摘要
采用最大拉力圆环法精确系统地测量了锗酸铋熔体体系xBi2O3-(1-x)GeO2在0.15<x≤0.86范围内的表面张力.结果表明:当x≤0.40时,熔体的表面张力随温度的升高而增加;当x≥0.40时,熔体的表面张力随着温度的升高而减小.通过对实验数据的拟合,讨论了表面张力的温度系数dγ/dt和体积膨胀系数β等热力学性质.着重讨论了锗酸铋熔体出现的正表面张力系数,并指出单靠Gibbs吸附原理来解释表面张力的温度系数的正负问题是不够完善的.
The surface tensions of xBi203-（1-x）GeO2 melts of different compositions with 0.15〈x≤0.86 have been measured precisely and systematically by using thering method. The results obtained show that from their melting points up to 1 480 K, when x≤0.40 the surface tensions of the melts increase with the increasing temperature, while x i≥0.40 the values of the surface tension decreased with the increasing temperature. In addition, the temperature coefficients of the surface tension （dγ/dT） and the volume expansion coefficient （β） are calculated from the fitting curves of the surface tension and the density, respectively. The positive and negative temperature coefficients of surface tension have been observed in bismuth germanate system. We discuss further the positive temperature coefficients and a conclusion is drawn that the positive temperature coefficients of the surface tension can not been explained well only by the Gibbs adsororption rule.
出处
《江西师范大学学报（自然科学版）》
CAS
北大核心
2011年第5期488-493,共6页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
国家自然科学基金(11047022)
贵州省科学技术基金(黔科合J字2010[2141])资助项目
关键词
锗酸铋熔体
表面张力
热力学性质
bismuth germanate melts
surface tension
thermodynamic properties
