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Clays and Clay Minerals; December 2003; v. 51; no. 6; p. 693-700; DOI: 10.1346/CCMN.2003.0510612
© 2003 Clay Minerals Society
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LOW-TEMPERATURE SYNTHESIS OF MICAS UNDER CONVENTIONAL- AND MICROWAVE-HYDROTHERMAL CONDITIONS

Sridhar Komarneni1,* and Bharat L. Newalkar1,{dagger}

1 Department of Crop and Soil Sciences, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA

* E-mail address of corresponding author: komarneni{at}psu.edu

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 150–200°C and a novel Zn Rb-mica with Zn in the octahedral sheets and Rb in the interlayers was synthesized at 200°C. The synthesis of either Mg, Co or Ni K-micas, however, was found to be difficult or impossible at these low temperatures. Solid-state 29Si MAS-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.

Key Words: Hydrothermal • Microwave-hydrothermal • Rb-mica • Seeding • Zn Mica






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