ISSN:
1573-4846
Keywords:
BaO-TiO2-SiO2 gel
;
homogeneity effect
;
crystallization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract In BaO-TiO2-SiO2 system, crystallization from various gel by heating depended on the sol-gel processes and gel homogeneity. Through the condensation reaction of Si(OAc)4 and TiAcAc(O i Pr)3 in tetrahydrofuran solvent, homogeneous TiO2-SiO2 sol with oligomers of relatively large molecular weight was obtained. The gel prepared by mixing the binary sol, Ba(OAc)2, and Si(OMe)4 was the most homogeneous in term of suppression of crystallization. By heating the above gel, only Ba2TiSi2O8 crystal appeared, which was observed in a melt quenched glass. In the case of the gels made by other sol-gel processes, TiO2 or BaTiO3 crystal was first observed from the heated gels prior to the precipitation of Ba2TiSi2O8.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00486276
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