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https://doi.org/10.5562/cca3276

Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro

Mira Ristić ; Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002, Zagreb, Croatia
Stjepko Krehula ; Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002, Zagreb, Croatia
Svetozar Musić ; Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002, Zagreb, Croatia

Puni tekst: engleski, pdf (2 MB) str. 65-70 preuzimanja: 528* citiraj
APA 6th Edition
Ristić, M., Krehula, S. i Musić, S. (2018). Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro. Croatica Chemica Acta, 91 (1), 65-70. https://doi.org/10.5562/cca3276
MLA 8th Edition
Ristić, Mira, et al. "Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro." Croatica Chemica Acta, vol. 91, br. 1, 2018, str. 65-70. https://doi.org/10.5562/cca3276. Citirano 09.03.2021.
Chicago 17th Edition
Ristić, Mira, Stjepko Krehula i Svetozar Musić. "Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro." Croatica Chemica Acta 91, br. 1 (2018): 65-70. https://doi.org/10.5562/cca3276
Harvard
Ristić, M., Krehula, S., i Musić, S. (2018). 'Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro', Croatica Chemica Acta, 91(1), str. 65-70. https://doi.org/10.5562/cca3276
Vancouver
Ristić M, Krehula S, Musić S. Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro. Croatica Chemica Acta [Internet]. 2018 [pristupljeno 09.03.2021.];91(1):65-70. https://doi.org/10.5562/cca3276
IEEE
M. Ristić, S. Krehula i S. Musić, "Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro", Croatica Chemica Acta, vol.91, br. 1, str. 65-70, 2018. [Online]. https://doi.org/10.5562/cca3276

Sažetak
Microstructural properties of white bauxite from Montenegro were investigated. XRD analysis showed the presence of allophane (Al2O3 · 2SiO2 · 3H2O) and gibbsite (γ-Al(OH)3). The allophane phase showed very broadened diffraction lines, thus indicating poor crystallinity as well as very fine nanoparticles in this phase. Upon heating of natural allophane/gibbsite at 1000 °C mullite (Al6Si2O13) was formed, but with a lower degree of crystallinity. FT-IR spectra of allophane, gibbsite and mullite were interpreted. FE-SEM images of natural allophane/gibbsite showed a dominantly amorphous-like morphology. Upon heating of natural allophane/gibbsite two-dimensional (2D) microstructure was visible. EDS analysis showed traces of calcium, potassium, magnesium and iron. The 57Fe Mössbauer spectrum of iron traces showed a small relative intensity magnetic splitting component due to the presence of hematite and a central quadrupole doublet due to the presence of Fe3+ ions substituted for Al3+ in octahedral positions and/or a superparamagnetic fraction of hematite particles. The possible geochemical mechanism of white bauxite formation in Montenegro is discussed.

Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License.

Ključne riječi
allophane; gibbsite; white bauxite, Montenegro

Hrčak ID: 195341

URI
https://hrcak.srce.hr/195341

Posjeta: 716 *