Crystallization mechanism analysis at low temperature of sol-gel-derived barium titanate using synchrotron XAFS measurement

Abstract

An investigation has been made on the local structure and the gel to crystalline conversion mechanism in BaTiO₃ gels derived from hydrolysis of concentrated Ba, Ti alkoxide precursor solution with a Ba/Ti molar ratio of 1.00 during aging at 30 degree by means of Ba L_{_III_}-edge EXAFS, Ti K-edge XANES. The results indicate that the spectrum of the BaTiO₃ gels changed by the aging time, and finally, the spectrum of the BaTiO₃ gels aged at 30 degree for 120h is similar to the spectrum of the commercial BaTiO₃ powders.