SELF-DIFFUSION OF Ag$sup +$ AND Na$sup +$ IN MOLTEN Ca(NO$sub 3$)$sub 2$-- KNO . Page: 8 of 34
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Malinckrodt A.R. grade KNOa and ca(N)a 4 Ho0 were used to prepare the
solvent eutectic mixture. The silver nitrate used for the chronopotentiometric
study was a refined A.R. grade. PLatinum wire (0.5 mm diam.) and platinum foil
(O.a rm thick) were suppLied by Engelhard Industries while the silver wire.
(0.5 mm diam.) and silver foil (0.2 mp thick) were chemically pure.
A. CHONOPOTENTIOMETRIC DIFFUSION STUDIES
The melt was contained in a round bottomed tubular pyrex crucible 47 mm
O.D. x 90 mm deep. Two holes positioned dienetrically opposite each other
and near the top of this crucible enabled it to be readily removed from the
outer glass enveLope that supported and positioned the crucible. The outer
envelope was a pyrex tube, & mm O.D. x 7D mm long, sealed at one end.
At the top was attached a Fischer and Porter 50 mm "solv-seal" joint. A
side ar, positioned 40 mm from the top of the glass envelope and terminating
in a S.J. 13/5 joint, served as a gas outLet. The electrodes were positioned,
axA the apparatus was sealed, with a machined teflon top that was fitted-with
an O-ring. The teflon top had five holes machined to accept standard taper
ground glass joints and the electrodes were positioned through these holes.
The working or indicator electrode vas similar in design to that used by
!'oynihan and Angell (18) although in this instance it was modified so that it
could be readily removed from the melt without breaking the seal from the
atmosphere. This was accomplished by use of a ground sliding joint. Both
silver and platinum foil electrodes were used and in each instance they were
welded to matching wire that had been sealed into the insulating glass. The
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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/m1/8/: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.