SELF-DIFFUSION OF Ag$sup +$ AND Na$sup +$ IN MOLTEN Ca(NO$sub 3$)$sub 2$-- KNO . Page: 5 of 34
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The glass-forming ionic liquid formed by mixing calcium nitrate and
potassium nitrate in equal proportions by weight has been the subject of a
number of recent detailed mass transport studies (1-5). So far these have
been concerned with processes such an electrical conductance (1,,4 and
viscous flow (2,5) in Aich the system response is measured to a perturbation
from equiLibrium that affects aLl ionic species present. In seLf-diffusion
measurements the equiLibrin state of the system is perturbed only with
respect to the distribution of a single ionic species, thus in principle
some extra detail on the transport mechanism may be obtained. The present
paper reports results of self-diffusion measurements ob Ag+ and Na in the
melt of composition 38.1 mole % Ca(N03)2 - 61,9 moLe % K0 which was chosen
because, according to Dietzel and Poegel (6),. it has the slowest crystalli-
zation rate, hence permits longer studies in the supercooled condition.
The measurement of .diffusion coefficients in supercooled melts by
conventional tracer methods presents severe probLems. Of the avaiLabLe
tracer methods the diffusion-out-of--capiLLary method is considered the most
reliable (7,8). However, even in the normal fluid melts where diffusion
coefficients ire of the order of 10-5 cm sec-, capillary measurements
require diffusion periods greater than six bours to achieve good accuracy.
This diffusion time increases greatly when the saller diffusion coefficients
encountered in viscous melts are to be measured.
When the viscous melt is in the supercooled condition the experimen-
talist is faced with the additional problem that crystallization of the melt
will probably commence before a suitable diffusion period has elapsed (9).
Thus a method of measuring diffusion coefficients which can be carried out
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Welch, B. J. & Angell, C. A. SELF-DIFFUSION OF Ag$sup +$ AND Na$sup +$ IN MOLTEN Ca(NO$sub 3$)$sub 2$-- KNO ., report, January 1, 1970; Lafayette, Indiana. (https://digital.library.unt.edu/ark:/67531/metadc1029789/m1/5/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.