Adiabatic compressibility of an immiscible molten NaCl–AgI salt mixture
- Authors: Stepanov V.P.1,2, Tkachev N.K.1, Kulik N.P.1, Peshkina K.G.1
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Affiliations:
- Institute of High-Temperature Electrochemistry, Ural Branch
- Ural Federal University
- Issue: Vol 2016, No 8 (2016)
- Pages: 698-704
- Section: Article
- URL: https://journals.rcsi.science/0036-0295/article/view/170727
- DOI: https://doi.org/10.1134/S003602951602018X
- ID: 170727
Cite item
Abstract
Adiabatic compressibility β of an immiscible 0.5NaCl + 0.5AgI liquid mixture in the immiscibility range is studied experimentally and theoretically using the model of charged hard spheres. The compressibility is calculated by the relationship β = 1/u2ρ studied using sound velocity u measured by a pulse method and density ρ determined by hydrostatic weighing. It is shown that the compressibility of the upper phase decreases and that of the lower phase increases when the temperature increases because of the superposition of the effects of the thermal motion of ions and the phase compositions. The temperature dependence of the difference between the compressibilities of the equilibrium phases is described using the empirical equation Δβ = (Tc–T)0.442, which is close to the mean-field theory description. The results of the model calculations adequately reproduce the experimentally observed temperature dependence of the compressibility of the coexisting phases. However, the theoretically predicted critical exponent (1/2) differs from the experimentally determined exponent by 13%. These results are discussed in terms of the nature of chemical bond in silver iodide.
About the authors
V. P. Stepanov
Institute of High-Temperature Electrochemistry, Ural Branch; Ural Federal University
Author for correspondence.
Email: v.stepanov@ihte.uran.ru
Russian Federation, ul. S. Kovalevskoi 22, Yekaterinburg, 620219; ul. Mira 19, Yekaterinburg, 620002
N. K. Tkachev
Institute of High-Temperature Electrochemistry, Ural Branch
Email: v.stepanov@ihte.uran.ru
Russian Federation, ul. S. Kovalevskoi 22, Yekaterinburg, 620219
N. P. Kulik
Institute of High-Temperature Electrochemistry, Ural Branch
Email: v.stepanov@ihte.uran.ru
Russian Federation, ul. S. Kovalevskoi 22, Yekaterinburg, 620219
K. G. Peshkina
Institute of High-Temperature Electrochemistry, Ural Branch
Email: v.stepanov@ihte.uran.ru
Russian Federation, ul. S. Kovalevskoi 22, Yekaterinburg, 620219