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The crystal-chemistry of a series of synthetic Al–Fe 3+ smectites was studied in detail using near and mid infrared spectroscopy. Chemical and NIR data indicated a quite complete range of octahedral Al for Fe 3+ substitution, and therefore, the solid-solution between beidellite and nontronite end-members was continuous and complete. The wavenumbers of several infrared absorption bands...
The hydrothermal synthesis of smectites in the Al–Fe 3+ chemical series was investigated at various pHs and temperatures using stoichiometric coprecipitated hydrogels. For the first time, Al–Fe 3+ smectites within a wide compositional range were successfully synthesized. The windows of experimental conditions to crystallize such smectites are narrow. Temperatures up to 150°C and high...
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