Effect of Aluminum Doping on the Performance and Microstructure of Methyl-Modified SiO2 Sol. Issue 207 (3rd May 2020)

• Record Type: Journal Article
• Authors: Yang, Jing; Xu, Zhirun; Mu, Ruihua; Zhao, Yamei; Li, Bo; Hou, Haiyun
• Is Part Of: Integrated ferroelectrics. Issue 207(2020)
• Page Start: 220
• Page End: 230
• Publication Date: 2020-05-03
• Subjects: Sol-gel method -- Al2O3/SiO2 sol -- Gibbs energies of activation for viscous flow -- Particle size distribution; Ferroelectric devices -- Periodicals; Integrated circuits -- Periodicals; 537.244805
• DOI: 10.1080/10584587.2020.1728682
• Languages: English
• ISSNs: 1058-4587

Abstract

Abstract: With methyltriethoxysilane as hydrophobic precursors and aluminum isopropoxide as the aluminum source, the Al2 O3 /SiO2 sols and their gel materials were prepared. The effects of aluminum content ( nAl ) on the viscosity ( η ), density ( ρ ), reaction rate constant ( k ), Gibbs energies of activation for viscous flow ( ΔG *), particle size of Al2 O3 /SiO2 sols were studied. And the high temperature calcined materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The results show that, with the increase of nAl, the η, n and ΔG * values of the Al2 O3 /SiO2 sols decrease while the k and ρ values and average particle sizes increase. There is strong intermolecular interaction between the Al2 O3 and SiO2 sol molecules. The Al-O-Si bond exists in the Al2 O3 /SiO2 materials before and after calcination at 350 °C. Calcination at 350 °C in N2 atmosphere can change the phase structure of Al2 O3 /SiO2 sample greatly, which can make the γ -AlOOH in the Al2 O3 /SiO2 gel material convert to γ -Al2 O3 through dehydration.