Viscosity and phase transitions were studied in the (KF-KCl)_eut.-(10 mol. %)K₂SiF₆ system. Synchronous thermal analysis (STA) was used to study the phase transformations in the system in the temperature range of 298–1113 K. The (KF-KCl)_eut.-(10 mol. %)K₂SiF₆ melt was found to be homogeneous at 903–993 K. The viscosity of the system under study was investigated by the rotational viscometer FRS 1600. The results may be described by linear function in coordinates ln(η) – 10 000/T at 898–984 K when viscosity changes from 2.8 to 2.1 mPa s. The melt's nonhomogeneity at 984–1055 K is manifested by the change of the temperature dependence slope. The correlation of viscosity and STA data allows determining the decomposition mechanism of K₂SiF₆ in the melt under study. The decomposition results in the formation of KF and SiF₄. The viscosity of the investigated system was measured during the crystallization process at 876–898 K. The melt at the temperatures below 898 K was found to be in the form of suspension, which is illustrated by the deviation of the linear dependence in ln(η) – 10 000/T coordinates. At 876–898 K, the viscosity rises from 2.8 mPa s to 85.1 Pa s as temperature decreases.

中文翻译：

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用于电解生产硅的KF-KCl-K2SiF6电解质的流变学和热学性质

在（KF-KCl）_eut中研究了粘度和相变_。-（10摩尔％）K ₂ SiF ₆体系。同步热分析（STA）用于研究系统在298-1113 K温度范围内的相变。（KF-KCl）_被测物。-（10 mol。％）K ₂ SiF ₆熔体在903-993 K时是均匀的。正在研究的系统的粘度通过旋转粘度计FRS 1600进行了研究。结果可以通过坐标为ln的线性函数来描述（η）–当粘度从2.8变为2.1 mPa s时，在898–984 K时为10000 / T。熔体在984-1055 K处的非均质性是由温度依赖性斜率的变化所体现的。粘度和STA数据的相关性可以确定所研究熔体中K ₂ SiF ₆的分解机理。分解导致形成KF和SiF ₄。在876–898 K的结晶过程中测量了所研究系统的粘度。发现在898 K以下的温度下，熔体为悬浮液形式，这通过ln（η）的线性相关性偏差来说明。）– 10000个/ T坐标。在876–898 K时，随着温度降低，粘度从2.8 mPa s上升到85.1 Pa s。