화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.133, No.1, 69-77, 2012
Study of glass-nanocomposite and glass-ceramic containing ferroelectric phase
Transparent glass nanocomposite in the pseudo binary system (100 - x) Li2B4O7-xBaTiO(3) with x = 0 and 60 (in mol%) were prepared. Amorphous and glassy characteristics of the as-prepared samples were established via X-ray powder diffraction (XRD) and differential scanning calorimetry (DSC) respectively. The precipitated BaTiO3 nanocrystal phase embedded in the glass sample at x = 60 mol% was identified by transmission electron microscopic (TEM). The optical transmission bands at 598 and 660 nm were assigned to Ti3+ ions in tetragonal distorted octahedral sites. The precipitated Li2B4O7, BaTi(BO3)(2) and BaTiO3 nanocrystallites phases with heat-treatment at 923 K for 6 h (HT923) in glass-ceramic were identified by XRD, TEM and infrared absorption spectroscopy. The as-prepared at x = 60 mol% and the HT923 samples exhibit broad dielectric anomalies in the vicinity of the ferroelectric-to-paraelectric transition temperature. The results demonstrate that the method presented may be an effective way to fabricate ferroelectric host and development of multifunctional ferroelectrics. (C) 2011 Elsevier B.V. All rights reserved.