Thermodynamic Model for the Solubility of NdF3(cr) in the Na+–NH 4 + –Nd3+–F−–H2O System at 25 °C

Autor: Dhanpat Rai, Akira Kitamura, Mikazu Yui, Andrew R. Felmy, Hideki Yoshikawa
Rok vydání: 2013
Předmět:
Zdroj: Journal of Solution Chemistry. 42:1500-1517
ISSN: 1572-8927
0095-9782
DOI: 10.1007/s10953-013-0049-z
Popis: The major objective of this study, based on critical review and experimental studies, was to develop a reliable thermodynamic model for the Nd–F system at 25 °C. The SIT model was used to convert concentration constants reported in the literature to constants at zero ionic strengths for cross comparison and selection of reliable values. The critically evaluated thermodynamic constants for the formation of NdF2+ and NdF 2 + were then used to interpret the extensive NdF3(cr) solubility data in NaF and NH4F solutions, ranging in concentrations from extremely low values to as high as 1.0 mol·kg−1, equilibrated for different periods ranging up to as long as 72 days. These efforts have resulted in $$ \log_{10} \beta_{n}^{0} $$ for the reaction [Nd3+ + nF− ⇌ NdF 3− ] of (3.81 ± 0.10), (5.89 ± 0.77), and
Databáze: OpenAIRE
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