Magnetic superconducting properties of LiTi2O4 single crystal

Durmeyer, O.; Kappler, J.P.; Derory, A.; Drillon, Marc; Capponi, J.J.

doi:10.1016/0038-1098(90)90688-8

Cited by 14 publications

(3 citation statements)

References 9 publications

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“…Alternatively, spinel-type LiTi 2 O 4 crystals were grown in a molten salt bath containing TiO 2 , LiBO 2 , NaBO 2 , and NaF or TiO 2 , Li 2 CO 3 , LiF, and Na 2 B 4 O 7 13 with the assistance of electrolysis. In these processes, the cathodic reduction of Ti(IV) to Ti(III) was believed to play an important role for the formation of LiTi 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Jiang

Sun

et al. 2004

Chem. Mater.

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The rock salt-type LiTiO2 and spinel-type LiTi2O4 were synthesized with accurate control of stoichiometry by electrochemical insertion of Li+ into solid TiO2 (anatase) in molten LiCl. The behavior of Li+ insertion was investigated by cyclic voltammetry using a “TiO2 powder modified molybdenum electrode”. The results indicate two Li+ insertion reactions at two different potentials for the formation of LiTiO2 and LiTi2O4, respectively, as confirmed by ICP, XRD, and TEM analyses.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Jiang

Sun

et al. 2004

Chem. Mater.

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“…The products consist mainly of phase 2 in addition to smaller amounts of a phase of type LixTi2-x03 and one unidentified purity phase LiXTi2-,O3 are marked with a cross,( 0 ) unidentified phase.Section of the XRD pattern for the Li extracted product Li0,37Ti204+y. The peaks of the imreflection at 2 0 = 41 O…”

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confidence: 99%

Influence of the electron concentration on the superconducting properties of the spinel system Li_1‐yTi₂O₄

et al. 1993

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In the spinel system Li,-,Ti204 the Li content was reduced by oxidative extraction by means of a solution of I, as well as Br, in CH3CN or by oxygen. The extraction is associated with a transition of Ti3+ to Ti4+: the system is L i , -Y T i~! Y T i~~Y 0 4 . Consequently, with increasing y the charge carrier concentration decreases from the starting value of 0.5 electrons/Ti ion for LiTi204. The extraction proceeds in two steps. At the beginning, the Ti20, framework remains intact and the transition to superconductivity increases with decreasing charge carrier concentration to a maximal value of 13.2K. Separated by a two-phase region for medium extraction levels for higher y values, a Li depleted material of approximate composition Lio,,Ti,04 is obtained. The crystal structure of Lio.3Ti,0, can be deduced from the original spinel lattice by a partial Ti migration from 16d to 16c and 8a sites (space group Fd3m). Consequently, the Ti,04 framework of Lio,3Ti,0, is disconnected and the material is no longer superconducting.

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“…This means that as y increases from 0, Li[Li y Ti 2−y ]O 4 shows an metal-to-insulator (MIT) transition at y ≃ 0.11. 4,6 This MIT transition and the superconducting transition for the y ≃ 0 phase have been investigated by several techniques, such as magnetic susceptibility (χ) measurements on powder 4,6 and single-crystal 7,8 samples, specific heat analyses combined with electrical resistivity measurements, [9][10][11][12] NMR spectroscopy, 13 and others. [14][15][16] As a result, LiTi 2 O 4 is considered as a typical BCS type-II superconductor with moderate coupling and s-wave symmetry.…”

Section: Introductionmentioning

confidence: 99%

Magnetic anomalies and itinerant character of electrochemically Li-inserted Li[Li_1/3Ti_5/3]O₄

Mukai

Sugiyama

2015

Phys. Chem. Chem. Phys.

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Spinel oxides of Li[LiyTi2-y]O4 with 0 ≤y≤ 1/3 exhibit two desirable features for solid state chemistry and condensed matter physics. One is a reversible lithium insertion/extraction reaction, in particular for Li[Li1/3Ti5/3]O4, and the other is a superconducting transition at Tc≃ 13 K for Li[Ti2]O4. To study the change in magnetic environments of the y = 1/3 compound with excess Li(x), we measured the magnetic susceptibility (χ) for the Li1+x[Li1/3Ti5/3]O4 samples with 0 ≤x≤ 0.95, which were prepared by an electrochemical Li insertion reaction into Li[Li1/3Ti5/3]O4. Even for the x = 0 sample, two magnetic anomalies were found at T (=63 K) and T (=21 K), despite the fact that all Ti ions should be in the 4+ state with S = 0. A comparative study of TiO2 and Li2TiO3 revealed that these magnetic anomalies are not impurity-induced effects but are caused by an intrinsic nature of Li[Li1/3Ti5/3]O4, probably due to either slight compositional deviation from stoichiometry or dislocations such as a Magnéli phase. For the x > 0 samples, the χ vs. temperature curve was found to consist of a temperature-independent Pauli-paramagnetic contribution and a Curie-Weiss contribution. Detailed analyses of χ clarified the systematic variations of the effective magnetic moment of Ti ions, effective mass of electrons in the conduction band, and density of states at the Fermi level with x, indicating that the Li(+) ions at the 16d site play a significant role in localizing d electrons of Ti(3+) ions.

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Magnetic superconducting properties of LiTi2O4 single crystal

Cited by 14 publications

References 9 publications

Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Influence of the electron concentration on the superconducting properties of the spinel system Li_1‐yTi₂O₄

Magnetic anomalies and itinerant character of electrochemically Li-inserted Li[Li_1/3Ti_5/3]O₄

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Magnetic superconducting properties of LiTi2O4 single crystal

Cited by 14 publications

References 9 publications

Electrochemical Synthesis of LiTiO2 and LiTi2O4 in Molten LiCl

Electrochemical Synthesis of LiTiO2 and LiTi2O4 in Molten LiCl

Influence of the electron concentration on the superconducting properties of the spinel system Li1‐yTi2O4

Magnetic anomalies and itinerant character of electrochemically Li-inserted Li[Li1/3Ti5/3]O4

Contact Info

Product

Resources

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Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Electrochemical Synthesis of LiTiO₂ and LiTi₂O₄ in Molten LiCl

Influence of the electron concentration on the superconducting properties of the spinel system Li_1‐yTi₂O₄

Magnetic anomalies and itinerant character of electrochemically Li-inserted Li[Li_1/3Ti_5/3]O₄