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Low-Temperature Synthesis of Micas under Conventional- and Microwave-Hydrothermal Conditions

Published online by Cambridge University Press:  01 January 2024

Sridhar Komarneni  and
Bharat L. Newalkar
Sridhar Komarneni*
Affiliation:
Department of Crop and Soil Sciences, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
Bharat L. Newalkar*
Affiliation:
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@psu.edu
†Current address: Corporate R&D Centre, Bharat Petroleum Corporation Limited, Plot 2A, Udyog Kendra, Greater Noida-201306, India
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Abstract

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.

Keywords

HydrothermalMicrowave-hydrothermalRb-micaSeedingZn Mica
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 6 , December 2003 , pp. 693 - 700
Copyright
Copyright © 2003, The Clay Minerals Society

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