Crystallization Kinetics of <TEX>$PbO-TiO_2-SiO_2-B_2O_3$</TEX> Glasses by DSC

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J. Korean Ceram. Soc. > Volume 32(12); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(12): 1331.

DSC에 의한 $PbO-TiO_2-SiO_2-B_2O_3$계 유리의 결정화 속도

손명모, 이승호¹, 이헌수, 박희찬²

대구공업전문대학 요업과
¹경북지방 공업기술원
²부산대학교 무기재료공학과

Crystallization Kinetics of $PbO-TiO_2-SiO_2-B_2O_3$ Glasses by DSC

ABSTRACT

The glass-ceramics for ferro-electric were made from compositions of 70PbO.16TiO2.8SiO2.4B2O3.2AlPO4 (wt%) and 67.5PbO.20TiO2.8.5SiO2.2B2O3.2AlPO4 (wt%). The crystallization kinetics for PbTiO3 crystalline phase formation from glass was studied using non-isothermal DSC techniques. The values of activation energy, ΔE using variables of heating rate and temperature were calculated at various reaction fractions obtained from peak area over DSC. The results indicated that activation energy was lowest at 60% reaction fractions and the activation energy of glass containing 20.0 wt% TiO2 is higher than that of glass containing 16.0 wt% TiO2. The crystallization mechanism was three dimensional growth (n=4).

Key words: Crystallization kinetics, Glass-ceramics, Ferro-electrics, $PbTiO_3$ crystalline phase, DSC