Ion mobility, conductivity, structure, and phase transitions in K0.7M0.3SbF4 compounds with M=Rb, NH4

Kavun, V. Ya.; Герасименко, А. В.; Уваров, Н. Ф.; Polyantsev, M. M.; Земнухова, Л. А.

doi:10.1016/j.jssc.2016.05.033

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…The bulk, GB, and the total conductivity are maximized at x = 0.15, and the room temperature Fion conductivity of K 0.85 Rb 0.15 SbF 4 were determined to be σ bulk = 1.01 × 10 + doped KSbF 4 showed ionic conductivity of 2.5 × 10 −6 S cm −1 at room temperature. 25 However, it shows one order of magnitude lower ionic conductivity than that of Rb doped KSbF 4 , and therefore Rb + is a promissing dopant to improve Fion conductivity in KSbF 4 . The ionic conductivity drastically decreased in the range of x ⩾ 0.18, induced by the structural transition.…”

Section: Resultsmentioning

confidence: 99%

“…Potassium tetrafluoroantimonate (KSbF 4 ) is a Fion conductive material with a double salt of KF and SbF 3 . [20][21][22][23][24][25][26] When KSbF 4 is annealed just below the melting temperature of 553 K, SbF 3 , whose boiling temperature (649 K) is much lower than that of KF (1778 K), evaporates from KSbF 4 while maintaining the crystal structure. Then a large amount of Fion vacancy is introduced into KSbF 4 , and the Fion conductivity of KSbF 4 reaches the order of 10 −4 S cm −1 even at room temperature.…”

Section: Lists Of Symbolsmentioning

confidence: 99%

“…[27][28][29] The ionic radius of Rb + (148 pm) is 10% larger than that of K + (133 pm), and water-soluble RbF can be doped into KSbF 4 by the aqueous solution process. 25 The oxidationreduction potential of Rb + /Rb (−2.98 V vs H + /H) is as same as that of K + /K (−2.93 V vs H + /H), and therefore considered that Rb doping does not influence the electrochemical and chemical stability of KSbF 4 . It is therefore expected that Fion conductivity could be improved by doping Rb + into KSbF 4 .…”

Section: Lists Of Symbolsmentioning

confidence: 99%

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Fluoride Ion Conductivity of Rb Doped KSbF4

Kawahara

Ishikawa

Shibata

et al. 2023

J. Electrochem. Soc.

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All solid-state fluoride ion batteries are considered to be high energy density and safe energy storage devices. However, the F– ion conductivities of solid electrolytes at room temperature are low (< 10-6 S cm-1), which requires the higher operating temperature of fluoride ion battery such as 420 K or higher. Therefore, the faster F– ion conductors is strongly desired to operate fluoride ion battery at lower or even room temperature. KSbF4 is one of the promising candidates to have a faster F– ion conductivity. To expand F– ion conduction pathways, we doped Rb in KSbF4 and further investigated the compositional dependence of ionic conductivity in K1-xRbxSbF4 system. We found that ionic conductivity strongly depends on the chemical composition and conductivity was maximized at x = 0.15. At room temperature, the F– ion conductivity in the bulk and at the grain boundary of K0.85Rb0.15SbF4 were σbulk = 1.01 × 10-4 S cm-1 and σGB = 4.80 × 10-5 S cm-1, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Lists Of Symbolsmentioning

confidence: 99%

Section: Lists Of Symbolsmentioning

confidence: 99%

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Fluoride Ion Conductivity of Rb Doped KSbF4

Kawahara

Ishikawa

Shibata

et al. 2023

J. Electrochem. Soc.

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“…Up to date, researchers have explored ion-conducting materials with various mobile ions, e.g., H + , Li + , Na + , K + , Ag + , Cu + , F − , and O 2− . [5][6][7][8][9][10][11][12][13] Among them, Ag + and Cu + ion conducting solid electrolytes attract special attention due to their extremely high ionic conductivity (∼ 10 −1 S/cm) at room temperature, for example, MAg 4 I 5 (with M = NH 4 , Na, Rb) [14] and Na-βalumina. [15] The framework crystalline ion conducting materials are polymorphic systems showing significant differences in ion conductivity between polymorphs.…”

Section: Introductionmentioning

confidence: 99%

Copper ion beam emission in solid electrolyte Rb₄Cu₁₆I_6.5Cl_13.5

Abudouwufu¹,

Zhang²,

Zuo³

et al. 2022

Chinese Phys. B

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Copper ion conducting solid electrolyte Rb4Cu16I6.5Cl13.5 was prepared by means of mechano-chemical method. The structure and morphology of the powder was investigated by x-ray diffraction and scanning electron microscopy. The grain size was estimated to be 0.2–0.9 μm and the ionic conductivity at room temperature was approximately 0.206 S/cm. The solid electrolyte Rb4Cu16I6.5Cl13.5 was exploited for copper ion beam generation. The copper ion emission current of several nA was successfully obtained at acceleration voltages of 15 kV and temperature of 197 °C in vacuum of 2.1 × 10−4 Pa. A good linear correlation between the logarithmic ion current (log I) and the square root of the acceleration voltage (U acc) at high voltage range was obtained, suggesting the Schottky emission mechanism in the process of copper ion beam generation.

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