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Low-temperature Synthesis of Micas Under Conventional- and Microwave-Hydrothermal Conditions

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Several micas containing different octahedral and interlayer cations were synthesized at different temperatures under conventional-and microwave-hydrothermal conditions and these phases were characterized by powder X-ray diffraction, solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. A Zn K-mica with Zn in the octahedral sheets and K in the interlayers was synthesized in the temperature range 150 -200ºC and a novel Zn Rb-mica with Zn in the octahedral sheets and Rb in the interlayers was synthesized at 200ºC. The synthesis of either M g,Co or Ni K-micas,however,was found to be difficultor impossible at these low temperatures. Solid-state 29Si M AS-NMR revealed that the Al in the tetrahedral sites is disordered with several nearest-neighbor Si environments. In general, microwave-assisted hydrothermal conditions led to better crystallization of the Zn K-micas compared with the conventional method.


Document Type: Research Article


Publication date: 2003-12-01

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