Internal Cation Mobilities in the Molten Binary Systems  (  Y  , La ) Cl3 and  (  Y  , Dy ) Cl3

Abstract

Internal cation mobility ratios in the molten systems (Y, La)C13 and (Y, Dy)C13 have been measured at 1073 K by the Klemm method and the electrical conductivities of these systems have been measured by conventional ac techniques. From these studies and the data available on the densities of the pure melts, the internal mobilities, u, have been calculated; uLa is greater than zt, while the ionic radius of La3 is greater than that of Y3'. On the other hand, u is slightly greater than u07, where the ionic radii are much the same and the mass of Y3' is much less than that of Dy3'. Internal mobilities of all the cations in both (Y, La)C13 and (Y, Dy)C13 systems decrease with increasing molar volume of the mixtures. The dominant electrically conducting cationic species are conjectured to be the nonassociated rare-earth cations.

Internal Cation Mobilities in Molten (K, Dy1/3)Cl

“…This demonstrates that in this range the electricallyconducting species of Dy does not change much, and is therefore assumed to be mainly Dy 3 + , although [DyCl 6 ] 3_ may be expected to exist partially. [20]. With increasing equivalent volume, that is with increasing y K , the number of more free CP ions will increase.…”

High Enrichment of 6Li in Molten Nitrates by the Klemm Method

“…in the case of (Li, Na)NO 3 , because the larger cation is more mobile than the smaller one under all accessible conditions [5]. In charge symmetrical multivalent cation melts with a common anion such as (Ca, Ba) 1/2 Cl [27] and (Y, La) 1/3 Cl [28], the larger cation is more mobile. On the other hand, in the case of (Li, NH 4 )NO 3 and (Na, NH 4 )NO 3 the definition for the Chemla effect is more difficult since the isotherms cannot cover all the concentration range (0 ≤ x NH 4 ≤ 1) owing to the thermal decomposition of NH 4 NO 3 .…”