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Crystallization behavior of alkoxy-derived cordierite gels
dc.creator | Petrović, R | |
dc.creator | Janaćković, Đorđe T. | |
dc.creator | Zec, Slavica | |
dc.creator | Drmanic, S | |
dc.creator | Kostic-Gvozdenovic, LJ | |
dc.date.accessioned | 2018-03-01T19:19:01Z | |
dc.date.available | 2018-03-01T19:19:01Z | |
dc.date.issued | 2003 | |
dc.identifier.issn | 0928-0707 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/2664 | |
dc.description.abstract | Alkoxy-derived cordierite gels were synthesized from tetraethylorthosilicate (TEOS), aluminum isopropoxide (Al(OPri)(3)), and magnesium ethoxide (Mg(OEt)(2)). TEOS was partially hydrolyzed at molar ratios H2O/TEOS=1.2, in the presence of hydrochloric acid as a catalyst, HCl/TEOS=0.1. Aluminum and magnesium alkoxides were added successively or as a double alkoxide. Phase transformations occurring in the gel were studied by differential thermal analysis, x-ray diffractometry, and Fourier-transform infrared spectroscopy. In all cases, mu-cordierite crystallized at similar temperatures (950-1000degreesC) with small amounts of spinel, which confirms dominant influence of the optimal conditions for partial hydrolysis of TEOS on the gels homogeneity. The transformation of mu- into alpha-cordierite began at about 1100degreesC. Broadening of diffraction peaks and appearance of new bands in the FT IR spectra confirmed the transformation of alpha- into modulated beta-cordierite at temperatures above 1300degreesC. Differential thermal analysis under nonisothermal conditions also proved homogeneous nucleation with constant rate and three-dimensional crystallite growth during mu-cordierite crystallization. The overall activation energy of the crystallization of mu-cordierite is 580+/-81 kJ/mol. | en |
dc.rights | restrictedAccess | en |
dc.source | Journal of Sol-gel Science and Technology | en |
dc.subject | cordierite | en |
dc.subject | sol-gel process | en |
dc.subject | phase transformations | en |
dc.subject | kinetics of crystallization | en |
dc.title | Crystallization behavior of alkoxy-derived cordierite gels | en |
dc.type | article | en |
dcterms.abstract | Петровиц, Р; Јанацковиц, ДЈ; Дрманиц, С; Костиц-Гвозденовиц, ЛЈ; Зец Славица; | |
dc.citation.volume | 28 | |
dc.citation.issue | 1 | |
dc.citation.spage | 111 | |
dc.citation.epage | 118 | |
dc.identifier.wos | 000185229200015 | |
dc.identifier.doi | 10.1023/A:1025649406466 | |
dc.citation.rank | M21a | |
dc.identifier.scopus | 2-s2.0-0141990994 |
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