Stable Phase Equilibrium and Phase Diagram of the Quinary System Li+, K+, Rb+, Mg2+//Borate-H2O at T = 348.15 K

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• 作者：Xudong Yu ; Ying Zeng ; Shanshan Guo ; Yujuan Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1246-1253
• 全文大小：360K
• ISSN：1520-5134

文摘

The stable phase equilibrium of mixed aqueous electrolyte system Li⁺, K⁺, Rb⁺, Mg²⁺//borate-H₂O has been studied using the isothermal dissolution method at T = 348.15 K. The space diagram, the planar projection diagram (saturated with Li₂B₄O₇), water content diagram, and diagrams of the physicochemical properties (densities and refractive indices) have been constructed based on the Jänecke method. The crystallographic form of the solid phase at the quinary system invariant point was identified by the X-ray diffraction method. Results show that the quinary system belongs to a simple type without solid solution or double salt formed. The crystallographic form of borates formed in this work are Li₂B₄O₇·3H₂O, K₂B₄O₅(OH)₄·2H₂O, RbB₅O₆(OH)₄·2H₂O, and MgB₄O₅(OH)₄·7H₂O. Under the condition of Li₂B₄O₇ saturated, the crystallization area of salts decrease in the order of RbB₅O₆(OH)₄·2H₂O > MgB₄O₅(OH)₄·7H₂O > K₂B₄O₅(OH)₄·2H₂O.