Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)

Authors

  • Ljiljana M Kljajević Laboratory for Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade
  • Zuzana Melichova Department of chemistry, Faculty of Natural Sciences, Matej Bel University, Banska Bistrica
  • Marija Stojmenović Laboratory for Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade
  • Bratislav Ž Todorović Faculty of Technology, University of Niš
  • Vladimir B Pavlović Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, University of Belgrade, Belgrade
  • Nada Čitaković University of Defence, Military Academy, Belgrade
  • Snežana S Nenadović Laboratory for Materials Science, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade

DOI:

https://doi.org/10.20450/mjcce.2019.1678

Keywords:

metabentonite, metakaolin, metadiatomite, geopolymer, electrical conductivity

Abstract

Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composition. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 × 10–2 Ω–1cm–1at 700 ºC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500–700 ºC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Oxide Fuel Cell).

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Published

2019-12-30

How to Cite

Kljajević, L. M., Melichova, Z., Stojmenović, M., Todorović, B. Ž, Pavlović, V. B., Čitaković, N., & Nenadović, S. S. (2019). Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite). Macedonian Journal of Chemistry and Chemical Engineering, 38(2), 283–292. https://doi.org/10.20450/mjcce.2019.1678

Issue

Vol. 38 No. 2 (2019)

Section

Materials Engineering

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