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Barium isotopes were fractionated in a liquid-liquid extraction system using a crown ether of dicyclohexano-18crown-6. The temperature dependence of isotope enrichment factors was investigated at 273.2 to 323.2 K. Within the experimental error, the isotope effects appeared to be ruled by the conventional mass-dependent theory. The maximum isotope effect was observed at 323.2 K, whose isotope enrichment factor for unit mass difference was ε u =−0.00044±0.00013. Relation between ε u and 1/T showed a characteristic curve, but was deviated from a temperature-dependent theory of ε=a/T +b/T 2. The change in the coefficient a in the present system was discussed by considering the obtained results.

Barium isotopes were fractionated in a liquid-liquid extraction system using a crown ether of dicyclohexano-18-crown-6. The temperature dependence of isotope enrichment factors was investigated at 273.2 to 323.2 K. Within the experimental error, the isotope effects appeared to be ruled by the conventional mass-dependent theory. The maximum isotope effect was observed at 323.2 K, whose isotope enrichment factor for unit mass difference was ε u =−0.00044±0.00013. Relation between ε u and 1/T showed a characteristic curve, but was deviated from a temperature-dependent theory of ε=a/T +b/T 2 . The change in the coefficient a in the present system was discussed by considering the obtained results.

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