Stabilization of Superionic-Conducting High-Temperature Phase of Li(Cb9h10) via Solid Solution Formation with Li2(B12H12)

We report the stabilization of the high-temperature (high-T) phase of lithium carba-closo-decaborate, Li(CB9H10), via the formation of solid solutions in a Li(CB9H10)-Li2(B12H12) quasi-binary system. Li(CB9H10)-based solid solutions in which [CB9H10]− is replaced by [B12H12]2− were obtained at compositions with low x values in the (1−x)Li(CB9H10)−xLi2(B12H12) system. An increase in the extent of [B12H12]2− substitution promoted stabilization of the high-T phase of Li(CB9H10), resulting in an increase in the lithium-ion conductivity. Superionic conductivities of over 10−3 S cm−1 were achieved for the compounds with 0.2 ≤ x ≤ 0.4. In addition, a comparison of the Li(CB9H10)−Li2(B12H12) system and the Li(CB9H10)−Li(CB11H12) system suggests that the valence of the complex anions plays an important role in the ionic conduction. In battery tests, an all-solid-state Li–TiS2 cell employing 0.6Li(CB9H10)−0.4Li2(B12H12) (x = 0.4) as a solid electrolyte presented reversible battery reactions during repeated discharge–charge cycles. The current study offers an insight into strategies to develop complex hydride solid electrolytes.

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HREM studies of modulated structures of the monoclinic (B) phase in CaO-Dy2O3 solid solutions

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174229 ◽

1990 ◽

Vol 48 (4) ◽

pp. 218-219

Author(s):

Y. J. Kim ◽

W. M. Kriven

Keyword(s):

High Temperature ◽

Solid Solutions ◽

Room Temperature ◽

Rapid Quenching ◽

High Temperature Phase ◽

Temperature Phase ◽

Volume Increase ◽

Normal Lattice ◽

Modulated Structures ◽

Moderate Resolution

Dysprosia (Dy203) undergoes a monoclinic (B) to cubic (C) transformation on cooling through 1860°C, which is accompanied by an 8% volume increase and shattering. Minor additions of CaO combined with rapid quenching, however, are able to stabilize the high temperature phase at room temperature, which is incommensurately modulated. TEM studies revealed the existence of three different modulations: q1 (001-type; λ ≈ 9.0 Å), q2 (200-type; λ ≈ 7.5 Å), and q3 (λ ≈ 40 Å). HREM studies on modulated specimens have been conducted to search for the origin of these modulated microstructures.Fig. 1 shows characteristic modulations in the [010]B orientation. Whereas both q1 and q2 look like normal lattice fringes in moderate resolution TEM images, HREM images indicate that they are actually not strictly linear but somewhat displaced. This discontinuity is more obvious in the HREM images displaying separate q1 and q2 modulations such as q1 in the [110] orientation (Fig. 2) and q2 in the [011] orientation (Fig. 3).

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An analysis of the high-temperature phase structure of multiferroic solid solutions of the PFW-PT

St Petersburg State Polytechnical University Journal Physics and Mathematics ◽

10.5862/jpm.248.3 ◽

2016 ◽

Vol 248 (3) ◽

pp. 23-32

Author(s):

A.A. Naberezhnov ◽

I.A. Dolgakov ◽

M. Tovar ◽

O.A. Alekseeva ◽

S.B. Vakhrushev

Keyword(s):

High Temperature ◽

Solid Solutions ◽

Phase Structure ◽

High Temperature Phase ◽

Temperature Phase

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On the High Ionic Conductivity of Solid Solutions of Lithium Sulphate in Hexagonal Sodium Sulphate Na2SÒ4(I)

Zeitschrift für Naturforschung A ◽

10.1515/zna-1995-4-502 ◽

1995 ◽

Vol 50 (4-5) ◽

pp. 327-328 ◽

Cited By ~ 2

Author(s):

Arnold Lundén ◽

Leif Nilsson

Keyword(s):

High Temperature ◽

Ionic Conductivity ◽

Solid Solutions ◽

High Temperature Phase ◽

Sodium Sulphate ◽

High Ionic Conductivity ◽

Temperature Phase ◽

Lithium Sulphate

Abstract Solid solutions of Li2SO4 in the high-temperature phase Na2SO4 (I) have a much higher conductivity than expected. Diffusion and electromigration experiments show that both Li+ and Na+ ions are very mobile. It is concluded that the Li+ ions go into interstitial positions of the type (1/2,0,0), while vacancies are created in the Na+ lattice

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An analysis of the high-temperature phase structure of multiferroic solid solutions of the PFW–PT

St Petersburg Polytechnical University Journal Physics and Mathematics ◽

10.1016/j.spjpm.2016.08.005 ◽

2016 ◽

Vol 2 (3) ◽

pp. 181-187

Author(s):

Aleksandr A. Naberezhnov ◽

Ivan A. Dolgakov ◽

Mikhael Tovar ◽

Olga A. Alekseeva ◽

Sergey B. Vakhrushev

Keyword(s):

High Temperature ◽

Solid Solutions ◽

Phase Structure ◽

High Temperature Phase ◽

Temperature Phase

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Synthesis and Characterization of Lithium Ion Conductors, Li3InBr6 and their Substituted Compounds

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.242-244.17 ◽

2005 ◽

Vol 242-244 ◽

pp. 17-26

Author(s):

Yasumasa Tomita ◽

Hideyoshi Matsushita ◽

Yasuhisa Maeda ◽

Kenkichiro Kobayashi ◽

Koji Yamada

Keyword(s):

Phase Transition ◽

High Temperature ◽

Lithium Ion ◽

Substitution Effect ◽

High Temperature Phase ◽

Temperature Phase ◽

X Ray Diffraction ◽

X Ray ◽

Li Ion ◽

Lithium Ion Conductors

Li3-2xMxInBr6 (M=Mg, Ca, Sr and Ba) and Li3In1-xMxBr6 was synthesized, and thier substitution effect was investigated by means of 7Li and 115In NMR, X-ray diffraction and AC conductivity measurements. Phase transition was observed at 314 K in Li3InBr6 and fast Li+ diffusion was observed in the high temperature phase. Li3InBr6 has high Li+ ion conductivity and showed a little difference in X-ray diffraction patterns between the low-temperature phase and the high-temperature phase. These indicate that the sub-lattice for Li+ ions changed largely at the phase transition point and this change makes Li+ diffusion easily. In the high temperature phase of substituted compounds, the conductivity decreased with the amounts of substitution. and defects produced by the substitution with divalent cation did not contribute to the Li+ ion conduction. In the LT phase for Mg compound, the ionic conductivity increases up to x = 0.4 due to the introduction of the extrinsic vacancies.

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