99.3*. Based on conclusions drawn from the results of the present study, the X-ray pattern of hydrogen oclosilicate was tentatively indexed in the monoclinic system with a = 7.345/k, b = 12.74 A, c = 8.51 /~ and/3 = 119.8 ~" @default.
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- W2181581519 date "1991-01-01" @default.
- W2181581519 modified "2023-09-27" @default.
- W2181581519 title "CHEMICAL CHARACTERIZATION, FEATURES, AND THERMAL BEHAVIOR OF SODIUM AND HYDROGEN OCTOSILICATE" @default.
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