Abstract
This work aimed to research the structure models of amorphous materials. Five amorphous and paracrystalline samples (natural or artificial) were investigated via 29Si/27Al nuclear magnetic resonance (NMR) and field emission scanning electron microscopy/energy dispersive spectroscopy (FE-SEM/EDS). The results of NMR showed the resonances of different specimens: -93.2 ppm, -101.8 ppm, -111.8 ppm for natural pozzolana opal shale (POS). These peaks were assigned to the Q2(2OH), Q3(OH)/Q4(1Al) and Q4 respectively. The results of 27Al MAS NMR indicated that Al substituted for Si site in tetrahedral existing in the POS, while the Al/Si atomic ratio in opal was low (around 0.04). For the alkali-silicate-hydrate gel, there were at least three resolved signals assigned to Q0 and Q1, respectively. For the fused silica glass powder, there were the primary signals centered about at the range from -107 to -137 ppm, which were assigned to Q4 units. In addition, the peaks at around -98 and -108 ppm were corresponding to Q3(1OH) and Q4 units existing in aerogel silica structure.
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Funded by the the National Natural Science Foundation of China (Nos.51278086 and 51578108), the Program for New Century Excellent Talents in University by Ministry of Education of the People’s Republic of China (No.NCET-12-0084), China Petroleum Science and Technology Innovation Fund Research Project (No.2013D-5006-0606), Henan Open and Cooperation Project of Science and Technology (No.142106000023), Liaoning BaiQianWan Talents Program (No.2012921073) and Dalian Plan Projects of Science and Technology (No.2013A16GX113)
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Jia, Y., Wang, B. & Zhang, T. A comparative study of different amorphous and paracrystalline silica by NMR and SEM/EDS. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 900–907 (2015). https://doi.org/10.1007/s11595-015-1247-x
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DOI: https://doi.org/10.1007/s11595-015-1247-x