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Lithium Isotope Effect Accompanying Electrochemical Insertion of Lithium into Liquid Gallium

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Lithium Isotope Effect Accompanying Electrochemical Insertion of Lithium into Liquid Gallium

Keita Zenzaia, Ayaka Yasuia, Satoshi Yanaseb, and Takao Oia

aFaculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo 102-8554, Japan

bSamsung Yokohama Research Institute, 2-7Sugasawa-cho, Turumi-Ku, Yokohama 230-0027, Japan

Reprint requests to T. O.; Fax: +81-45-510-3368, E-mail: syan@ea.mbn.or.jp Z. Naturforsch.65a,461 – 467(2010); received September 7, 2009

Lithium was electrochemically inserted from a 1 : 2 (v/v) mixed solution of ethylene carbonate (EC) and methylethyl carbonate (MEC) containing 1 M LiClO4into liquid gallium to observe lithium isotope effects accompanying the insertion. It was observed that the lighter isotope6Li was prefer- entially fractionated into liquid gallium with the single-stage lithium isotope separation factorsS, ranging from 1.005 to 1.031 at 50C and 1.003 to 1.024 at 25C. The lithium isotope effects esti- mated by molecular orbital calculations at the B3LYP/6-311G(d) level of theory agreed qualitatively with those of the experiments, but the quantitative agreement of the two was not satisfactory.

Key words:Lithium Isotope Effects; Electrochemical Insertion; Gallium; Molecular Orbital Calculation; Reduced Partition Function Ratio.

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