Sol–gel synthesis and characterization of iron doped mullite

• Published in: Journal of alloys and compounds Vol. 612; pp. 259 - 264
• Main Authors: Ilić, S., Zec, S., Miljković, M., Poleti, D., Pošarac-Marković, M., Janaćković, Dj, Matović, B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 05.11.2014; Elsevier
• Subjects: Anisotropy; Ceramics; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Materials synthesis; materials processing; Methods of crystal growth; physics of crystal growth; Physics; Sintering; Sol–gel process; Thermal analysis; X-ray diffraction; X-ray diffraction; Ceramics; Thermal analysis; Sol–gel process; Anisotropy; Sintering; Aluminium oxide; Differential scanning calorimetry; Crystallization; Doping; Thermogravimetry; XRD; Amorphous state; Heat treatments; Solid solutions; Silicon oxides; Spinels; Orthorhombic lattices; Iron additions; Sol-gel process
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.05.204

Amorphous powders of iron doped 3:2 mullite (3Al2O3⋅2SiO2) were prepared by sol–gel combustion process using ethanol-water solutions of Al(III) nitrate, Fe(III) nitrate, TEOS and urea. Compositions up to 15wt% of Fe2O3 were investigated. After combustion and heat treatment at 800°C for 4h, 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°C for 4h 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°C and mullite crystallization at temperatures about 1200°C. The SEM micrographs of the sintered samples reveal elongated mullite grains with grain length up to 40μm. 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.