Hydrothermalsynthese Und Strukturuntersuchung Von Montmorillonit
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Die hier beschriebenen Versuche lassen sich wie folgt zusammenfassen: 1. Als Grundlage für Strukturuntersuchungen an Montmorilloniten wurden Glieder der Montmorilloni tgruppe synthetisch dargestellt. Die R.nge- stellten Versuche wurden in einem Autoklaven bei Drucken von 5C -500 atm durchgeführt. 2. Entsprechend der chemischen Zusammensetzung natürlicher Montmorillo- nite gelang es, die analogen synthetischen Verbindungen zu erhalten (Montmorillonit von Cypern, Chambers, Hector und Nontronit von Petrowsk). 3. In einer Versuchsreihe mit wechselnder Zusammensetzung der Oktaeder- 2 schicht (Al3+, Mg +) wurde der Ubergang vom di- zum trioktaedrischen Mineral verfolgt und festgestellt, da die 060-Interferenz zur Unt- scheidung von beiden Grenzfällen geeignet ist. Ferner bedingt die Zu- 2 nahme des Mg +- und die entsprechende Abnahme des Al3+_Gehaltes in der Oktaederschicht eine Zunahme des d-Wertes der Kreuzgitterinter- renz. Die Änderung der b-Achse steht in befriedigender tlbereinstim- mung mit der von McEWAN abgeleiteten empirischen Formel. 2 4. Es wurde eine Reihe weiterer Montmorillonite synthetisiert mit Ni +, + 2+ Li und Zn in oktaedrischer Koordination. 5. Die Synthese eines Modell-Montmorillonites mit Ga3+ und Ge4+ anstelle 3 4 von Al + und Si + führte zu keinem befriedigenden Ergebnis. 6. Interessante Ergebnisse zeigten unsere Versuche mit Si0 -Ausgangs- 2 material verschiedener Fehlordnungsgrade. Es wurde insbesondere die Umwandlung von in natürlichem Bentonit auftretendem "Opal" durch Zu- gabe entsprechender Mengen von Al(OH) unter hydrothermalen Bedin- 3 gungen verfolgt. In allen Fällen wurde eine deutliche Abhängigkeit der Umsetzung vom Fehlordnungsgrad und damit von der Reaktionsfähig- keit des untersuchten Materials beobachtet.
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