二元系统分相的普适性及普适常数

THE UNIVERSALITY AND UNIVERSAL CONSTANTS OF PHASE SEPARATION IN BINARY SYSTEMS

作者最近的一些研究结果表明,二元系统临界点两边的分相曲线可以表达为:(x-x_c)/x_c=A(T_c-T)/T)^(1/3),(x′-x_c)/x_c=A′(T_c-T)/T_c)^(1/3)。这里A、A′是普适常数,前式表示靠近玻璃形成体的一边,后式表示靠近玻璃修饰体的一边。本文通过对亚稳分相系统Li_2O-SiO_2,Na_2O-SiO_2,BaO-SiO_2及稳态分相系统RO-SiO_2(R=Mg,Ca,Sr),R_2O_3-SiO_2(R=La,Nd,Sm,Gd,Yb),RO-B_2O_3(R=Mg,Ca,Sr,Ba)的分析,得出了亚稳分相及稳态分相系统的普适常数,它们分别为A=-1.8305,A′=2.3551及A=-1.7020,A′=3.5465。这些常数可望适用于更广泛的二元稳态及亚稳分相系统。

It is believed that all binary immiscibility boundaries in two sides of critical point can be expressed as (x-x_c)/x_c=A[(T_c-T)/T_c]^(1/3) and(x′-x_c)/x_c=A′[(T_c-T)/T_c]^(1/3) respectively, here A and A′ are universal constants, and the former represent the side near the glass former and the latter the side near the glass modifier. In this paper, the universal constants of metastable and stable phase separation are obtained from metastable systems Li_2O-SiO_2, Na_2O-SiO_2, BaO-SiO_2 and stable systems RO-SiO_2(R=Mg, Ca, Sr), R_2O_2-SiO_2(R=La, Nd, Gd, Sm, Yb), RO-B_2O_3(R=Mg, Ca, Sr, Ba).The constants are, A=-1.8305,A′=2.3551 and A=-1.7020, A′=3.5465.These constants will be applicable for all binary stable and metastable phase separation systems.