Determination of the Nucleation Rate Curve for Lead Titanate in the PbO-TiO<TEX>$_2$</TEX>-B<TEX>$_2$</TEX>O<TEX>$_3$</TEX>-BaO  by Diffferential Thermal Analysis

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J. Korean Ceram. Soc. > Volume 35(6); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(6): 640.

PbO-TiO$_2$-B$_2$O$_3$-BaO 계 유리에서 PbTiO$_3$ 결정의 핵생성 곡선 결정을 위한 열시차분석법의 응용

이선우, 심광보¹, 오근호²

한양대학교 신소재 공정공학원
¹한양대학교 세라믹 공정 연구센터
²한양대학교 세라믹공정연구센터

Determination of the Nucleation Rate Curve for Lead Titanate in the PbO-TiO$_2$-B$_2$O$_3$-BaO by Diffferential Thermal Analysis

ABSTRACT

Nucleation and crystallzation of a quaternary glass system for lead titanate glass-ceramics were in-vestigated using DTA(differential thermal analysis ) with variation of nucleation temperature and crystal growth time. Glass samples containing 60mol% of PbO-{{{{ { TiO}_{2 } }} were prepared from melts by the conventional normal cooling method in a cylindrical brass mould. The glass sample was nucleated between 40$0^{circ}C$ and 50$0^{circ}C$ for a given time and showed the maximum nucleation rate at 46$0^{circ}C$ The DTA crystallization peak temperature decreased with increasing nucleating time and decreasing heating rate during DTA runs which indicated an increase of the number of nuclei produced in the system

Key words: Lead titanate glass-ceramics, Nucleation, Crystallization, DTA, Nucleation curve