TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Nenadović, Snežana S.
AU  - Nenadović, Miloš
AU  - Bundaleski, Nenad
AU  - Todorović, Bratislav Ž.
AU  - Pavlović, Vladimir B.
AU  - Rakočević, Zlatko Lj.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1579
AB  - This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 degrees C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGp:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 degrees C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 degrees C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 degrees C.
T2  - Ceramics International
T1  - Structural and chemical properties of thermally treated geopolymer samples
VL  - 43
IS  - 9
SP  - 6700
EP  - 6708
DO  - 10.1016/j.ceramint.2017.02.066
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Nenadović, Snežana S. and Nenadović, Miloš and Bundaleski, Nenad and Todorović, Bratislav Ž. and Pavlović, Vladimir B. and Rakočević, Zlatko Lj.",
year = "2017",
abstract = "This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 degrees C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGp:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 degrees C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 degrees C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 degrees C.",
journal = "Ceramics International",
title = "Structural and chemical properties of thermally treated geopolymer samples",
volume = "43",
number = "9",
pages = "6700-6708",
doi = "10.1016/j.ceramint.2017.02.066"
}

Kljajević, L. M., Nenadović, S. S., Nenadović, M., Bundaleski, N., Todorović, B. Ž., Pavlović, V. B.,& Rakočević, Z. Lj.. (2017). Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International, 43(9), 6700-6708.
https://doi.org/10.1016/j.ceramint.2017.02.066

Kljajević LM, Nenadović SS, Nenadović M, Bundaleski N, Todorović BŽ, Pavlović VB, Rakočević ZL. Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International. 2017;43(9):6700-6708.
doi:10.1016/j.ceramint.2017.02.066 .

Kljajević, Ljiljana M., Nenadović, Snežana S., Nenadović, Miloš, Bundaleski, Nenad, Todorović, Bratislav Ž., Pavlović, Vladimir B., Rakočević, Zlatko Lj., "Structural and chemical properties of thermally treated geopolymer samples" in Ceramics International, 43, no. 9 (2017):6700-6708,
https://doi.org/10.1016/j.ceramint.2017.02.066 . .