Lithium-isotope effect on ionic conductivity of (La0.52Li0.27)0.95Sr0.05TiO2.92

2003 ◽  
Vol 161 (1-2) ◽  
pp. 55-59 ◽  
Author(s):  
S Shioya
Keyword(s):  
Ionic Conductivity ◽  
Isotope Effect ◽  
Lithium Isotope

Electrochemical Isotope Effect and Lithium Isotope Separation

2009 ◽  
Vol 131 (29) ◽  
pp. 9904-9905 ◽  
Author(s):  
Jay R. Black ◽  
Grant Umeda ◽  
Bruce Dunn ◽  
William F. McDonough ◽  
Abby Kavner
Keyword(s):  
Isotope Effect ◽  
Isotope Separation ◽  
Lithium Isotope

Lithium Isotope Effect Accompanying Electrochemical Intercalation of Lithium into Graphite

2003 ◽  
Vol 58 (5-6) ◽  
pp. 306-312 ◽  
Author(s):  
Satoshi Yanase ◽  
Wakana Hayama ◽  
Takao Oi
Keyword(s):  
Isotope Effect ◽  
Separation Factor ◽  
Early Stage ◽  
Isotope Separation ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
Lithium Isotope ◽  
Mixed Solution ◽  
Electrochemical Intercalation ◽  
Graphite Intercalation

Lithium has been electrochemically intercalated from a 1:2 (v/v) mixed solution of ethylene carbonate (EC) and methylethyl carbonate (MEC) containing 1 M LiClO4 into graphite, and the lithium isotope fractionation accompanying the intercalation was observed. The lighter isotope was preferentially fractionated into graphite. The single-stage lithium isotope separation factor ranged from 1.007 to 1.025 at 25 °C and depended little on the mole ratio of lithium to carbon of the lithium-graphite intercalation compounds (Li-GIC) formed. The separation factor inceased with the relative content of lithium. This dependence seems consistent with the existence of an equilibrium isotope effect between the solvated lithium ion in the EC/MEC electrolyte solution and the lithium in graphite, and with the formation of a solid electrolyte interfaces on graphite at the early stage of intercalation.

Lithium Isotope Effect Accompanying Electrochemical Insertion of Lithium into Liquid Gallium

2010 ◽  
Vol 65 (5) ◽  
pp. 461-467 ◽  
Author(s):  
Keita Zenzai ◽  
Ayaka Yasui ◽  
Satoshi Yanase ◽  
Takao Oi
Keyword(s):  
Isotope Effect ◽  
Isotope Effects ◽  
Isotope Separation ◽  
Ethylene Carbonate ◽  
Quantitative Agreement ◽  
Liquid Gallium ◽  
Molecular Orbital Calculations ◽  
Lithium Isotope ◽  
Mixed Solution ◽  
Separation Factors

Lithium was electrochemically inserted from a 1 : 2 (v/v) mixed solution of ethylene carbonate (EC) and methylethyl carbonate (MEC) containing 1M LiClO4 into liquid gallium to observe lithium isotope effects accompanying the insertion. It was observed that the lighter isotope 6Li was preferentially fractionated into liquid gallium with the single-stage lithium isotope separation factors S, ranging from 1.005 to 1.031 at 50 °C and 1.003 to 1.024 at 25 °C. The lithium isotope effects estimated 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

The Isotope Effect of Electromigration in Some Solid Alkali Halides

1971 ◽  
Vol 26 (2) ◽  
pp. 300-307 ◽  
Author(s):  
Takeshi Morimoto ◽  
Isao Okada ◽  
Nobufusa Saito
Keyword(s):  
Activation Energy ◽  
Ionic Conductivity ◽  
Single Crystal ◽  
Potassium Chloride ◽  
Isotope Effect ◽  
Lithium Fluoride ◽  
Alkali Halides ◽  
Mass Effect ◽  
Relative Difference ◽  
Solid Alkali Halides

The isotope effect of electromigration in some solid alkali halides was determined in their intrinsic ionic conductivity region. The external cationic mass effect (i. e., relative difference in cationic mobility/relative difference in mass) of lithium fluoride, chloride, bromide and iodide and potassium chloride was -0.243, -0.207, -0.195, -0.190 and -0.254, respectively, at 750, 540, 470, 370 and 600 °C, respectively. No difference of the mass effect was found between polycrystalline and single crystal potassium chloride. When the available data for the mass effect of the solid salts are plotted against the activation energy for electric conductance, there is a tendency for the mass effect to increase as the activation energy increases.

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