化学学报 ›› 1995, Vol. 53 ›› Issue (8): 765-768. 上一篇    下一篇

研究论文

KAlF4熔液结构的推断

张启运;曹洁   

  1. 北京大学化学系
  • 发布日期:1995-08-15

A deduction on the structure of molten KAlF4

ZHANG QIYUN;CAO JIE   

  • Published:1995-08-15

研究了KAlF4与简单氟化物, 与KBF4, K3AlF6, K3GaF6, K3YF6, KBe2F5等不同类型化合物组成的赝二元系的相图。相图结果表明, 化合物组成与KAlF4愈相似者对KAlF4的熔点影响愈大, 共晶熔液中含这个化合物的浓度也愈大。简单氟化物800℃以下在KAlF4熔液中难溶, 由此推断KAlF4熔液由KAlF4分子和K^+以及AlF4^-组成。KAlF4分子相对稳定, 并占主要成分。

关键词: 熔盐, 相图, 氟化铝钾, 熔态结构

Many quasi-binary phase diagrams which comprised of KAlF4 with other fluorides or complex fluorides have made by visual-polythermal. DTA and XRD methods. Results indicated that the more composition of second components is similar to that of KAlF4, the more influence on liquid and eutectic of the system would be observed. Stable and simple fluorides are difficultly soluble in molten KAlF4 below 800℃. From mentioned, it is deduced that the structure of molten KAlF4 appears to be comprised of moleoular KAlF4 as well as ions K^+ and AlF4^-. Molecular KAlF4 is relatively stable and is the main part in the melt.

Key words: FUSED SALTS, PHASE DIAGRAM

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