Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781792 | Journal of Physics and Chemistry of Solids | 2005 | 5 Pages |
Abstract
Some lanthanide oxides form oxychlorides (LnOCl) in the chloride melts, according to the reaction, Ln2O3+2Clâ=2LnOCl+O2â. Equilibria of the reaction for Ln=La, Nd, Gd in LiCl-KCl eutectic melt were examined. Entire La2O3 and a part of Nd2O3 were converted to LaOCl and NdOCl, respectively, though Gd2O3 remained unchanged after adding 2 wt% of Ln2O3 in LiCl-KCl eutectic melt at 723 K. The equilibrium depends on the free energies of formation of the solid compounds, Ln2O3 and LnOCl, and that of oxide ion (O2â) in the melt. The standard chemical potential of the oxide ion in LiCl-KCl eutectic melt at 723 K has been calculated to 154 kJ molâ1<μ0(O2â)<168 kJ molâ1 from the equilibria using the reported thermochemical data of Ln2O3 and LnOCl.
Related Topics
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Authors
Hirokazu Hayashi, Kazuo Minato,