Abstract
Aluminium-free layered silicate hydrates (metal silicate hydrates — M-SH) are an interesting supplement to the well-known zeolite-like porous materials, due to their large number of catalytic, adsorptive and ion-exchange properties. By means of a combination of X-ray diffraction investigations and several thermo-analytic methods (TG, DSC, TMA) it could be shown that the properties of magadiite will be influenced by the cations located in the interlayer and the morphology of the as-synthesized magadiite products. In particular, hydration behaviour and phase transformation behaviour of the magadiite will be affected. Thus, H- and Ce-magadiite are stable up to temperatures of about 800‡C, while the as-synthesized Na-forms will loss water irreversible already at about 200‡C, will be dehydroxylated, and will be decomposed structurally at about 400‡C.
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