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Raman, Infrared, and Chemical Characterization of Fly Ash-Generated Spherules

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Journal of Applied Spectroscopy Aims and scope

The majority of studies on silicate glass spherules containing fly ash deal only with the determination of their chemical composition. Nearly 70 vol.% of fly ash is comprised of silicate glass spherules. Here, we report spectroscopic properties of silicate glass spherules using the laser micro-Raman and Fourier transform infrared techniques coupled with refractive index measurements, X-ray diffraction, and electron probe micro-analysis to better ascertain their physical and chemical properties. Glass spherules show similar refractive indices (1.499–1.510) and a bell-shaped diffraction pattern with 5–10 vol.% of crystallites observed on microscopic and submicroscopic scales. The bulk chemical composition of fly ash spherules is predominantly silica-rich (SiO2: 70.96–74.13 wt.%) with a subordinate amount of Al2O3 (0.11–0.69 wt.%), FeO(Total) + MgO (3.6–4.94 wt.%), and CaO + Na2O + K2O (20.83–22.62 wt.%). The infrared spectra suggest the presence of a dissolved –OH– bearing fluid phase in the studied fly ash spherules. The spectra also show symmetric stretching peaks of C–O–C due to the atmospheric CO2 adsorption at 2350 cm–1. The Raman spectra show broad amorphous and/or short-ordered phases.

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Authors and Affiliations

  1. University of Allahabad, Department of Earth and Planetary Sciences, Allahabad, 211 002, India

    A. Niyogi, J. K. Pati & M. Chakarvorty

  2. Indian Institute of Technology, Department of Geology and Geophysics, Kharagpur, 721302, India

    M. K. Panigrahi

  3. EPMA Laboratory (PLANEX), Physical Research Laboratory, Thaltej Campus, Ahmedabad, 380 009, India

    D. Panda

  4. CSIR National Geophysical Research Institute, Hyderabad, 500 007, India

    G. Parthasarathy

Authors
  1. A. Niyogi
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  2. J. K. Pati
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  3. M. K. Panigrahi
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  4. D. Panda
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  5. M. Chakarvorty
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  6. G. Parthasarathy
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Correspondence to A. Niyogi.

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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 85, No. 5, pp. 752–759, September–October, 2018.

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Niyogi, A., Pati, J.K., Panigrahi, M.K. et al. Raman, Infrared, and Chemical Characterization of Fly Ash-Generated Spherules. J Appl Spectrosc 85, 856–863 (2018). https://doi.org/10.1007/s10812-018-0729-y

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  • DOI: https://doi.org/10.1007/s10812-018-0729-y

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