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Potentiometric study of the interaction of Sm3+ and O2− ions: thermodynamic properties of samarium compounds in molten NaCl–2CsCl eutectic.

Authors :
Zhang, Henan
Liu, Qi
Novoselova, Alena
Smolenski, Valeri
Jiang, Kewei
Yan, Yongde
Zhang, Milin
Wang, Jun
Source :
New Journal of Chemistry; 7/21/2024, Vol. 48 Issue 27, p12146-12152, 7p
Publication Year :
2024

Abstract

The reactions of oxygen and samarium ions in molten NaCl–2CsCl eutectic in the temperature range of 823–913 K have been investigated by potentiometric titration in an inert gas atmosphere. The activity of oxygen ions in the studied melts was monitored using a standard YZME (indicator) electrode based on Y<subscript>2</subscript>O<subscript>3</subscript>-stabilized ZrO<subscript>2</subscript> with a solid–electrolyte membrane. The titration of Sm<superscript>3+</superscript> by O<superscript>2−</superscript> ions demonstrated the formation of insoluble SmOCl compounds in the investigated region. The mechanism of formation of SmOCl and Sm<subscript>2</subscript>O<subscript>3</subscript> was established by the analysis of potentiometric titration curves. Subsequently, the solubility of SmOCl and Sm<subscript>2</subscript>O<subscript>3</subscript> in the melt was calculated using the material balance equation and solubility constant equation. Finally, the basic thermodynamic properties of SmOCl and Sm<subscript>2</subscript>O<subscript>3</subscript> in molten NaCl–2CsCl eutectic were calculated, and the properties of samarium in the melt were summarized using the Pourbaix-type (E-pO<superscript>2−</superscript>) diagram to determine the kinds of stabilized samarium compounds. Furthermore, the optimal chlorination conditions can be obtained from the E-pO<superscript>2−</superscript> diagram of Sm. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
11440546
Volume :
48
Issue :
27
Database :
Complementary Index
Journal :
New Journal of Chemistry
Publication Type :
Academic Journal
Accession number :
178314004
Full Text :
https://doi.org/10.1039/d4nj00537f