Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Shevelin P. Yu., Molchanova N. G., Yolshin A. N., Batalov N. N.
Заглавие : Electron transfer in an electron-ion molten mixture of CuCl-CuCl2-MeCl (Me = Li, Na, K, Cs)
Место публикации : Electrochimica Acta. - 2003. - V. 48, N 10. - С. 1385-1394. - ISSN 0013-4686. - ISSN 0013-4686
Примечания : Bibliogr.: 46 ref.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Electron and ion transfer numbers, electroconductivity, density, and concentrations of Cu+ and Cu2+ in molten salt mixtures of CuCl-CuCl2-MeCl (Me - Li, Na, K, Cs) were measured at a partial pressure of chlorine over the melt equal to the atmospheric pressure in the temperature interval from 800 to 1000 K. Partial values of ion and electron transfers and the molar volume of the with tc equal to 0.9. When chlorides of alkali metals were added to the CuCl-CuCl2 melt, the electron component of electroconductivity was preserved up to 90, 65, 60, and 50 mol.% LiCl, NaCl, KCl, and CsCl, respectively. A mechanism of the electron transfer in the test melts was proposed2?Electron and ion transfer numbers, electroconductivity, density, and concentrations of Cu ? and Cu
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Вид документа : Статья из журнала
Шифр издания : 54/E 27
Автор(ы) : Stepanov V. P., Babushkina L. M., Dokashenko S. I., Peshkin D. S.
Заглавие : Effect of KCl and CsCl on the Electrical Conductivity of Molten LiF–KBr at the Critical Composition
Место публикации : Journal of Chemical & Engineering Data. - 2012. - Vol. 57, № 8. - С. 2309-2312.: граф. - ISSN 0021-9568. - ISSN 0021-9568
Примечания : Библиогр.: с. 2312 (12 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электропроводность--lif–kbr--cscl
Аннотация: The electrical conductivity was measured from the melting point to 1280 K for molten 0.7 LiF–0.3 KBr (its composition corresponds to the top of the miscibility gap) containing (2.3, 4.4, 6.5, 8.8, and 11.2) mol % KCl or (1.2, 2.5, 5.5, and 10.2) mol % CsCl to establish the influence of this solute on the stability of the two-phase system. These results indicate that the temperature dependences of the conductivity along the saturation lines for all of the mixtures studied herein are similar to one another. Hence, this demonstrates that small additions of KCl and CsCl to the dissolving melt of LiF-KBr do not exert a substantial influence on its type of criticality. In the vicinity of the critical point, the temperature dependence on conductivity differences for melts is investigated and is described by the equation Δκ ≈ (Tc – T)k, where k is the critical exponent (k = 0.98). The critical temperature changes as a function of the mixture composition and depends on the ion size of the salt added. The critical temperature increases continuously with the addition of CsCl to molten LiF-KBr, whereas it decreases as the fraction as KCl is added. This circumstance must occur during the organization process, as salts accumulate in the dissolving molten mixture, and they prevent the confluence of the phases at a given operating temperature. To interpret the experimental results, the charged hard sphere model for ionic melts in the Debye–Hückel approximation was used with an account of the excluded volume.
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Вид документа :
Шифр издания : 54/S 83
Автор(ы) : Stepanov V. P., Minchenko V. I.
Заглавие : Sound Velocities for Dissolving AgI + LiCl Melts
Место публикации : Journal of Chemical & Engineering Data. - 2014. - Vol. 59, № 11. - С. 3888-3893
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ультразвук--скорость звука--фазовый переход--температурные зависимости
Аннотация: The ultrasonic velocities of a molten stratified mixture at a molar ratio of 0.3AgI and 0.7LiCl (the composition corresponding to the top of the miscibility gap) were measured along the saturation line over a wide temperature range using the pulse method to establish the characteristics of mixing salts comprising different chemical bonds. It is shown that the coefficients of the temperature dependences for the sound velocities in the coexisting phases have opposite signs as a result of the superposition of the temperature and concentration factors. It is found that the difference, Δu, between the magnitudes of the sound velocities for the coexisting phases decreases with increasing temperature and becomes zero at 1250 K. This temperature corresponds to the critical phase transition point, Tc. The temperature dependence of the sound velocity difference, Δu, for the system studied is described by the equation Δu ≈ (Tc – T)β, where β = 0.900, which is close to the value 0.896 obtained for the previously investigated AgI+NaCl melt but is less than the value found for alkali halide melts (β = 1.02), in which long-range Coulomb forces between ions prevail. The results are discussed in terms of the peculiarity of the chemical bond in silver iodide.
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