Electrical Conductivity of Molten LaCl₃-NaCl, LaCl₃-KCl, and LaCl₃-CaCl₂

Abstract

The electrical conductivities (x's) of molten LaCl3-NaCl, LaCl3-KCl, and LaCl3-CaCl2 were measured at 893-1168 K, by a conventional ac technique and fitted by quadratic functions of temperature. They increase with increasing temperature and decrease with increasing mole fraction of LaCl3. The equivalent conductivities (A's) follow a linear relationship of In A vs. 1/T The A's of LaCl3-NaCl and LaCl3-KCl decrease drastically with increasing LaCl3 concentration. A of molten LaCl3 is smaller than that of molten CaCl2, in which the octahedral complex anion CaClg" is known to exist. It seems reasonable to assume that complex ions or cluster species such as LaCl^-and La2Cli!~ exist in molten LaCl3 and its mixture melts. Similar results, reported in a previous paper, were obtained for PrCl3-NaCl, PrCl3-KCl, and PrCl3-CaCl2.

Structure of molten lanthanum and cerium tri-halides by the method of isomorphic substitution in neutron diffraction

“…The room temperature crystal structure type (Wells 1984), melting point T m (Dworkin and Bredig 1971), entropy change on melting S m (Dworkin and Bredig 1971), ionic conductivity at the melting point κ m and volume change V /V m (see text) for LaX 3 and CeX 3 . a Janz et al (1975), Fukushima et al (1991). b Gaune et al (1996).…”