Abstract
Using a simple ionic model, the energy necessary to expand a layer structure by a certain distance can be calculated. This has been done for a series of 15 structures including hydroxides, 2:1 and 1:1 structures of various types. Plots of energy versus separation distance show three major groups which have common bonding properties. For large separations, the group with the strongest interlayer bonds contains the brittle micas, the hydroxides, and the 1:1 structures. Intermediate bonding structures are the normal micas and the weakest bonds occur in the zero layer charge 2:1 structures. The relative energies needed for a given separation are not constant so that for small separations the zero layer charge structures such as talc and pyrophyllite are more strongly bonded than the normal micas. These groupings correlate very well with the expandability of the structures by water and other substances. It is proposed that this approach to the study of the layer structures will provide a simple theory explaining the expansion properties of layer silicates.
Резюме
Используя простую ионную модель,можно вычислить энергию,необходимую для расширения слоистой структуры на определенное расстояние. Это было проделано для серии из 15 структур,включая гидроокиси,структуры 2:1 и 1:1 различных типов. Графики зависимости энергии от расстояния разделения указывают на 3 главных группы,которые имеют характерные связующие свойства. При большом разделении группа с сильнейшими межслойными связями включает хрупкие слюды,гидроокиси и структуры 1:1. Структурами с промежуточными связями являются структуры нормальных слюд, и слабейшими связями обладают структуры 2:1 со слоями,имеющими нулевые заряды. Относительные величины энергии,необходимые для данного разделения,не являются постоянными.Так при небольших разделениях структуры со слоями,имеющими нулевые заряды,такие как тальк и пирофиллит,связаны сильнее,чем нормальные слюды. Это группирование очень хорошо коррелируется со способностью структур к расширению водой и другими жидкостями. Предполагается использовать этот метод для изучения слоистых структур,что обеспечит простую теорию для объяснения свойств расширения слоистых силикатов.
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Giese, R.F. The Electrostatic Interlayer Forces of Layer Structure Minerals. Clays Clay Miner. 26, 51–57 (1978). https://doi.org/10.1346/CCMN.1978.0260106
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DOI: https://doi.org/10.1346/CCMN.1978.0260106