K_2B_4O_7-Na_2B_4O_7-Li_2B_4O_7-H_2O四元体系273K介稳相平衡  

Metastable Equilibrium Solubilities of Solutions in the Quaternary System of K_2B_4O_7-Na_2B_4O_7-Li_2B_4O_7-H_2O at 273 K

作　　者：桑世华[1] 殷辉安[1] 倪师军[2] 张成江[2] 

机构地区：[1]成都理工大学材料与化学化工学院,成都610059 [2]成都理工大学地球化学系,成都610059

出　　处：《物理化学学报》2007年第8期1285-1287,共3页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(40303010);中国博士后科学基金(20060390324)联合资助项目

摘　　要：采用等温蒸发平衡法研究了四元体系K2B4O7-Na2B4O7-Li2B4O7-H2O在273K时的介稳相平衡及平衡液相的密度.研究发现该四元体系为简单共饱和型,无复盐及固溶体形成,根据溶解度数据绘制了相图,相图中有一个共饱点E,三条单变度曲线E3E,E2E,E1E;三个平衡固相分别为K2B4O7·4H2O、Na2B4O7·10H2O和LiBO2·8H2O.并简要讨论了实验结果.Metastable equilibrium solubilities and densities of the quaternary system of K2B4O7-Na2B4O7-Li2B4O7-H2O at 273 K were studied by isothermal evaporation method. Based on the solubility data, the metastable equilibrium phase diagram of the system was plotted, which consists of one invariant point E; three univariant curves EaE, E2E, and EaE, three crystallization fields K2B4O7-Na2B4O7-Li2B4O7-H2O, and LiBO2- 8H2O. Potassium borate （K2B4O7） had the largest solubility in the system.

关 键 词：水盐体系 介稳相平衡 硼酸盐 

分 类 号：O642.42[理学—物理化学]