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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

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ISSN Печать: 1093-3611

ISSN Онлайн: 1940-4360

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Mutual Diffusion Coefficients of the Systems (Rb,Ag)Cl and (Alk,Ag)N03 with Alk = Li, Na, K, Rb, and Cs, Measured with Interferometric Methods

Том 2, Выпуск 4, 1998, pp. 521-542
DOI: 10.1615/HighTempMatProc.v2.i4.70
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Краткое описание

Mutual diffusion coefficients of the systems (Rb,Ag)Cl and (Alk,Ag)N03 with Alk = Li, Na, K, Rb, and Cs are reported. Experiments in the nitrate systems were performed with either holographic real-time interferometry or Savart interferometry under free-diffusion boundary conditions. Initial diffusion boundaries were created using a flowing junction cell or bottom layer cells. Mutual diffusion coefficients in the system (Rb,Ag)Cl were measured with digital image holography, a newly developed interferometric technique. Some experiments were performed with Savart interferometry as an internal consistency check.
In the nitrate systems diffusion data were collected in a temperature range from the melting points of the mixtures up to 603 K over the whole accessible concentration range. The D values are considered to be accurate to ±1-3%. The results have been correlated using Arrhenius-type equations. Furthermore the concentration dependence of the mutual diffusion coefficient at 573 K is discussed. The data are fitted to parabolas of the form D = a2x22+a1x2+a0, where x2 denotes the mole fraction of the silver nitrate. For all systems, except (Li,Ag)N03, parameters a2, a1 and a0 show a clear linear proportionality to the radii of the alkali ions. Trace diffusion coefficients are extrapolated and discussed.
Mutual diffusion coefficients in the system (Rb,Ag)Cl with xAgCl = 0.61 were measured in a temperature range between 573 K and 748 K. The results show an Arrhenius behaviour with D = (1.37 ± 0.10) m2 s−1exp(-(20.7 ± 0.4) kJ mol−1/(RT)).

ЦИТИРОВАНО В
  1. Richter J., Leuchter A., Großer N., Digital image holography for diffusion measurements in molten salts and ionic liquids - method and first results, Journal of Molecular Liquids, 103-104, 2003. Crossref

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