ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

 Measurement of viscosity of fused salts. I. Method of measurement. Viscosity of Li₃AlF₆ and Na₃AlF₆

I. Votava and K. Matiašovský

Institute of Inorganic Chemistry, Slovak Academy of Sciences, 80934 Bratislava

Abstract:  The theory of the damped oscillation of an oscillating body is discussed with regard to the determination of the viscosity of fused salts. The absolute and relative methods of viscosity measurements using the torsion pendulum method were analyzed. The possibility of application of a simple dependence, which makes possible to calibrate the apparatus using a single series of liquids in the relative viscosity measurements, was verified. The results were compared with those obtained by the absolute method. The oscillating torque viscosimeter for the measurement in the high-corrosive low-viscosity melts up to 1200°C is described. The reproducibility of the measurement was ± 1.5%. In order to determine the suitability of the experimental arrangement, the viscosities of the reference substances, both of the aqueous solutions and of the fused salts, were determined. The results confirmed the suitability of the proposed scheme in the estimated interval of viscosities. Using the tested apparatus, the viscosities of molten Li₃AlF₆ and Na₃AlF₆ in the temperature range 900-1100°C and 1040-1170°C, respectively, were measured.

Full paper in Portable Document Format: 272a172.pdf

Chemical Papers 27 (2) 172–182 (1973)