Sol-gel synthesis and characterization of iron doped mullite
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2014
Authors
Ilić, Svetlana M.
Zec, Slavica

Miljković, Miroslav
Poleti, Dejan

Pošarac-Marković, Milica B.

Janaćković, Đorđe

Matović, Branko

Article (Published version)

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Amorphous powders of iron doped 3:2 mullite (3Al(2)O(3)center dot 2SiO(2)) were prepared by sol-gel combustion process using ethanol-water solutions of Al(III) nitrate, Fe(III) nitrate, TEOS and urea. Compositions up to 15 wt% of Fe2O3 were investigated. After combustion and heat treatment at 800 degrees C for 4 h, XRD analysis confirmed that the powders were amorphous. This is in agreement with the thermodynamic predictions that direct formation of mullite has not occurred during the aluminum nitrate - urea combustion reaction. XRD patterns of uniaxially pressed and sintered pellets at 1550 degrees C for 4 h revealed the crystal structure of orthorhombic mullite. The lattice parameters and unit cell volume increases as the mullite solid solutions were enriched by iron. The TGA/DSC analysis showed the reducing of crystallization temperature of iron doped mullites with increasing of iron content in reaction mixtures. The mullitization reaction is two-step process including formation of ...transient spinel phase below 1000 degrees C and mullite crystallization at temperatures about 1200 degrees C. The SEM micrographs of the sintered samples reveal elongated mullite grains with grain length up to 40 mu m. Increasing of the iron content in the reaction mixture enhances the grain size and the grains become elongated and better packed increasing the density of sintered samples.
Keywords:
Ceramics / Sol-gel process / Sintering / Anisotropy / Thermal analysis / X-ray diffractionSource:
Journal of Alloys and Compounds, 2014, 612, 259-264Publisher:
- Elsevier Science Sa, Lausanne
Funding / projects:
DOI: 10.1016/j.jallcom.2014.05.204
ISSN: 0925-8388
WoS: 000339692300042
Scopus: 2-s2.0-84903138081
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Ilić, Svetlana M. AU - Zec, Slavica AU - Miljković, Miroslav AU - Poleti, Dejan AU - Pošarac-Marković, Milica B. AU - Janaćković, Đorđe AU - Matović, Branko PY - 2014 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2687 AB - Amorphous powders of iron doped 3:2 mullite (3Al(2)O(3)center dot 2SiO(2)) were prepared by sol-gel combustion process using ethanol-water solutions of Al(III) nitrate, Fe(III) nitrate, TEOS and urea. Compositions up to 15 wt% of Fe2O3 were investigated. After combustion and heat treatment at 800 degrees C for 4 h, XRD analysis confirmed that the powders were amorphous. This is in agreement with the thermodynamic predictions that direct formation of mullite has not occurred during the aluminum nitrate - urea combustion reaction. XRD patterns of uniaxially pressed and sintered pellets at 1550 degrees C for 4 h revealed the crystal structure of orthorhombic mullite. The lattice parameters and unit cell volume increases as the mullite solid solutions were enriched by iron. The TGA/DSC analysis showed the reducing of crystallization temperature of iron doped mullites with increasing of iron content in reaction mixtures. The mullitization reaction is two-step process including formation of transient spinel phase below 1000 degrees C and mullite crystallization at temperatures about 1200 degrees C. The SEM micrographs of the sintered samples reveal elongated mullite grains with grain length up to 40 mu m. Increasing of the iron content in the reaction mixture enhances the grain size and the grains become elongated and better packed increasing the density of sintered samples. PB - Elsevier Science Sa, Lausanne T2 - Journal of Alloys and Compounds T1 - Sol-gel synthesis and characterization of iron doped mullite EP - 264 SP - 259 VL - 612 DO - 10.1016/j.jallcom.2014.05.204 ER -
@article{ author = "Ilić, Svetlana M. and Zec, Slavica and Miljković, Miroslav and Poleti, Dejan and Pošarac-Marković, Milica B. and Janaćković, Đorđe and Matović, Branko", year = "2014", abstract = "Amorphous powders of iron doped 3:2 mullite (3Al(2)O(3)center dot 2SiO(2)) were prepared by sol-gel combustion process using ethanol-water solutions of Al(III) nitrate, Fe(III) nitrate, TEOS and urea. Compositions up to 15 wt% of Fe2O3 were investigated. After combustion and heat treatment at 800 degrees C for 4 h, XRD analysis confirmed that the powders were amorphous. This is in agreement with the thermodynamic predictions that direct formation of mullite has not occurred during the aluminum nitrate - urea combustion reaction. XRD patterns of uniaxially pressed and sintered pellets at 1550 degrees C for 4 h revealed the crystal structure of orthorhombic mullite. The lattice parameters and unit cell volume increases as the mullite solid solutions were enriched by iron. The TGA/DSC analysis showed the reducing of crystallization temperature of iron doped mullites with increasing of iron content in reaction mixtures. The mullitization reaction is two-step process including formation of transient spinel phase below 1000 degrees C and mullite crystallization at temperatures about 1200 degrees C. The SEM micrographs of the sintered samples reveal elongated mullite grains with grain length up to 40 mu m. Increasing of the iron content in the reaction mixture enhances the grain size and the grains become elongated and better packed increasing the density of sintered samples.", publisher = "Elsevier Science Sa, Lausanne", journal = "Journal of Alloys and Compounds", title = "Sol-gel synthesis and characterization of iron doped mullite", pages = "264-259", volume = "612", doi = "10.1016/j.jallcom.2014.05.204" }
Ilić, S. M., Zec, S., Miljković, M., Poleti, D., Pošarac-Marković, M. B., Janaćković, Đ.,& Matović, B.. (2014). Sol-gel synthesis and characterization of iron doped mullite. in Journal of Alloys and Compounds Elsevier Science Sa, Lausanne., 612, 259-264. https://doi.org/10.1016/j.jallcom.2014.05.204
Ilić SM, Zec S, Miljković M, Poleti D, Pošarac-Marković MB, Janaćković Đ, Matović B. Sol-gel synthesis and characterization of iron doped mullite. in Journal of Alloys and Compounds. 2014;612:259-264. doi:10.1016/j.jallcom.2014.05.204 .
Ilić, Svetlana M., Zec, Slavica, Miljković, Miroslav, Poleti, Dejan, Pošarac-Marković, Milica B., Janaćković, Đorđe, Matović, Branko, "Sol-gel synthesis and characterization of iron doped mullite" in Journal of Alloys and Compounds, 612 (2014):259-264, https://doi.org/10.1016/j.jallcom.2014.05.204 . .